Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-03-31
Astron.J.116:1039-1054,1998
Astronomy and Astrophysics
Astrophysics
30 page aas latex file, figures and tables available at http://www.cv.nrao.edu/~jkempner/vla-hdf/sources/, submitted to AJ
Scientific paper
10.1086/300489
We report on sensitive radio observations made with the VLA at 8.5 GHz, centered on the Hubble Deep Field (HDF). We collected data in the A, CnB, C, DnC, and D configurations, corresponding to angular resolutions ranging from 0.3" to 10". We detected 29 radio sources in a complete sample within 4.6' of the HDF center and above a flux density limit of 9.0 microjy (5 sigma). Seven of these sources are located within the HDF itself, while the remaining 22 sources are covered by the Hubble Flanking Fields (HFFs) or ground based optical images. All of the sources in the HDF are identified with galaxies with a mean magnitude R = 21.7, while the mean magnitude of the identifications outside the HDF is R = 22.1. Three radio sources have no optical counterparts to R = 27. Based on a radio and optical positional coincidence, we detected an additional 19 radio sources in this field (seven of which are contained in the HDF) with 6.3 microjy < S < 9.0 (3.5 sigma < S < 5 sigma) and and R < 25, but which are not included in the complete sample. At least 2/3 of the optical identifications of these microjansky radio sources are with disk systems (i.e., irregulars, mergers and spirals). We briefly discuss the possible physical mechnisms driving the strong evolution in the microjansky radio galaxy population. [truncated]
Fomalont Edward B.
Kellermann Kenneth I.
Partridge Robert B.
Richards Eric. A.
Windhorst Rogier A.
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