Galaxy companions to QSOs at Z = 2.3

Details Galaxy companions to QSOs at Z = 2.3 Galaxy companions to QSOs at Z = 2.3

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109..928h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 109, no. 3, p. 928-934

Astronomy and Astrophysics

Astronomy

26

Galactic Clusters, Line Spectra, Quasars, Radio Galaxies, Radio Observation, Red Shift, Starburst Galaxies, Brightness Distribution, Image Analysis, Luminosity, Radio Astronomy, Spatial Distribution

Scientific paper

R-band images have been obtained with Full Width at Half Maximum (FWHM) approximately 0.6 arcsec of seven Quasi-Stellar Objects (QSOs) at z = 2.3. Only one of the QSOs is radio loud. In all cases evidence is found for an excess of 6-19 galaxies, rising to magnitude R = 23, in a approximately 1 arcmin (100 kpc) region around the QSO. Overall, the excess is significant at greater than 5 sigma level. Many of these galaxies are compact and have low central condensation. It is suggested that these are compact groups of young galaxies in starburst or post-starburst phases which merge and evolve to become less evident at lower redshifts.

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