The faint radio sky: VLBA observations of the COSMOS field
Autor: | Ruiz, N. Herrera, Middelberg, E., Deller, A., Norris, R. P., Best, P. N., Brisken, W., Schinnerer, E., Smolcic, V., Delvecchio, I., Momjian, E., Bomans, D., Scoville, N. Z., Carilli, C. |
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Rok vydání: | 2017 |
Předmět: | |
Zdroj: | A&A 607, A132 (2017) |
Druh dokumentu: | Working Paper |
DOI: | 10.1051/0004-6361/201731163 |
Popis: | We study the faint radio population using wide-field very long baseline interferometry (VLBI) observations of 2865 known radio sources in the Cosmic Evolution Survey (COSMOS) field. The main objective of the project was to determine where active galactic nuclei (AGN) are present. The combination of number of sources, sensitivity, angular resolution and area covered by this project are unprecedented. We have detected 468 radio sources, expected to be AGNs, with the Very Long Baseline Array (VLBA) at 1.4 GHz. This is, to date, the largest sample assembled of VLBI detected sources in the sub-mJy regime. The input sample was taken from previous observations with the Very Large Array (VLA). We present the catalogue with additional multiwavelength information. We find a detection fraction of 20%, considering only those sources from the input catalogue which were in principle detectable with the VLBA (2361). As a function of redshift, we see no evolution of the detection fraction over the redshift range 0.5 Comment: 19 pages, 15 figures, 5 tables. Accepted for publication in A&A |
Databáze: | arXiv |
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