125260 20241125101136.0 doi 10.1051/0004-6361/202245567 sideral 133039 ART-2023-133039 eng Callingham, J. R. V-LoTSS: The circularly polarised LOFAR Two-metre Sky Survey 2023 Access copy available to the general public Unrestricted 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. info:eu-repo/grantAgreement/EC/H2020/101017536/EU/EOSC Future/EOSC Future This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 101017536-EOSC Future info:eu-repo/grantAgreement/EC/H2020/743029/EU/Ejection Accretion Structures in YSOs (EASY)/EASY This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 743029-EASY info:eu-repo/grantAgreement/EC/H2020/772663/EU/The MAgnetic field in the GALaxy, using Optical Polarization of Stars/MAGALOPS This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 772663-MAGALOPS info:eu-repo/grantAgreement/ES/MICINN/PID2020-117404GB-C21 info:eu-repo/grantAgreement/ES/MINECO/SEV-2017-0709 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 5.4 2023 ASTRONOMY & ASTROPHYSICS 11 / 84 = 0.131 2023 Q1 T1 1.896 2023 Space and Planetary Science 2023 Q1 Astronomy and Astrophysics 2023 Q1 10.2 2023 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 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. Röttgering, 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. Gürkan, G. Hajduk, M. Hoang, D. N. Hoeft, M. Iacobelli, M. Kadler, M. Kunert-Bajraszewska, M. Mingo, B. Morabito, L. K. Nair, D. G. Pérez-Torres, M. (orcid)0000-0001-5654-0266 Ray, T. P. Riseley, C. J. Rowlinson, A. Shulevski, A. Sweijen, F. Timmerman, R. Vaccari, M. Zheng, J. 670 (2023), A124 [15 pp.] Astron. astrophys. Astronomy and Astrophysics 0004-6361 6257377 http://zaguan.unizar.es/record/125260/files/texto_completo.pdf Versión publicada 3753331 http://zaguan.unizar.es/record/125260/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:125260 articulos driver 2024-11-22-12:00:51 ARTICLE