We have conducted a deep survey (rms noise â 17 μJj) with the Very Large Array (VLA) at 1.4 GHz, with a resolution of 6 arcsec, of a 1 deg2region included in the VIRMOS VLT Deep Survey. In the same field we already have multiband photometry down to IAB= 25, and spectroscopic observations will be obtained during the VIRMOS VLT survey. The homogeneous sensitivity over the whole field has allowed to derive a complete sample of 1054 radio sources (5Ï limit). We give a detailed description of the data reduction and of the analysis of the radio observations, with particular care to the effects of clean bias and bandwidth smearing, and of the methods used to obtain the catalogue of radio sources. To estimate the effect of the resolution bias on our observations we have modelled the effective angular-size distribution of the sources in our sample and we have used this distribution to simulate a sample of radio sources. Finally we present the radio count distribution down to 0.08 mJy derived from the catalogue. Our counts are in good agreement with the best fit derived from earlier surveys, and are about 50% higher than the counts in the HDF. The radio count distribution clearly shows, with extremely good statistics, the change in the slope for the sub-mJy radio sources.
The VLA-VIRMOS deep field I. Radio observations probing the microJy source population / M. Bondi, P. Ciliegi, G. Zamorani, L. Gregorini, G. Vettolani, P. Parma, H. De Ruiter, O. Le Fevre, M. Arnaboldi, L. Guzzo, D. Maccagni, R. Scaramella, C. Adami, S. Bardelli, M. Bolzonella, D. Bottini, A. Cappi, S. Foucaud, P. Franzetti, B. Garilli, S. Gwyn, O. Ilbert, A. Iovino, V. Le Brun, B. Marano, C. Marinoni, H.J. Mccracken, B. Meneux, A. Pollo, L. Pozzetti, M. Radovich, V. Ripepi, D. Rizzo, M. Scodeggio, L. Tresse, A. Zanichelli, E. Zucca. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - 403:3(2003 Jun 01), pp. 857-867. [10.1051/0004-6361:20030382]
The VLA-VIRMOS deep field I. Radio observations probing the microJy source population
L. Guzzo;
2003
Abstract
We have conducted a deep survey (rms noise â 17 μJj) with the Very Large Array (VLA) at 1.4 GHz, with a resolution of 6 arcsec, of a 1 deg2region included in the VIRMOS VLT Deep Survey. In the same field we already have multiband photometry down to IAB= 25, and spectroscopic observations will be obtained during the VIRMOS VLT survey. The homogeneous sensitivity over the whole field has allowed to derive a complete sample of 1054 radio sources (5Ï limit). We give a detailed description of the data reduction and of the analysis of the radio observations, with particular care to the effects of clean bias and bandwidth smearing, and of the methods used to obtain the catalogue of radio sources. To estimate the effect of the resolution bias on our observations we have modelled the effective angular-size distribution of the sources in our sample and we have used this distribution to simulate a sample of radio sources. Finally we present the radio count distribution down to 0.08 mJy derived from the catalogue. Our counts are in good agreement with the best fit derived from earlier surveys, and are about 50% higher than the counts in the HDF. The radio count distribution clearly shows, with extremely good statistics, the change in the slope for the sub-mJy radio sources.
| File | Dimensione | Formato | |
|---|---|---|---|
|
Bondi2003_VLA-VIRMOS.pdf
accesso riservato
Tipologia:
Publisher's version/PDF
Dimensione
930.61 kB
Formato
Adobe PDF
|
930.61 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
