2015A&A...582A.123H

Query : 2015A&A...582A.123H

2015A&A...582A.123H - Astronomy and Astrophysics, volume 582A123-123 (2015/10-1)

The LOFAR Multifrequency Snapshot Sky Survey (MSSS). I. Survey description and first results.

HEALD G.H., PIZZO R.F., ORRU E., BRETON R.P., CARBONE D., FERRARI C., HARDCASTLE M.J., JURUSIK W., MACARIO G., MULCAHY D., RAFFERTY D., ASGEKAR A., BRENTJENS M., FALLOWS R.A., FRIESWIJK W., TORIBIO M.C., ADEBAHR B., ARTS M., BELL M.R., BONAFEDE A., BRAY J., BRODERICK J., CANTWELL T., CARROLL P., CENDES Y., CLARKE A.O., CROSTON J., DAIBOO S., DE GASPERIN F., GREGSON J., HARWOOD J., HASSALL T., HEESEN V., HORNEFFER A., VAN DER HORST A.J., IACOBELLI M., JELIC V., JONES D., KANT D., KOKOTANEKOV G., MARTIN P., McKEAN J.P., MORABITO L.K., NIKIEL-WROCZYNSKI B., OFFRINGA A., PANDEY V.N., PANDEY-POMMIER M., PIETKA M., PRATLEY L., RISELEY C., ROWLINSON A., SABATER J., SCAIFE A.M.M., SCHEERS L.H.A., SENDLINGER K., SHULEVSKI A., SIPIOR M., SOBEY C., STEWART A.J., STROE A., SWINBANK J., TASSE C., TRUESTEDT J., VARENIUS E., VAN VELZEN S., VILCHEZ N., VAN WEEREN R.J., WIJNHOLDS S., WILLIAMS W.L., DE BRUYN A.G., NIJBOER R., WISE M., ALEXOV A., ANDERSON J., AVRUCH I.M., BECK R., BELL M.E., VAN BEMMEL I., BENTUM M.J., BERNARDI G., BEST P., BREITLING F., BROUW W.N., BRUEGGEN M., BUTCHER H.R., CIARDI B., CONWAY J.E., DE GEUS E., DE JONG A., DE VOS M., DELLER A., DETTMAR R.-J., DUSCHA S., EISLOEFFEL J., ENGELS D., FALCKE H., FENDER R., GARRETT M.A., GRIESSMEIER J., GUNST A.W., HAMAKER J.P., HESSELS J.W.T., HOEFT M., HOERANDEL J., HOLTIES H.A., INTEMA H., JACKSON N.J., JUETTE E., KARASTERGIOU A., KLIJN W.F.A., KONDRATIEV V.I., KOOPMANS L.V.E., KUNIYOSHI M., KUPER G., LAW C., VAN LEEUWEN J., LOOSE M., MAAT P., MARKOFF S., McFADDEN R., McKAY-BUKOWSKI D., MEVIUS M., MILLER-JONES J.C.A., MORGANTI R., MUNK H., NELLES A., NOORDAM J.E., NORDEN M.J., PAAS H., POLATIDIS A.G., REICH W., RENTING A., ROETTGERING H., SCHOENMAKERS A., SCHWARZ D., SLUMAN J., SMIRNOV O., STAPPERS B.W., STEINMETZ M., TAGGER M., TANG Y., TER VEEN S., THOUDAM S., VERMEULEN R., VOCKS C., VOGT C., WIJERS R.A.M.J., WUCKNITZ O., YATAWATTA S. and ZARKA P.

Abstract (from CDS):

We present the Multifrequency Snapshot Sky Survey (MSSS), the first northern-sky Low Frequency Array (LOFAR) imaging survey. In this introductory paper, we first describe in detail the motivation and design of the survey. Compared to previous radio surveys, MSSS is exceptional due to its intrinsic multifrequency nature providing information about the spectral properties of the detected sources over more than two octaves (from 30 to 160MHz). The broadband frequency coverage, together with the fast survey speed generated by LOFAR's multibeaming capabilities, make MSSS the first survey of the sort anticipated to be carried out with the forthcoming Square Kilometre Array (SKA). Two of the sixteen frequency bands included in the survey were chosen to exactly overlap the frequency coverage of large-area Very Large Array (VLA) and Giant Metrewave Radio Telescope (GMRT) surveys at 74MHz and 151MHz respectively. The survey performance is illustrated within the MSSS Verification Field (MVF), a region of 100 square degrees centered at (α,δ)J2000=(15h,69°). The MSSS results from the MVF are compared with previous radio survey catalogs. We assess the flux and astrometric uncertainties in the catalog, as well as the completeness and reliability considering our source finding strategy. We determine the 90% completeness levels within the MVF to be 100mJy at 135MHz with 108" resolution, and 550mJy at 50MHz with 166" resolution. Images and catalogs for the full survey, expected to contain 150000-200000 sources, will be released to a public web server. We outline the plans for the ongoing production of the final survey products, and the ultimate public release of images and source catalogs.

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

Simbad objects: 14

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Number of rows : 14
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 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
2 PSR J0218+42 Psr 02 18 06.3604 +42 32 17.365           ~ 365 2
3 4C 37.10 Rad 04 00 45.43 +37 47 50.5           ~ 3 2
4 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 1002 2
5 4C 39.13 Rad 04 23 46.533 +40 04 09.19           ~ 6 1
6 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
7 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1573 1
8 3C 196 Sy1 08 13 36.0561170112 +48 13 02.644966020   18.36 17.79     ~ 578 2
9 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
10 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
11 3C 295 Sy1 14 11 20.6 +52 12 09   22.34 20.80 18.54   ~ 1021 4
12 2C 1569 Bla 18 29 31.7809732968 +48 44 46.160168892   17.05 16.81 16.860   ~ 713 1
13 MCG+07-41-003 Bla 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2537 2
14 NAME Cas A SNR 23 23 26.0 +58 48 41     14.30     ~ 3033 1

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