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29 March 2024
 
  » arxiv » astro-ph/0411104

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The Deep2 Galaxy Redshift Survey: Evolution of Close Galaxy Pairs and Major-Merger Rates Up to z ~ 1.2
Lihwai Lin ; David C. Koo ; Christopher N. A. Willmer ; David R. Patton ; Christopher J. Conselice ; Renbin Yan ; Alison L. Coil ; Michael C. Cooper ; Marc Davis ; S. M. Faber ; Brian F. Gerke ; Puragra Guhathakurta ; Jeffrey A. Newman ;
Date 4 Nov 2004
Journal Astrophys.J. 617 (2004) L9-L12
Subject astro-ph
Affiliation1,2), David C. Koo , Christopher N. A. Willmer , David R. Patton , Christopher J. Conselice , Renbin Yan , Alison L. Coil , Michael C. Cooper , Marc Davis , S. M. Faber , Brian F. Gerke , Puragra Guhathakurta , Jeffrey A. Newman ( National Taiwan Uni
AbstractWe derive the close, kinematic pair fraction and merger rate up to z ~ 1.2 from the initial data of the DEEP2 Redshift Survey. Assuming a mild luminosity evolution, the number of companions per luminous galaxy is found to evolve as (1+z)^{m}, with m = 0.51+-0.28; assuming no evolution, m = 1.60+-0.29. Our results imply that only 9% of present-day $L^{*}$ galaxies have undergone major mergers since z ~ 1.2 and that the average major merger rate is about 4* 10^{-4} h^{3} Mpc^{-3} Gyr^{-1} for z ~ 0.5 - 1.2. Most previous studies have yielded higher values.
Source arXiv, astro-ph/0411104
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