Identifications and spectroscopy of faint radio galaxies from the B3 VLA survey

Details Identifications and spectroscopy of faint radio galaxies from the B3 VLA survey Identifications and spectroscopy of faint radio galaxies from the B3 VLA survey

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108..828t&link_type=abstract

The Astronomical Journal, vol. 108, no. 3, p. 828-836

Astronomy and Astrophysics

Astronomy

15

Galactic Clusters, Lyman Alpha Radiation, Radio Astronomy, Radio Emission, Radio Galaxies, Radio Spectra, Red Shift, Sky Surveys (Astronomy), Very Large Array (Vla), Galactic Nuclei, Histograms, Optical Properties, Sampling, Tables (Data)

Scientific paper

We present interim results from a program to identify selected steep-spectrum sources from a statistically complete subset of the B3VLA (very large array) radio survey. Faint optical identifications and redshifts are presented here for 10 sources. The median redshift for this subset of faint B3VLA sources is approx. 1, with the highest z = 3.22 for B3 1232+397B (previously identified as a 6C source). Another source, B3 1204+401 at z = 2.066, shows multiple optical components along the position angle given by the radio structure. Their separation is approx. 100 kpc in the restframe, with the largest redshift difference as measured from the Ly alpha lines giving delta V approx. 4000 km/s in the restframe. This system may be a spectacular example of jet-galaxy interaction, or a cluster core forming at large redshift. At least one other source, B3 1216+402 at z = 0.756, appears to reside in a rich cluster. A preliminary comparison using an r-band Hubble diagram suggests that these moderate-power B3 galaxies are somewhat less luminous that the powerful 3CR galaxies at comparable redshifts. They also show only a marginal tendency for radio-optical alignments, in contrast to the samples of powerful sources, such as 3CR. Thus they may be on the average less affected by their active nuclei, and be more representative of giant ellipticals at large redshifts.

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