The Astronomical Journal

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The Astronomical Journal Volume 137 Number 3 Create an alert RSS this journal

J. B. Hutchings et al. 2009 The Astronomical Journal 137 3533 doi:10.1088/0004-6256/137/3/3533

ENVIRONMENTS OF QSOs AT REDSHIFT 0.9-1.3*

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J. B. Hutchings1, P. Scholz1 and L. Bianchi2

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Abstract References Cited By

We analyze new deep g- and i-band imaging of 16 QSOs in the redshift range 0.9-1.3 with the Canada-France-Hawaii Telescope. The principal points of interest are the symmetry and signs of tidal effects in the QSO hosts and nearby (companion) galaxies. The sample measures are compared with similar measures on randomly selected field galaxy samples. Asymmetry measures are made for all objects to g ~ 22, and magnitudes of all galaxies 2 mag fainter. The QSOs are found in denser environments than the field, and are somewhat offset from the centroid of their surrounding galaxies. The QSO hosts appear more disturbed than other galaxies. While the QSO companions and field galaxies have the same average asymmetry, the distribution of asymmetry values is different. QSO companions within 15'' are fainter than average field galaxies. We discuss scenarios that are consistent with these and other measured quantities.


Footnote
*  Based on observations obtained with the Canada-France-Hawaii Telescope, which is operated by CNRS of France, NRC of Canada, and the University of Hawaii.
Keywords

galaxies: evolution; galaxies: interactions; quasars: general


Dates

Issue 3 (2009 March)

Received 2008 August 7, accepted for publication 2008 December 21

Published 2009 February 17



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