Searching for Mergers in Early-Type QSO Host Galaxies and a Control Sample of Inactive Ellipticals

Details Searching for Mergers in Early-Type QSO Host Galaxies and a Control Sample of Inactive Ellipticals Searching for Mergers in Early-Type QSO Host Galaxies and a Control Sample of Inactive Ellipticals

2007-10-08

arxiv.org/abs/0710.1504v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure; To appear in the proceedings of IAU Symposium 245, "Formation and Evolution of Galaxy Bulges," M. Bureau, E

Scientific paper

10.1017/S1743921308017742

We present very deep HST/ACS images of five QSO host galaxies, classified as undisturbed ellipticals in earlier studies. For four of the five objects, our images reveal strong signs of interaction such as tidal tails, shells, and other fine structure, suggesting that a large fraction of QSO host galaxies may have experienced a relatively recent merger event. Our preliminary results for a control sample of inactive elliptical galaxies do not reveal comparable fine structure.

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