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

Research output: Contribution to journalReview articlepeer-review

188 Scopus citations

Abstract

We derive the close, kinematic pair fraction and merger rate up to redshift 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 x 10-4 h3 Mpc -3 Gyr-1 for z ̃ 0.5-1.2. Most previous studies have yielded higher values.

Original languageEnglish (US)
Pages (from-to)L9-L12
JournalAstrophysical Journal
Volume617
Issue number1 II
DOIs
StatePublished - Dec 10 2004
Externally publishedYes

Keywords

  • Galaxies: evolution
  • Galaxies: interactions
  • Large-scale structure of universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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