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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Callingham, J. R.; Shimwell, T. W.; Vedantham, H. K.; Bassa, C. G.; +43 Authors

    The LOFAR data in this manuscript were processed by the LOFAR Two-Metre Sky Survey (LoTSS) team. This team made use of the LOFAR direction-independent calibration pipeline (https://github.com/lofar-astron/prefactor), which was deployed by the LOFAR e-infragroup on the Dutch National Grid infrastructure with support of the SURF Co-operative through grants e-infra 160022 e-infra 160152 (Mechev et al. 2017). The LoTSS direction dependent calibration and imaging pipeline (http://github.com/mhardcastle/ddf-pipeline/) was run on compute clusters at Leiden Observatory and the University of Hertfordshire, which are supported by a European Research Council (ERC) Advanced Grant [NEWCLUSTERS-321271] and the UK Science and Technology Funding Council (STFC) [ST/P000096/1]. The Jülich LOFAR Long Term Archive and the German LOFAR network are both coordinated and operated by the Jülich Supercomputing Centre (JSC), and computing resources on the supercomputer JUWELS at JSC were provided by the Gauss Centre for Supercomputing e.V. (grant CHTB00) through the John von Neumann Institute for Computing (NIC). J.R.C. thanks the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) for support via the Talent Programme Veni grant. H.K. and S.B. acknowledge funding from the NWO for the project e-MAPS (project number Vi.Vidi.203.093) under the NWO talent scheme VIDI. T.W.H.Y. acknowledges funding from EOSC Future (Grant Agreement no. 101017536) projects funded by the European Union’s Horizon 2020 research and innovation programme. P.N.B. is grateful for support from the UK STFC via grant ST/V000594/1. M.J.H. acknowledges support from the UK STFC [ST/V000624/1]. M.H. acknowledges funding from the ERC under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 772663). R.J.v.W. and R.T. acknowledge support from the ERC Starting Grant ClusterWeb 804208. G.J.W. gratefully acknowledges the support of an Emeritus Fellowship from The Leverhulme Trust. D.J.B. acknowledges funding from the German Science Foundation DFG, via the Collaborative Research Center SFB1491 “Cosmic Interacting Matters – From Source to Signal”. A. Bonafede, A. Botteon, D.N.H., and C.J.R. acknowledge support from ERC Stg DRA-NOEL n. 714245 and MIUR FARE grant “SMS”. A.D. acknowledges support by the BMBF Verbundforschung under the grant 05A20STA. K.L.E. is a Jan-sky Fellow of the National Radio Astronomy Observatory. M. Haj and K.C.H. acknowledge the MSHE for granting funds for the Polish contribution to the International LOFAR Telescope (MSHE decision no. DIR/WK/2016/2017/05-1) and for maintenance of the LOFAR PL-612 Baldy (MSHE decision no. 59/E-383/SPUB/SP/2019.1), and LOFAR PL-611 Lazy (MSHE decision no. 46/E-338/SPUB/SP/2019). M.K. acknowledges support from the German Science Foundation DFG, via the Research Unit FOR 5195 “Relativistic Jets in Active Galaxies”. M.K.B. acknowledges support from the National Science Centre, Poland under grant no. 2017/26/E/ST9/00216. B.M. acknowledges support from the UK STFC under grants ST/R00109X/1, ST/R000794/1, and ST/T000295/1. L.K.M. is grateful for support from the UKRI Future Leaders Fellowship (grant MR/T042842/1). D.G.N. acknowledges funding from Conicyt through Fondecyt Postdoctorado (project code 3220195). M.P.T. acknowledges financial support from the Spanish Ministerio de Ciencia e Innovación (MCIN), the Agencia Estatal de Investigación (AEI) through the “Center of Excellence Severo Ochoa” award to the Instituto de Astrofísica de Andalucía (SEV-2017-0709) and through grant PID2020-117404GB-C21 funded by MCIN/AEI/10.13039/501100011033. T.P.R. acknowledges support from the ERC Grant No. 743029 (EASY). A.R. acknowledges funding from the NWO Aspasia grant (number: 015.016.033). M.V. acknowledges financial support from the Inter-University Institute for Data Intensive Astronomy (IDIA), a partnership of the University of Cape Town, the University of Pretoria, the University of the Western Cape and the South African Radio Astronomy Observatory, and from the South African Department of Science and Innovation’s National Research Foundation under the ISARP RADIOSKY2020 Joint Research Scheme (DSI-NRF Grant Number 113121) and the CSUR HIPPO Project (DSI-NRF Grant Number 121291). This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France, and NASA’s Astrophysics Data System. This work has also made use of TOPCAT (Taylor 2005); the IPYTHON package (Pérez & Granger 2007); SciPy (Jones et al. 2001); MATPLOTLIB, a PYTHON library for publication quality graphics (Hunter 2007); ASTROPY, a community-developed core PYTHON package for astronomy (Astropy Collaboration 2013); and NUMPY (Van Der Walt et al. 2011). We present the detection of 68 sources from the most sensitive radio survey in circular polarisation conducted to date. We used the second data release of the 144 MHz LOFAR Two-metre Sky Survey to produce circularly polarised maps with a median noise of 140 µJy beam−1 and resolution of 20″ for ≈27% of the northern sky (5634 deg2). The leakage of total intensity into circular polarisation is measured to be ≈0.06%, and our survey is complete at flux densities ≥1 mJy. A detection is considered reliable when the circularly polarised fraction exceeds 1%. We find the population of circularly polarised sources is composed of four distinct classes: stellar systems, pulsars, active galactic nuclei, and sources unidentified in the literature. The stellar systems can be further separated into chromospherically active stars, M dwarfs, and brown dwarfs. Based on the circularly polarised fraction and lack of an optical counterpart, we show it is possible to infer whether the unidentified sources are likely unknown pulsars or brown dwarfs. By the completion of this survey of the northern sky, we expect to detect 300±100 circularly polarised sources. © The Authors 2023. Full list of authors: Callingham, J. R.; Shimwell, T. W.; Vedantham, H. K.; Bassa, C. G.; O'Sullivan, S. P.; Yiu, T. W. H.; Bloot, S.; Best, P. N.; Hardcastle, M. J.; Haverkorn, M.; Kavanagh, R. D.; Lamy, L.; Pope, B. J. S.; Rottgering, H. J. A.; Schwarz, D. J.; Tasse, C.; van Weeren, R. J.; White, G. J.; Zarka, P.; Bomans, D. J.; Bonafede, A.; Bonato, M.; Botteon, A.; Bruggen, M.; Chyzy, K. T.; Drabent, A.; Emig, K. L.; Gloudemans, A. J.; Guerkan, G.; Hajduk, M.; Hoang, D. N.; Hoeft, M.; Iacobelli, M.; Kadler, M.; Kunert-Bajraszewska, M.; Mingo, B.; Morabito, L. K.; Nair, D. G.; Perez-Torres, M.; Ray, T. P.; Riseley, C. J.; Rowlinson, A.; Shulevski, A.; Sweijen, F.; Timmerman, R.; Vaccari, M.; Zheng, J.-- This is an Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (CEX2021-001131-S). Peer reviewed

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    Durham Research Online
    Article . 2023 . Peer-reviewed
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    NARCIS
    Article . 2023
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    Astronomy and Astrophysics
    Article . 2023
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    Radboud Repository
    Article . 2023
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    https://doi.org/10.48550/arxiv...
    Article . 2022
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      Durham Research Online
      Article . 2023 . Peer-reviewed
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      NARCIS
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      Astronomy and Astrophysics
      Article . 2023
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      Radboud Repository
      Article . 2023
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      https://doi.org/10.48550/arxiv...
      Article . 2022
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    Authors: Gelati, Francesco;

    The European Holocaust Research Infrastructure (EHRI) portal website aims to aggregate digitally available archival descriptions concerning the Holocaust. This portal is actually a meta-catalogue, or an information aggregator, whose biggest goal is to have up-to-date information by means of building sustainable data pipelines between EHRI and its content providers. Just like in similar archival information aggregators (e.g. Archives Portal Europe or Monasterium), the XML-based metadata standard Encoded Archival Description (EAD) plays a key role. The article presents how EADs are imported into the portal, mainly thanks to the Open Archive Initiative protocols.

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    Hal-Diderot
    Other literature type . 2019
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    Part of book or chapter of book . 2019
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    ZENODO
    Part of book or chapter of book . 2019
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      Hal-Diderot
      Other literature type . 2019
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  • Authors: Aquilon, Pierre;

    Dans le cadre de l’École d’été « Bibliotheca Digitalis » trois conférences publiques (en français) ont été organisées à la Médiathèque Louis-Aragon du Mans.; International audience; Les bibliothèques entretiennent certaines ressemblances avec les sites archéologiques. En particulier celles qui possèdent des fonds patrimoniaux. Leur histoire est celle des apports successifs qui les ont constituées. Mon propos sera ici d’examiner, en empruntant mes exemples aux ouvrages imprimés entre 1455 et 1500, les éléments matériels dont les livres sont porteurs, au-delà de leur contenu textuel. Il ne sera donc pas question de leur genèse typographique, mais de toutes les traces d’interventions humaines (reliures, ex-libris, décors, notes manuscrites, cotes…) à partir du moment où les cahiers de l’exemplaire « en blanc » ont quitté la presse.

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  • Authors: Uetani, Toshinori; Greengrass, Mark;

    International audience

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    Authors: Larrousse, Nicolas; Gray, Edward J.; Concordia, Cesare;

    If citation is a common practice for publications, it is relatively new for data especially in SSH. This paper will present the work carried out during the SSHOC project about data citation in general and more precisely how to make them actionable. The metaphor of a travel journal of an expedition seemed appropriate to us to present this work carried out during the SSHOC project. The first part was to study this terra incognita by making an inventory of citation practices (https://doi.org/10.5281/zenodo.3595965). To summarize, we discovered that in the research communities we investigated, practices were seldom standardized and were very diverse, generally producing citations that could not be processed by machines: in other words they were not “actionable”. This led us to develop a sort of guide necessary to journey through this new, uncharted territory in the form of a set of recommendations ( https://doi.org/10.5281/zenodo.5361717) to build citations in SSH. So as not to reinvent the wheel, we based these recommendations on existing principles created by Force11 ( https://doi.org/10.25490/a97f-egyk) by adapting them to the specific characteristics of the SSH data. These recommendations were validated by a committee of experts from different backgrounds and structures (RDA participants, CODATA director, OpenAire Engineers etc.) during a round table (https://www.sshopencloud.eu/news/roundtable-experts-data-citation) and in a parallel review process. Then we decided to analyze the resources available in this new territory, that is, the repositories that are so crucial to be able to cite data. We carried out an analysis of 85 repositories against 7 quality criteria based on the recommendations which ensure continuity with the work mentioned above: PID from “Unique Identification & Persistence” Landing page from “Access” Structured metadata from “Importance & Credit and Attribution” Cite as from “Evidence, Specificity & Verifiability” Versioning from “Specificity and Verifiability” Standardized vocabularies from “Interoperability and Flexibility” Links to publications from “Importance” The results of this survey (https://doi.org/10.5281/zenodo.5603306) are encouraging - even if there is room for improvement, particularly in the use of Persistent Identifiers. Importantly, the presence of a landing page in almost all cases allowed us to build up a test sample made up of a very diverse dataset from those repositories for which we want to build standardized and actionable citations. In parallel we developed a tool in order to “harvest” the resources found in this new land so as to better understand them and also be able to explain them to others. We developed a prototype composed of three components: a harvester which grabs information about a dataset and normalizes it an API to disseminate the metadata of the citation thereby making it actionable a citation viewer for human purposes For the first iteration to populate this prototype, we used the dataset collected during our survey of repositories and we are going to gradually add more datasets from various sources. This prototype is primarily designed to implement what we called “actionability” to a citation and provide a ready-to-use citation in various citation formats. Starting from the PID of a dataset, the prototype attempts to aggregate metadata from different sources: the repository of the dataset, the PID Registration Agency and a number of Knowledge Graphs. For instance, while metadata associated with a DOI (Digital Object Identifier) are limited and those provided by a handle are even more scarce, it is possible to get more information from a landing page and thus enrich the citation. We also used another indirect approach to gather additional information by using a registry of repositories (RE3Data https://www.re3data.org/) which provides, among other things, information on the available APIs available for a specific repository. Thus the prototype can give a unified view of information about datasets coming from different sources. For researchers, it thus avoids cumbersome work on how to cite a dataset or get information about its provenance. In return, it makes a researcher aware of the importance of properly documenting a dataset and depositing it in a “good” repository. This paper will present in greater detail what we learned at each step of this expedition and how a research project can take advantage of a good citation system to enhance the visibility of the output. We will also introduce the potential uses based on the information provided by the prototype such as the possibility of associating a specific tool to process data or the use of this information as a base to build data papers.

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  • Authors: Jimenes, Rémi;

    International audience; Bibliographic data can be produced by different kind of people, responding to different purposes. An author can provide information about the origin of a quotation; a bookseller can offer the reader a catalogue of his supply; a printer handles the exact accounts of his stock; a librarian needs a file showing the precise location of a specific copy… From archives to printed books, we will try to give an overview of the different sources which can provide bibliographic data.

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    Authors: Raciti, Marco; Gabay, Simon; Moranville, Yoann; Jorge, Maria Do Rosário; +1 Authors

    International audience; Europe has a long and rich tradition as a centre of research and teaching in the arts and humanities. However, the huge digital transformation that affects the arts and humanities research landscape all over the world requires that we set up sustainable research infrastructures, new and refined techniques, state-of-the-art methods and an expanded skills base. Responding to these challenges, the Digital Research Infrastructure for Arts and Humanities (DARIAH) was launched as a pan-European network and research infrastructure. After expansion and consolidation, which involved DARIAH’s inclusion in the ESFRI roadmap, DARIAH became a European Research Infrastructure Consortium (ERIC) in 2014. The Horizon 2020 funded project DESIR (DARIAH ERIC Sustainability Refined) sets out to strengthen the sustainability of DARIAH and help establish it as a reliable long-term partner within our communities. Sustaining existing digital expertise, tools, resources in Europe in the context of DESIR involves a goal-oriented set of measures in order to first, maintain, expand and develop DARIAH in its capacities as an organisation and technical research infrastructure; secondly, to engage its members further, as well as measure and increase their trust in DARIAH; thirdly, to expand the network in order to integrate new regions and communities. The DESIR consortium is composed of core DARIAH members, representatives from potential new DARIAH members and external technical experts. The sustainability of a research infrastructure is the capacity to remain operative, effective and competitive over its expected lifetime. In DESIR, this definition is translated into an evolving 6-dimensional process, divided into the following challenges:•Dissemination•Growth•Technology•Robustness•Trust•EducationWith our poster, we would like to show how the project helps sustaining DARIAH. Within DESIR, dissemination is the ability to communicate DARIAH’s strategy and benefits effectively within the DARIAH community and in new areas, spreading out to new communities. Through the international workshops held at Stanford University and at the Library of Congress, DARIAH has been introduced to many non-European DH scholars. These events were an important first step to foster international cooperation between US and European colleagues as well as a catalyst for ongoing collaborations in the future. A third workshop took place in Canberra at the Australian Research Data Commons in March 2019.DARIAH has currently 17 members from all over Europe. Nevertheless, efforts should be made to include as many countries as possible to bring in and scale, to a European level, even more state-of-the-art DH activities.Six candidates ready for building strong national consortia have been identified, enabling a substantial expansion of DARIAH’s country coverage. Additionally, thematic workshops are organised in each country as well as tailored training measures.DESIR widens the research infrastructure in core areas which are vital for DARIAH’s sustainability but are not yet covered by the existing set-up. As DARIAH expands across Europe, continuously enhancing and further developing the ERIC exceeds DARIAH’s internal technological capacities. Two notable results were achieved so far: firstly, the publication of a technical reference as a result of a workshop organised in October 2017 with CESSDA and CLARIN. It’s a collection of basic guidelines and references for development and maintenance of infrastructure services within DARIAH and beyond, addressing an ongoing issue for research infrastructures, namely software sustainability. Secondly, the organisation of a Code Sprint, focusing on bibliographical and citation metadata, which helped shaping DARIAH’s profile in four technology areas (visualisation, text analytic services, entity-based search and scholarly content management). Another Code sprint is expected to take place in Summer 2019.Another output is the implementation of a centralized helpdesk. This helpdesk is hosted by CLARIN-D and the solution of integration within the existing DARIAH website was the creation of a WordPress plugin. This plugin is used to connect our website with the OTRS server and allows the creation of issues easily by users unfamiliar with OTRS.Sustaining a research infrastructure involves also two important aspects: trust and education. For DARIAH, it is crucial to increase trust and confidence from its users. In DESIR we develop recommendations and strategies accordingly, targeting new cross-disciplinary communities, based on the results of a survey and interviews addressed to the scientific community, with different levels of approach - national, institutional and individual.In addition, education is a key area and the project contributes to the ongoing discussions about the role and modalities of training and education in the development, consolidation and sustainability of digital research infrastructures. We believe that investing time and efforts into training and educating users is a way of securing the social sustainability of a research infrastructure.

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  • Authors: Riondet, Charles; Romary, Laurent;

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    Authors: Scharnhorst, Andrea; Admiraal, Femmy; van Kranenburg, Peter; Guillotel-Nothmann, Christophe; +1 Authors

    This paper takes as an example the envisioned portal of the newly started Polifonia project that interlinks resources from very rich, old, established archives while making optimal use of the latest semantic web technologies. In the project, ten research pilots, spanning from historical bells and organ heritage, classification of polyphonic notated music, to the historical role of music in children's lives, form the driving force behind the development of the dedicated interface. Based on a mixture of participation and participatory observation, we describe and reflect on the processes involved in making the portal. In other words - exemplified with the case of Polifonia - we reflect on the role of interfaces (of various types, shapes, manifestations and/or durations) to organise knowledge in an interdisciplinary project. In particular, we focus on the role of data management within the project as a key component of research methodology and cross-disciplinary collaboration, rather than an administrative exercise. The knowledge generated by this part of the project serves at least three different purposes: (1) to envision new research questions (competence questions) guiding the engineering backbone processes; (2) to define the future elements of the portal both for experts, other researchers, wider public and specific parts of the wider public; and last but not least, (3) the documentation task needed to support reproducibility and FAIRness of all data processes. Figure 1 below illustrates how the three components, namely the sociotechnical roadmap of the portal, the ontology-based knowledge graphs created in the research pilots, and the data management plan form three complementary components of the Polifonia project, that ultimately all feed into the web portal. In this paper, we claim that behind any interface there is the need for a layer of interfaces that form the basis of the final interface visible to the public. These procedural, intermediary, interfaces take the form of meetings, shared notes, github presence - and will result in products of their own (Data Management Plan, knowledge graphs), as well as inform the decisions during the process of designing the portal.

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  • Authors: Romary, Laurent; Biabiany, Damien; Illmayer, Klaus; Puren, Marie; +3 Authors

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23 Research products
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    Authors: Callingham, J. R.; Shimwell, T. W.; Vedantham, H. K.; Bassa, C. G.; +43 Authors

    The LOFAR data in this manuscript were processed by the LOFAR Two-Metre Sky Survey (LoTSS) team. This team made use of the LOFAR direction-independent calibration pipeline (https://github.com/lofar-astron/prefactor), which was deployed by the LOFAR e-infragroup on the Dutch National Grid infrastructure with support of the SURF Co-operative through grants e-infra 160022 e-infra 160152 (Mechev et al. 2017). The LoTSS direction dependent calibration and imaging pipeline (http://github.com/mhardcastle/ddf-pipeline/) was run on compute clusters at Leiden Observatory and the University of Hertfordshire, which are supported by a European Research Council (ERC) Advanced Grant [NEWCLUSTERS-321271] and the UK Science and Technology Funding Council (STFC) [ST/P000096/1]. The Jülich LOFAR Long Term Archive and the German LOFAR network are both coordinated and operated by the Jülich Supercomputing Centre (JSC), and computing resources on the supercomputer JUWELS at JSC were provided by the Gauss Centre for Supercomputing e.V. (grant CHTB00) through the John von Neumann Institute for Computing (NIC). J.R.C. thanks the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) for support via the Talent Programme Veni grant. H.K. and S.B. acknowledge funding from the NWO for the project e-MAPS (project number Vi.Vidi.203.093) under the NWO talent scheme VIDI. T.W.H.Y. acknowledges funding from EOSC Future (Grant Agreement no. 101017536) projects funded by the European Union’s Horizon 2020 research and innovation programme. P.N.B. is grateful for support from the UK STFC via grant ST/V000594/1. M.J.H. acknowledges support from the UK STFC [ST/V000624/1]. M.H. acknowledges funding from the ERC under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 772663). R.J.v.W. and R.T. acknowledge support from the ERC Starting Grant ClusterWeb 804208. G.J.W. gratefully acknowledges the support of an Emeritus Fellowship from The Leverhulme Trust. D.J.B. acknowledges funding from the German Science Foundation DFG, via the Collaborative Research Center SFB1491 “Cosmic Interacting Matters – From Source to Signal”. A. Bonafede, A. Botteon, D.N.H., and C.J.R. acknowledge support from ERC Stg DRA-NOEL n. 714245 and MIUR FARE grant “SMS”. A.D. acknowledges support by the BMBF Verbundforschung under the grant 05A20STA. K.L.E. is a Jan-sky Fellow of the National Radio Astronomy Observatory. M. Haj and K.C.H. acknowledge the MSHE for granting funds for the Polish contribution to the International LOFAR Telescope (MSHE decision no. DIR/WK/2016/2017/05-1) and for maintenance of the LOFAR PL-612 Baldy (MSHE decision no. 59/E-383/SPUB/SP/2019.1), and LOFAR PL-611 Lazy (MSHE decision no. 46/E-338/SPUB/SP/2019). M.K. acknowledges support from the German Science Foundation DFG, via the Research Unit FOR 5195 “Relativistic Jets in Active Galaxies”. M.K.B. acknowledges support from the National Science Centre, Poland under grant no. 2017/26/E/ST9/00216. B.M. acknowledges support from the UK STFC under grants ST/R00109X/1, ST/R000794/1, and ST/T000295/1. L.K.M. is grateful for support from the UKRI Future Leaders Fellowship (grant MR/T042842/1). D.G.N. acknowledges funding from Conicyt through Fondecyt Postdoctorado (project code 3220195). M.P.T. acknowledges financial support from the Spanish Ministerio de Ciencia e Innovación (MCIN), the Agencia Estatal de Investigación (AEI) through the “Center of Excellence Severo Ochoa” award to the Instituto de Astrofísica de Andalucía (SEV-2017-0709) and through grant PID2020-117404GB-C21 funded by MCIN/AEI/10.13039/501100011033. T.P.R. acknowledges support from the ERC Grant No. 743029 (EASY). A.R. acknowledges funding from the NWO Aspasia grant (number: 015.016.033). M.V. acknowledges financial support from the Inter-University Institute for Data Intensive Astronomy (IDIA), a partnership of the University of Cape Town, the University of Pretoria, the University of the Western Cape and the South African Radio Astronomy Observatory, and from the South African Department of Science and Innovation’s National Research Foundation under the ISARP RADIOSKY2020 Joint Research Scheme (DSI-NRF Grant Number 113121) and the CSUR HIPPO Project (DSI-NRF Grant Number 121291). This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France, and NASA’s Astrophysics Data System. This work has also made use of TOPCAT (Taylor 2005); the IPYTHON package (Pérez & Granger 2007); SciPy (Jones et al. 2001); MATPLOTLIB, a PYTHON library for publication quality graphics (Hunter 2007); ASTROPY, a community-developed core PYTHON package for astronomy (Astropy Collaboration 2013); and NUMPY (Van Der Walt et al. 2011). We present the detection of 68 sources from the most sensitive radio survey in circular polarisation conducted to date. We used the second data release of the 144 MHz LOFAR Two-metre Sky Survey to produce circularly polarised maps with a median noise of 140 µJy beam−1 and resolution of 20″ for ≈27% of the northern sky (5634 deg2). The leakage of total intensity into circular polarisation is measured to be ≈0.06%, and our survey is complete at flux densities ≥1 mJy. A detection is considered reliable when the circularly polarised fraction exceeds 1%. We find the population of circularly polarised sources is composed of four distinct classes: stellar systems, pulsars, active galactic nuclei, and sources unidentified in the literature. The stellar systems can be further separated into chromospherically active stars, M dwarfs, and brown dwarfs. Based on the circularly polarised fraction and lack of an optical counterpart, we show it is possible to infer whether the unidentified sources are likely unknown pulsars or brown dwarfs. By the completion of this survey of the northern sky, we expect to detect 300±100 circularly polarised sources. © The Authors 2023. Full list of authors: Callingham, J. R.; Shimwell, T. W.; Vedantham, H. K.; Bassa, C. G.; O'Sullivan, S. P.; Yiu, T. W. H.; Bloot, S.; Best, P. N.; Hardcastle, M. J.; Haverkorn, M.; Kavanagh, R. D.; Lamy, L.; Pope, B. J. S.; Rottgering, H. J. A.; Schwarz, D. J.; Tasse, C.; van Weeren, R. J.; White, G. J.; Zarka, P.; Bomans, D. J.; Bonafede, A.; Bonato, M.; Botteon, A.; Bruggen, M.; Chyzy, K. T.; Drabent, A.; Emig, K. L.; Gloudemans, A. J.; Guerkan, G.; Hajduk, M.; Hoang, D. N.; Hoeft, M.; Iacobelli, M.; Kadler, M.; Kunert-Bajraszewska, M.; Mingo, B.; Morabito, L. K.; Nair, D. G.; Perez-Torres, M.; Ray, T. P.; Riseley, C. J.; Rowlinson, A.; Shulevski, A.; Sweijen, F.; Timmerman, R.; Vaccari, M.; Zheng, J.-- This is an Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (CEX2021-001131-S). Peer reviewed

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    Durham Research Online
    Article . 2023 . Peer-reviewed
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    NARCIS
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    Astronomy and Astrophysics
    Article . 2023
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    Radboud Repository
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    https://doi.org/10.48550/arxiv...
    Article . 2022
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      Durham Research Online
      Article . 2023 . Peer-reviewed
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      Astronomy and Astrophysics
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      Radboud Repository
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      https://doi.org/10.48550/arxiv...
      Article . 2022
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      Data sources: Datacite
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    Authors: Gelati, Francesco;

    The European Holocaust Research Infrastructure (EHRI) portal website aims to aggregate digitally available archival descriptions concerning the Holocaust. This portal is actually a meta-catalogue, or an information aggregator, whose biggest goal is to have up-to-date information by means of building sustainable data pipelines between EHRI and its content providers. Just like in similar archival information aggregators (e.g. Archives Portal Europe or Monasterium), the XML-based metadata standard Encoded Archival Description (EAD) plays a key role. The article presents how EADs are imported into the portal, mainly thanks to the Open Archive Initiative protocols.

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    Hal-Diderot
    Other literature type . 2019
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    ZENODO
    Part of book or chapter of book . 2019
    License: CC BY
    Data sources: ZENODO
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    ZENODO
    Part of book or chapter of book . 2019
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    Data sources: Datacite
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      Hal-Diderot
      Other literature type . 2019
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      ZENODO
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  • Authors: Aquilon, Pierre;