2022A&A...659A...1S

Query : 2022A&A...659A...1S

2022A&A...659A...1S - Astronomy and Astrophysics, volume 659A1-1 (2022/3-1)

The LOFAR Two-metre Sky Survey. V. Second data release.

SHIMWELL T.W., HARDCASTLE M.J., TASSE C., BEST P.N., ROTTGERING H.J.A., WILLIAMS W.L., BOTTEON A., DRABENT A., MECHEV A., SHULEVSKI A., VAN WEEREN R.J., BESTER L., BRUGGEN M., BRUNETTI G., CALLINGHAM J.R., CHYZY K.T., CONWAY J.E., DIJKEMA T.J., DUNCAN K., DE GASPERIN F., HALE C.L., HAVERKORN M., HUGO B., JACKSON N., MEVIUS M., MILEY G.K., MORABITO L.K., MORGANTI R., OFFRINGA A., OONK J.B.R., RAFFERTY D., SABATER J., SMITH D.J.B., SCHWARZ D.J., SMIRNOV O., O'SULLIVAN S.P., VEDANTHAM H., WHITE G.J., ALBERT J.G., ALEGRE L., ASABERE B., BACON D.J., BONAFEDE A., BONNASSIEUX E., BRIENZA M., BILICKI M., BONATO M., CALISTRO RIVERA G., CASSANO R., COCHRANE R., CROSTON J.H., CUCITI V., DALLACASA D., DANEZI A., DETTMAR R.J., DI GENNARO G., EDLER H.W., ENSSLIN T.A., EMIG K.L., FRANZEN T.M.O., GARCIA-VERGARA C., GRANGE Y.G., GURKAN G., HAJDUK M., HEALD G., HEESEN V., HOANG D.N., HOEFT M., HORELLOU C., IACOBELLI M., JAMROZY M., JELIC V., KONDAPALLY R., KUKRETI P., KUNERT-BAJRASZEWSKA M., MAGLIOCCHETTI M., MAHATMA V., MALEK K., MANDAL S., MASSARO F., MEYER-ZHAO Z., MINGO B., MOSTERT R.I.J., NAIR D.G., NAKONECZNY S.J., NIKIEL-WROCZYNSKI B., ORRU E., PAJDOSZ-SMIERCIAK U., PASINI T., PRANDONI I., VAN PIGGELEN H.E., RAJPUROHIT K., RETANA-MONTENEGRO E., RISELEY C.J., ROWLINSON A., SAXENA A., SCHRIJVERS C., SWEIJEN F., SIEWERT T.M., TIMMERMAN R., VACCARI M., VINK J., WEST J.L., WOLOWSKA A., ZHANG X. and ZHENG J.

Abstract (from CDS):

In this data release from the ongoing LOw-Frequency ARray (LOFAR) Two-metre Sky Survey we present 120-168 MHz images covering 27% of the northern sky. Our coverage is split into two regions centred at approximately 12h45m +44°30' and 1h00m +28°00' and spanning 4178 and 1457 square degrees respectively. The images were derived from 3451 h (7.6 PB) of LOFAR High Band Antenna data which were corrected for the direction-independent instrumental properties as well as direction-dependent ionospheric distortions during extensive, but fully automated, data processing. A catalogue of 4 396 228 radio sources is derived from our total intensity (Stokes I) maps, where the majority of these have never been detected at radio wavelengths before. At 6'' resolution, our full bandwidth Stokes I continuum maps with a central frequency of 144 MHz have: a median rms sensitivity of 83 µJy beam–1; a flux density scale accuracy of approximately 10%; an astrometric accuracy of 0.2''; and we estimate the point-source completeness to be 90% at a peak brightness of 0.8 mJy beam–1. By creating three 16 MHz bandwidth images across the band we are able to measure the in-band spectral index of many sources, albeit with an error on the derived spectral index of > ± 0.2 which is a consequence of our flux-density scale accuracy and small fractional bandwidth. Our circular polarisation (Stokes V) 20'' resolution 120-168 MHz continuum images have a median rms sensitivity of 95 µJy beam–1, and we estimate a Stokes I to Stokes V leakage of 0.056%. Our linear polarisation (Stokes Q and Stokes U) image cubes consist of 480 x 97.6 kHz wide planes and have a median rms sensitivity per plane of 10.8 mJy beam–1 at 4' and 2.2 mJy beam–1 at 20''; we estimate the Stokes I to Stokes Q/U leakage to be approximately 0.2%. Here we characterise and publicly release our Stokes I, Q, U and V images in addition to the calibrated uv-data to facilitate the thorough scientific exploitation of this unique dataset.

Abstract Copyright: © ESO 2022

Journal keyword(s): surveys - catalogs - radio continuum: general - techniques: image processing

VizieR on-line data: <Available at CDS (J/A+A/659/A1): catalog.dat>

Nomenclature: ILT JHHMMSS.s+DDMMSS.s N=4396228.

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

Simbad objects: 23

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Number of rows : 23
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 NGC 315 LIN 00 57 48.88334410 +30 21 08.8119345 12.80 12.20 11.16 11.26   ~ 869 2
2 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
3 SNR G132.6+01.5 SNR 02 17 40 +62 45.0           ~ 193 0
4 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
5 NAME Heart Nebula HII 02 32.7 +61 27           ~ 336 1
6 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 420 0
7 3C 196 Sy1 08 13 36.0561170112 +48 13 02.644966020   18.36 17.79     ~ 578 2
8 ACO 746 ClG 09 09 34.7638 +51 32 56.134           ~ 55 0
9 IC 2476 LIN 09 27 52.8290410824 +29 59 08.744484660   14.5       ~ 100 0
10 BD+44 2051 PM* 11 05 28.5769490063 +43 31 36.386948721 11.440 10.270   7.9   M1.0V 368 0
11 NVSS J114649+352829 rG 11 46 49.39766 +35 28 28.5790           ~ 9 1
12 Z 186-48 BLL 11 47 22.1297825184 +35 01 07.538786184   17.89 16.83 10.26   ~ 184 1
13 G 122-49 PM* 11 50 57.7205259231 +48 22 38.561183125       12.95   M4.5V 176 0
14 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
15 NGC 4631 GiC 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 1154 3
16 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1274 0
17 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
18 NGC 5127 LIN 13 23 45.0315298080 +31 33 56.527040808   13.9       ~ 183 0
19 NAME CrB Supercluster SCG 15 25 +29.5           ~ 148 0
20 ELAIS N1 reg 16 10 01 +54 30.6           ~ 489 0
21 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
22 NAME NEP reg 18 00 00.000 +66 33 38.55           ~ 430 0
23 NAME Cyg Loop SNR 20 51.0 +30 40           ~ 964 0

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