V-LoTSS: The circularly polarised LOFAR Two-metre Sky Survey

Article


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., 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., Ray T.P., Riseley C.J., Rowlinson A., Shulevski A., Sweijen F., Timmerman R., Vaccari M., Zheng J., Callingham, J.R., Shimwell, T.W., Vedantham, H.K., Bassa, C.G., O’Sullivan, S.P., Yiu, T.W., Bloot, S., Best, P.N., Hardcastle, M.J., Haverkorn, M., Kavanagh, R.D., Lamy, L., Pope, B. J. S., Röttgering, H., Schwarz, D.J., Tasse, C., van Werren, R.J., White, G.J., ..., Hajduk, M.. 2023. "V-LoTSS: The circularly polarised LOFAR Two-metre Sky Survey." Astronomy and Astrophysics: a European journal. 670. https://doi.org/10.1051/0004-6361/202245567
Article Title

V-LoTSS: The circularly polarised LOFAR Two-metre Sky Survey

ERA Journal ID1050
Article CategoryArticle
AuthorsCallingham 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., 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., Ray T.P., Riseley C.J., Rowlinson A., Shulevski A., Sweijen F., Timmerman R., Vaccari M., Zheng J., Callingham, J.R., Shimwell, T.W., Vedantham, H.K., Bassa, C.G., O’Sullivan, S.P., Yiu, T.W., Bloot, S., Best, P.N., Hardcastle, M.J., Haverkorn, M., Kavanagh, R.D., Lamy, L., Pope, B. J. S., Röttgering, H., Schwarz, D.J., Tasse, C., van Werren, R.J., White, G.J., Zarka, P., Bomans, D.J., Bonafede, A., M.Bonato, Botteon, A., Bruggen, M., Chyży, K.T., Drabent, A., Emig, K., Gloudemans, A.J., Kavuran, G. and Hajduk, M.
Journal TitleAstronomy and Astrophysics: a European journal
Journal Citation670
Article NumberA124
Number of Pages15
Year2023
PublisherEDP Sciences
Place of PublicationFrance
ISSN0004-6361
1432-0746
Digital Object Identifier (DOI)https://doi.org/10.1051/0004-6361/202245567
Web Address (URL)https://www.aanda.org/articles/aa/abs/2023/02/aa45567-22/aa45567-22.html
AbstractWe 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 beam1 and resolution of 203 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. © 2023 The Authors.
KeywordsCatalogs
ANZSRC Field of Research 20205101. Astronomical sciences
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