The Environments of Post-Starburst Quasars

Details The Environments of Post-Starburst Quasars The Environments of Post-Starburst Quasars

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.0218c&link_type=abstract

American Astronomical Society Meeting 210, #02.18; Bulletin of the American Astronomical Society, Vol. 39, p.95

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Scientific paper

We compare the environments of post-starburst quasars with those of normal quasars on a variety of scales. Post-starburst quasars are broad-lined AGN that also posses the spectral signatures of massive, moderate-aged stellar populations (in excess of ten billion solar masses and ages of hundreds of Myrs). We present the set of post-starburst quasars (540) from a large sample of quasars (15098) identified from the SDSS Data Release 3 (DR3) Catalog in order to further study the environments. We use photometric redshifts based on SDSS imaging to compare the incidence of companion galaxies on scales of 10 to 100 kiloparsecs, and find only a marginal excess of galaxies around post-starburst quasars. We use image stacking to compare the immediate environments on 10 kiloparsec and smaller scales, finding a more pronounced difference. Spectroscopy of some companion objects has been used to test some photometric redshifts and to investigate interesting interactions in select systems. We conclude that the large scale environments of post-starburst quasars are not dissimilar from those of other quasars, and that a more immediate small scale interaction is the primary cause of the post-starburst activity in most objects of the class.

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