Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...470..806o&link_type=abstract
Astrophysical Journal v.470, p.806
Astronomy and Astrophysics
Astronomy
51
Galaxies: Evolution, Radio Continuum: Galaxies
Scientific paper
We discuss the results of broadband optical imaging of the host galaxies of a sample of 40 GHz peaked-spectrum (GPS) radio galaxies. The GPS galaxies have absolute magnitudes in the R_c_ band between -22 and -24.0, consistent with brightest cluster galaxies and the hosts of other powerful radio sources. The GPS Hubble diagram and the redshift distribution of r - i colors are consistent with both no-evolution models and passive evolution models for elliptical galaxies. The GPS galaxies are in good agreement with the RC band Hubble diagram for 3CR galaxies at low redshifts, z <~ 0.5. At higher redshifts, there is a suggestion that the GPS galaxies are about 1 mag fainter than the 3CR galaxies. If real, this may be due to 3CR galaxies having an extra component of blue light (the aligned component?) that is not present in the GPS galaxies. We suggest that the presence or lack of the blue light may be related to the presence or lack of a powerful extended radio source.
Baum Stefi A.
Charlot Stephane
O'Dea Christopher P.
Stanghellini Carlo
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