The R-band Hubble diagram for gigahertz peaked spectrum radio galaxies.

Details The R-band Hubble diagram for gigahertz peaked spectrum radio galaxies. The R-band Hubble diagram for gigahertz peaked spectrum radio galaxies.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.279.1294s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. Vol. 279, No. 4, p. 1294 - 1302

Astronomy and Astrophysics

Astronomy

47

Galaxies: Active -- Galaxies: Evolution -- Galaxies: Photometry, Radio Galaxies: Optical Spectra, Radio Galaxies: Hubble Diagram, Radio Galaxies: Galaxy Evolution

Scientific paper

The authors show that the R-band Hubble relation for gigahertz peaked spectrum (GPS) radio galaxies has a low dispersion and steep slope. It is comparable to that for first-ranked cluster galaxies, but spans a much greater redshift range. Its dispersion is significantly smaller than that of 3C radio galaxies. In addition, GPS galaxies are clearly fainter than 3C galaxies at z > 0.5, probably because GPS galaxies are intrinsically redder. This may be due to GPS galaxies not having the extended UV-optical component that is present in high-redshift 3C galaxies. The GPS Hubble diagram is consistent with galaxies having an old stellar population that undergoes no cosmological evolution. However, it is possible that the dynamical evolution and stellar evolution of GPS galaxies fortuitously combine to produce a Hubble relation which is consistent with a non-evolutionary scenario. An alternative explanation is that GPS galaxies are in a special phase of their evolution, the "GPS" phase, which is identical at all cosmological epochs.

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