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Title:
The Galaxy Merger Rate in the Hubble Ultra-Deep Field at z>1
Authors:
Ryan, Russell E., Jr.; Cohen, S. H.; Windhorst, R. A.; Silk, J.
Affiliation:
AA(), AB(Arizona State Univ), AC(Arizona State Univ), AD(Arizona State Univ), AE(University of Oxford, United Kingdom)
Publication:
American Astronomical Society Meeting 210, #08.07; Bulletin of the American Astronomical Society, Vol. 38, p.104
Publication Date:
05/2007
Origin:
AAS
Bibliographic Code:
2007AAS...210.0807R

Abstract

We present a measurement of the galaxy merger rate to z 2.5 from Hubble Ultra-Deep Field high-resolution imaging and redshifts. We measure the merger rate from two methods: the traditional pair count and the Lee ratio, a statistic developed to quantify the bimodality in a dataset. With these methods, we show that the merger rate significantly deviates from the traditional power-law parametrization and peaks at z 2. For 0.5<z<1.0, our merger rate is in good agreement with similar studies at these redshifts. Since galaxy merging plays a significant role in galaxy evolution by triggering star formation, igniting AGN activity, and the dominate driver in galactic mass assembly, knowledge of the high redshift (z>1) merging is essential.
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