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Heald G. H., Pizzo R. F., Orrù Emanuela, Breton R. P., Carbone Dario, Ferrari C., Hardcastle M. J., Jurusik W., Macario Giulia, Mulcahy D. D., Rafferty David, Asgekar A., Brentjens M., Fallows R. A., Frieswijk W., Toribio M. Carmen, Adebahr Björn, Arts M., Bell Michael R., Bonafede Annalisa, Bray J., Broderick J., Cantwell T. M., Carroll P., Cendes Yvette, Clarke A. O., Croston J., Daiboo Soobash, De Gasperin Francesco, Gregson J., Harwood J. J., Hassall T. E., Heesen V., Horneffer Andreas, Van der Horst Alexander J., Iacobelli Marco, Jelic Vibor, Jones D., Kant D., Kokotanekov G., Martin P., McKean John P., Morabito Leah K., Nikiel-Wroczyñski B. S., Offringa André R., Pandey V. N., Pandey-Pommier M., Pietka M., Pratley L., Riseley C., Rowlinson Antonia, Sabater J., Scaife Anna M. M., Scheers L. H. A., Sendlinger K., Shulevski Aleksandar, Sipior M., Sobey C. A., Stewart Adam J., Stroe A., Swinbank John D., Tasse Cyril, Trüstedt J., Varenius Eskil, Van Velzen S., Vilchez N., Van Weeren Reinout J., Wijnholds S. J., Williams W. L., De Bruyn A. G., Nijboer R., Wise Michael W., Alexov A., Anderson J., Avruch Ian M., Beck Rainer, Ockert-Bell Maureen E., Van Bemmel Ilse, Bentum Mark J., Bernardi Gianni, Best P., Breitling F., Brouw W. N., Brüggen M., Butcher H. R., Ciardi B., Conway John E., De Geus E., De Jong A., De Vos M., Deller A., Dettmar R.-J., Duscha S., Eislöffel Jochen, Engels D., Falcke Heino, Fender R., Garrett Michael A., Grießmeier Jean-Mathias, Gunst A. W., Hamaker J. P., Hessels J. W. T., Hoeft Matthias, Hörandel J. R., Holties H. A., Intema H. T., Jackson N. J., Jütte E., Karastergiou A., Klijn W. F. A., Kondratiev Vladislav I., Koopmans L. V. E., Kuniyoshi M., Kuper G., Law Casey J., Van Leeuwen Joeri, Loose M., Maat P., Markoff Sera, McFadden R. A., McKay-Bukowski D., Mevius M., Miller-Jones James C., Morganti Raffaella, Munk H., Nelles A., Noordam J. E., Norden M. J., Paas H., Polatidis A. G., Reich W., Renting A., Röttgering H. J. A., Schoenmakers A. P., Schwarz Dominik J., Sluman J., Smirnov O. Yu., Stappers Benjamin W., Steinmetz Matthias, Tagger M., Tang Y., Ter Veen S., Thoudam S., Vermeulen R., Vocks C., Vogt C., Wijers Ralph A. M. J., Wucknitz Olaf, Yatawatta Sarod, Zarka Philippe

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

Astronomy and Astrophysics, 2015, vol. 582

Référence DOI : 10.1051/0004-6361/201425210
Référence ADS : 2015A&A...582A.123H

Résumé :

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 160 MHz). 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 74 MHz and 151 MHz respectively. The survey performance is illustrated within the MSSS Verification Field (MVF), a region of 100 square degrees centered at (alpha,delta)<SUB>J2000</SUB> = (15<SUP>h</SUP>,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 100 mJy at 135 MHz with 108" resolution, and 550 mJy at 50 MHz with 166" resolution. Images and catalogs for the full survey, expected to contain 150 000-200 000 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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