2023A&A...670A.124C

Query : 2023A&A...670A.124C

2023A&A...670A.124C - Astronomy and Astrophysics, volume 670A124 (2023/2-1)

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

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., GURKAN 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. and ZHENG J.

Abstract (from CDS):

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.

Abstract Copyright: © The Authors 2023

Journal keyword(s): surveys - catalogs - radio continuum: general - polarization

VizieR on-line data: <Available at CDS (J/A+A/670/A124): catalog.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PSR B0045+33 Psr 00 48 33.98 +34 12 08.0           ~ 45 0
2 TYC 2834-1385-1 PM* 02 18 26.0343259608 +40 34 06.793152420   12.59 11.68     ~ 2 0
3 PSR B0751+32 Psr 07 54 40.688 +32 31 56.20           ~ 88 0
4 PSR B0823+26 Psr 08 26 51.5068 +26 37 21.297           ~ 541 1
5 PSR B0917+63 Psr 09 21 14.135 +62 54 13.91           ~ 42 0
6 V* W UMa SB* 09 43 45.4704536952 +55 57 09.061630668   8.54 7.75     G2Vn 686 0
7 PSR J1012+5307 Psr 10 12 33.4345449600 +53 07 02.548542576     19.5     DA 419 1
8 V* RS CVn RS* 13 10 36.9077924448 +35 56 05.584994412 8.57 8.51 7.93 7.7   F6IV+G8IV 753 0
9 V* FK Com PM* 13 30 46.7996390256 +24 13 57.781233768   9.04 8.245   7.204 G4III 384 1
10 BD+42 2437 Ro* 13 46 01.4821671456 +42 01 07.921824852   10.18 9.24     G0 10 0
11 SDSS J164033.57+541943.3 QSO 16 40 33.5712297480 +54 19 43.320597636           ~ 14 1
12 V* BY Dra BY* 18 33 55.7720712062 +51 43 08.897780286 10.22 9.23   8.733   K4Ve+K7.5Ve 639 0
13 PSR B2210+29 Psr 22 12 23.3444 +29 33 05.411           ~ 54 0
14 PSR B2315+21 Psr 23 17 57.8419 +21 49 48.019           ~ 119 0
15 HD 220242 PM* 23 21 58.2511522920 +26 36 32.072495976   6.967 6.586     F5V 54 0

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