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Abstract
We explore the rate and impact of galaxy mergers on the massive galaxy population using the amplitude of the two-point correlation function on small scales for M* > 5 x 10(10) M(circle dot) galaxies from the COSMOS and COMBO-17 surveys. Using a pair fraction derived from the Sloan Digital Sky Survey as a low-redshift benchmark, the large survey area at intermediate redshifts allows us to determine the evolution of the close-pair fraction with unprecedented accuracy for a mass-selected sample: we find that the fraction of galaxies more massive than 5 x 10(10) M(circle dot) in pairs separated by less than 30 kpc in three-dimensional space evolves as F(z) = (0.0130 +/- 0.0019) x(1 + z)(1.21 +/- 0.25) between z = 0 and z = 1.2. Assuming a merger timescale of 0.5 Gyr, the inferred merger rate is such that galaxies with mass in excess of 10(11) M(circle dot) have undergone, on average, 0.5 (0.7) mergers involving progenitor galaxies both more massive than 5 x 10(10) M(circle dot) since z = 0.6 (1.2). We also study the number density evolution of massive red sequence galaxies using published luminosity functions and constraints on the M/L B evolution from the fundamental plane. Moreover, we demonstrate that the measured merger rate of massive galaxies is sufficient to explain this observed number density evolution in massive red sequence galaxies since z = 1.
Keywords
HUBBLE-SPACE-TELESCOPE, STAR-FORMATION, RED GALAXIES, LUMINOSITY, FUNCTION, REDSHIFT SURVEY, STELLAR MASS, PHOTOMETRIC REDSHIFTS, POPULATION SYNTHESIS, ELLIPTIC GALAXIES, COMBO-17 SURVEY, galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: formation, galaxies: general galaxies: interactions, galaxies: statistics

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Chicago
Robaina, Aday R, Eric F Bell, Arjen van der Wel, Rachel S Somerville, Rosalind E Skelton, Daniel H McIntosh, Klaus Meisenheimer, and Christian Wolf. 2010. “The Merger-driven Evolution of Massive Galaxies.” Astrophysical Journal 719 (1): 844–850.
APA
Robaina, A. R., Bell, E. F., van der Wel, A., Somerville, R. S., Skelton, R. E., McIntosh, D. H., Meisenheimer, K., et al. (2010). The merger-driven evolution of massive galaxies. ASTROPHYSICAL JOURNAL, 719(1), 844–850.
Vancouver
1.
Robaina AR, Bell EF, van der Wel A, Somerville RS, Skelton RE, McIntosh DH, et al. The merger-driven evolution of massive galaxies. ASTROPHYSICAL JOURNAL. 2010;719(1):844–50.
MLA
Robaina, Aday R, Eric F Bell, Arjen van der Wel, et al. “The Merger-driven Evolution of Massive Galaxies.” ASTROPHYSICAL JOURNAL 719.1 (2010): 844–850. Print.
@article{8575374,
  abstract     = {We explore the rate and impact of galaxy mergers on the massive galaxy population using the amplitude of the two-point correlation function on small scales for M* > 5 x 10(10) M(circle dot) galaxies from the COSMOS and COMBO-17 surveys. Using a pair fraction derived from the Sloan Digital Sky Survey as a low-redshift benchmark, the large survey area at intermediate redshifts allows us to determine the evolution of the close-pair fraction with unprecedented accuracy for a mass-selected sample: we find that the fraction of galaxies more massive than 5 x 10(10) M(circle dot) in pairs separated by less than 30 kpc in three-dimensional space evolves as F(z) = (0.0130 +/- 0.0019) x(1 + z)(1.21 +/- 0.25) between z = 0 and z = 1.2. Assuming a merger timescale of 0.5 Gyr, the inferred merger rate is such that galaxies with mass in excess of 10(11) M(circle dot) have undergone, on average, 0.5 (0.7) mergers involving progenitor galaxies both more massive than 5 x 10(10) M(circle dot) since z = 0.6 (1.2). We also study the number density evolution of massive red sequence galaxies using published luminosity functions and constraints on the M/L B evolution from the fundamental plane. Moreover, we demonstrate that the measured merger rate of massive galaxies is sufficient to explain this observed number density evolution in massive red sequence galaxies since z = 1.},
  author       = {Robaina, Aday R and Bell, Eric F and van der Wel, Arjen and Somerville, Rachel S and Skelton, Rosalind E and McIntosh, Daniel H and Meisenheimer, Klaus and Wolf, Christian},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {HUBBLE-SPACE-TELESCOPE,STAR-FORMATION,RED GALAXIES,LUMINOSITY,FUNCTION,REDSHIFT SURVEY,STELLAR MASS,PHOTOMETRIC REDSHIFTS,POPULATION SYNTHESIS,ELLIPTIC GALAXIES,COMBO-17 SURVEY,galaxies: elliptical and lenticular,cD,galaxies: evolution,galaxies: formation,galaxies: general galaxies: interactions,galaxies: statistics},
  language     = {eng},
  number       = {1},
  pages        = {844--850},
  title        = {The merger-driven evolution of massive galaxies},
  url          = {http://dx.doi.org/10.1088/0004-637X/719/1/844},
  volume       = {719},
  year         = {2010},
}

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