Infrared Observations of 1-JANSKY Radio Source Identifications and Empty Fields

Details Infrared Observations of 1-JANSKY Radio Source Identifications and Empty Fields Infrared Observations of 1-JANSKY Radio Source Identifications and Empty Fields

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.215...37l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 215, NO.1/JUL01, P. 37, 1985

Astronomy and Astrophysics

Astronomy

57

Scientific paper

Infrared observations of 53 `1-jansky' radio sources are presented and discussed. Particular attention is paid to the observations of 12 `empty field' sources that have not been optically identified on CCD images to a limiting magnitude of r˜23.5. Seven of these empty field sources were detected in the K passband at significance levels greater than 4σ and all of the remainder produced net positive signals at lower significance levels. A comparison of the data on the identified sources with existing data on the more radio-luminous 3C radio galaxies has shown first that the 1 Jy radio galaxies have the same absolute magnitudes as the 3C radio galaxies, and secondly that at z˜1 they display the same range of active and passive evolution of their stellar populations. These results indicate that the changes seen in the optical/infrared properties of the high-redshift radio galaxies are primarily changes with redshift rather than radio luminosity. In the case of the empty-field observations, additional infrared colour measurements of two of these strongly suggest that they are high-redshift radio galaxies. If this is the case for all of the empty-field sources, then the lower limits to the (r-K) colours for the brighter infrared detections indicate that these are passively evolving giant elliptical galaxies at z˜2 that have no continuing star-formation activity and hence that the active evolution seen in radio galaxies at 0.52. The high fraction of infrared detections suggests that this sample does not contain a significant number of sources with z>5.

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