The VLA-COSMOS survey. III. Further catalog analysis and the radio source counts

被引：103

作者：

Bondi, M. ^{[1
]}

Ciliegi, P. ^{[2
]}

Schinnerer, E. ^{[3
]}

Smolcic, V. ^{[3
]}

Jahnke, K. ^{[3
]}

Carilli, C. ^{[4
]}

Zamorani, G. ^{[2
]}

机构：

[1] CNR, Ist Radioastron, INAF, I-40129 Bologna, Italy

[2] Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy

[3] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[4] Natl Radio Astron Observ, Socorro, NM 87801 USA

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 681卷 / 02期

关键词：

methods : data analysis; radio continuum : galaxies; surveys;

D O I：

10.1086/589324

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The VLA-COSMOS Large Project has imaged the 2 deg(2) COSMOS field with a resolution of 1.5 '' and a sensitivity of about 11 mu Jy (1 sigma), yielding a catalog of similar to 3600 radio sources. In this paper we present a further analysis of the VLA-COSMOS Large Project catalog of radio sources aimed to (1) quantify and correct for the effect of bandwidth smearing in the catalog, (2) determine the incompleteness produced by the noise bias and the resolution bias in the new catalog, and (3) derive the radio source counts at 1.4 GHz. The effect of bandwidth smearing on the radio sources in the catalog was quantified comparing the peak and total flux densities in the final mosaic and in each of the individual pointings where the source was closest to the center of the field. We find that the peak flux densities in the original VLA- COSMOS Large Project catalog have to be divided by a factor of about 0.8 or 0.9, depending on the distance from the mosaic center. The completeness of the radio catalog has been tested using samples of simulated radio sources with different angular size distributions. These simulated sources have been added to the radio image and recovered using the same techniques used to produce the radio catalog. The fraction of missed sources as a function of the total flux density is a direct measure of the incompleteness. Finally, we derived the radio source counts down to 60 mu Jy with unprecedented good statistics. Comparison to the findings of other surveys shows good agreement in the flux density range 0.06-1 mJy confirming the upturn at similar to 0.5 mJy and a possible decline of the source counts below similar to 0.1 mJy.

引用

页码：1129 / 1135

页数：7

共 38 条

[1] The Phoenix Deep Survey: Spectroscopic catalog [J].

Afonso, J ;

Georgakakis, A ;

Almeida, C ;

Hopkins, AM ;

Cram, LE ;

Mobasher, B ;

Sullivan, M .

ASTROPHYSICAL JOURNAL, 2005, 624 (01) :135-154

[2] SPECTROSCOPY OF FAINT RADIO-SOURCES - THE NATURE OF THE SUB-MJY RADIO-SOURCE POPULATION [J].

BENN, CR ;

ROWANROBINSON, M ;

MCMAHON, RG ;

BROADHURST, TJ ;

LAWRENCE, A .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1993, 263 (01) :98-122

[3] COSBO: The MAMBO 1.2 millimeter imaging survey of the COSMOS field [J].

Bertoldi, F. ;

Carilli, C. ;

Aravena, M. ;

Schinnerer, E. ;

Voss, H. ;

Smolcic, V. ;

Jahnke, K. ;

Scoville, N. ;

Blain, A. ;

Menten, K. M. ;

Lutz, D. ;

Brusa, M. ;

Taniguchi, Y. ;

Capak, P. ;

Mobasher, B. ;

Lilly, S. ;

Thompson, D. ;

Aussel, H. ;

Kreysa, E. ;

Hasinger, G. ;

Aguirre, J. ;

Schlaerth, J. ;

Koekemoer, A. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2007, 172 (01) :132-149

[4] The VVDS-VLA deep field -: III.: GMRT observations at 610 MHz and the radio spectral index properties of the sub-mJy population [J].

Bondi, M. ;

Ciliegi, P. ;

Venturi, T. ;

Dallacasa, D. ;

Bardelli, S. ;

Zucca, E. ;

Athreya, R. M. ;

Gregorini, L. ;

Zanichelli, A. ;

Le Fevre, O. ;

Contini, T. ;

Garilli, B. ;

Iovino, A. ;

Temporin, S. ;

Vergani, D. .

ASTRONOMY & ASTROPHYSICS, 2007, 463 (02) :519-527

[5] The VLA-VIRMOS deep field -: I.: Radio observations probing the μJy source population [J].

Bondi, M ;

Ciliegi, P ;

Zamorani, G ;

Gregorini, L ;

Vettolani, G ;

Parma, P ;

de Ruiter, H ;

Le Fevre, O ;

Arnaboldi, M ;

Guzzo, L ;

Maccagni, D ;

Scaramella, R ;

Adami, C ;

Bardelli, S ;

Bolzonella, M ;

Bottini, D ;

Cappi, A ;

Foucaud, S ;

Franzetti, P ;

Garilli, B ;

Gwyn, S ;

Ilbert, O ;

Iovino, A ;

Le Brun, V ;

Marano, B ;

Marinoni, C ;

McCracken, HJ ;

Meneux, B ;

Pollo, A ;

Pozzetti, L ;

Radovich, M ;

Ripepi, V ;

Rizzo, D ;

Scodeggio, M ;

Tresse, L ;

Zanichelli, A ;

Zucca, E .

ASTRONOMY & ASTROPHYSICS, 2003, 403 (03) :857-867

[6] The first release COSMOS optical and near-IR data and catalog [J].

Capak, P. ;

Aussel, H. ;

Ajiki, M. ;

McCracken, H. J. ;

Mobasher, B. ;

Scoville, N. ;

Shopbell, P. ;

Taniguchi, Y. ;

Thompson, D. ;

Tribiano, S. ;

Sasaki, S. ;

Blain, A. W. ;

Brusa, M. ;

Carilli, C. ;

Comastri, A. ;

Carollo, C. M. ;

Cassata, P. ;

Colbert, J. ;

Ellis, R. S. ;

Elvis, M. ;

Giavalisco, M. ;

Green, W. ;

Guzzo, L. ;

Hasinger, G. ;

Ilbert, O. ;

Impey, C. ;

Jahnke, K. ;

Kartaltepe, J. ;

Kneib, J.-P. ;

Koda, J. ;

Koekemoer, A. ;

Komiyama, Y. ;

Leauthaud, A. ;

Lefevre, O. ;

Lilly, S. ;

Liu, C. ;

Massey, R. ;

Miyazaki, S. ;

Murayama, T. ;

Nagao, T. ;

Peacock, J. A. ;

Pickles, A. ;

Porciani, C. ;

Renzini, A. ;

Rhodes, J. ;

Rich, M. ;

Salvato, M. ;

Sanders, D. B. ;

Scarlata, C. ;

Schiminovich, D. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2007, 172 (01) :99-116

[7] A deep VLA survey at 6 cm in the Lockman Hole [J].

Ciliegi, P ;

Zamorani, G ;

Hasinger, G ;

Lehmann, I ;

Szokoly, G ;

Wilson, G .

ASTRONOMY & ASTROPHYSICS, 2003, 398 (03) :901-918

[8] The radio/optical catalog of the SSA 13 field [J].

Fomalont, E. B. ;

Kellermann, K. I. ;

Cowie, L. L. ;

Capak, P. ;

Barger, A. J. ;

Partridge, R. B. ;

Windhorst, R. A. ;

Richards, E. A. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2006, 167 (02) :103-160

[9] The Phoenix Survey: optical and near-infrared observations of faint radio sources [J].

Georgakakis, A ;

Mobasher, B ;

Cram, L ;

Hopkins, A ;

Lidman, C ;

Rowan-Robinson, M .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1999, 306 (03) :708-726

[10] Optical identifications and spectroscopy of a faint radio source sample: the nature of the sub-mJy population [J].

Gruppioni, C ;

Mignoli, M ;

Zamorani, G .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1999, 304 (01) :199-217

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