2019A&A...622A...1S

Query : 2019A&A...622A...1S

2019A&A...622A...1S - Astronomy and Astrophysics, volume 622A1-1 (2019/2-1)

The LOFAR Two-metre Sky Survey. II. First data release.

SHIMWELL T.W., TASSE C., HARDCASTLE M.J., MECHEV A.P., WILLIAMS W.L., BEST P.N., ROTTGERING H.J.A., CALLINGHAM J.R., DIJKEMA T.J., DE GASPERIN F., HOANG D.N., HUGO B., MIRMONT M., OONK J.B.R., PRANDONI I., RAFFERTY D., SABATER J., SMIRNOV O., VAN WEEREN R.J., WHITE G.J., ATEMKENG M., BESTER L., BONNASSIEUX E., BRUGGEN M., BRUNETTI G., CHYZY K.T., COCHRANE R., CONWAY J.E., CROSTON J.H., DANEZI A., DUNCAN K., HAVERKORN M., HEALD G.H., IACOBELLI M., INTEMA H.T., JACKSON N., JAMROZY M., JARVIS M.J., LAKHOO R., MEVIUS M., MILEY G.K., MORABITO L., MORGANTI R., NISBET D., ORRU E., PERKINS S., PIZZO R.F., SCHRIJVERS C., SMITH D.J.B., VERMEULEN R., WISE M.W., ALEGRE L., BACON D.J., VAN BEMMEL I.M., BESWICK R.J., BONAFEDE A., BOTTEON A., BOURKE S., BRIENZA M., CALISTRO RIVERA G., CASSANO R., CLARKE A.O., CONSELICE C.J., DETTMAR R.J., DRABENT A., DUMBA C., EMIG K.L., ENSSLIN T.A., FERRARI C., GARRETT M.A., GENOVA-SANTOS R.T., GOYAL A., GURKAN G., HALE C., HARWOOD J.J., HEESEN V., HOEFT M., HORELLOU C., JACKSON C., KOKOTANEKOV G., KONDAPALLY R., KUNERT-BAJRASZEWSKA M., MAHATMA V., MAHONY E.K., MANDAL S., McKEAN J.P., MERLONI A., MINGO B., MISKOLCZI A., MOONEY S., NIKIEL-WROCZYNSKI B., O'SULLIVAN S.P., QUINN J., REICH W., ROSKOWINSKI C., ROWLINSON A., SAVINI F., SAXENA A., SCHWARZ D.J., SHULEVSKI A., SRIDHAR S.S., STACEY H.R., URQUHART S., VAN DER WIEL M.H.D., VARENIUS E., WEBSTER B. and WILBER A.

Abstract (from CDS):

The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120-168 MHz survey of the entire northern sky for which observations are now 20% complete. We present our first full-quality public data release. For this data release 424 square degrees, or 2% of the eventual coverage, in the region of the HETDEX Spring Field (right ascension 10h45m00s to 15h30m00s and declination 45°00'00'' to 57°00'00'') were mapped using a fully automated direction-dependent calibration and imaging pipeline that we developed. A total of 325694 sources are detected with a signal of at least five times the noise, and the source density is a factor of ∼10 higher than the most sensitive existing very wide-area radio-continuum surveys. The median sensitivity is S144MHz=71µJy/beam and the point-source completeness is 90% at an integrated flux density of 0.45mJy. The resolution of the images is 6'' and the positional accuracy is within 0.2''. This data release consists of a catalogue containing location, flux, and shape estimates together with 58 mosaic images that cover the catalogued area. In this paper we provide an overview of the data release with a focus on the processing of the LOFAR data and the characteristics of the resulting images. In two accompanying papers we provide the radio source associations and deblending and, where possible, the optical identifications of the radio sources together with the photometric redshifts and properties of the host galaxies. These data release papers are published together with a further ∼20 articles that highlight the scientific potential of LoTSS.

Abstract Copyright: © ESO 2019

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

VizieR on-line data: <Available at CDS (J/A+A/622/A1): lotssdr1.dat>

Nomenclature: ILT JHHMMSS.ss+DDMMSS.s N=325694.

Simbad objects: 6

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Number of rows : 6
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 3C 196 Sy1 08 13 36.0561170112 +48 13 02.644966020   18.36 17.79     ~ 578 2
2 ACO 1314 ClG 11 34 53.0 +49 05 18           ~ 234 1
3 NGC 4217 GiG 12 15 50.900 +47 05 30.44   12.4       ~ 324 2
4 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2512 4
5 7C 125441.29+473632.00 SyG 12 56 57.485 +47 20 20.23   22.0       ~ 285 1
6 3C 295 Sy1 14 11 20.6 +52 12 09   22.34 20.80 18.54   ~ 1021 4

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