Optical CCD imaging of GHz-peaked-spectrum radio sources

Details Optical CCD imaging of GHz-peaked-spectrum radio sources Optical CCD imaging of GHz-peaked-spectrum radio sources

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apjs...88....1s&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 88, no. 1, p. 1-21.

Physics

92

Astronomical Photometry, Charge Coupled Devices, Emission Spectra, Extragalactic Radio Sources, Interacting Galaxies, Microwave Spectra, Visible Spectrum, Faraday Effect, Plasmas (Physics), Polarization (Waves), Quasars, Radio Galaxies

Scientific paper

Twenty-eight GHz-peaked-spectrum (GPS) radio sources, mainly radio galaxies, were imaged in the r and i optical bands in order to study the host galaxies and investigate the importance of galaxy-galaxy interactions in leading to the formation of this class of compact radio source. Here we present the observational results, while a subsequent paper will be devoted to the analysis and discussion. We find new identifications for seven objects previously classified as empty fields and one object misidentified with a Galactic star. This reduces the fraction of empty fields in the O'Dea et al. (1991) sample to only about 8 percent. We find and confirm that disturbed optical morphologies are a common characteristic of GPS radio galaxies. Many of them also have close companions and appear to lie in groups or clusters of galaxies, and several appear to have very red r - i (or r - K) colors suggesting the presence of dust. Thus, our results suggest that galaxy-galaxy interactions and/or mergers play an important role in the GPS phenomenon.

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