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Recent structural evolution of early-type galaxies : size growth from z=1 to z=0

(2008) ASTROPHYSICAL JOURNAL. 688(1). p.48-58
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Abstract
Strong size and internal density evolution of early-type galaxies between z similar to 2 and the present has been reported by several authors. Here we analyze samples of nearby and distant (z similar to 1) galaxies with dynamically measured masses in order to confirm the previous, model-dependent results and constrain the uncertainties that may play a role. Velocity dispersion (sigma) measurements are taken from the literature for 50 morphologically selected 0.8 < z < 1.2 field and cluster early-type galaxies with typical masses M-dyn = 2 x 10(11) M-circle dot. Sizes (R-eff) are determined with Advanced Camera for Surveys imaging. We compare the distant sample with a large sample of nearby (0.04 < z < 0.08) early-type galaxies extracted from the Sloan Digital Sky Survey for which we determine sizes, masses, and densities in a consistent manner, using simulations to quantify systematic differences between the size measurements of nearby and distant galaxies. We find a highly significant difference between the sigma-R-eff distributions of the nearby and distant samples, regardless of sample selection effects. The implied evolution in R-eff at fixed mass between z = 1 and the present is a factor of 1.97 +/- 0.15. This is in qualitative agreement with semianalytic models; however, the observed evolution is much faster than the predicted evolution. Our results reinforce and are quantitatively consistent with previous, photometric studies that found size evolution of up to a factor of 5 since z similar to 2. A combination of structural evolution of individual galaxies through the accretion of companions and the continuous formation of early-type galaxies through increasingly gas-poor mergers is one plausible explanation of the observations.
Keywords
INITIAL MASS FUNCTION, DIGITAL SKY SURVEY, HUBBLE-SPACE-TELESCOPE, TO-LIGHT RATIOS, ELLIPTIC GALAXIES, FUNDAMENTAL PLANE, STAR-FORMATION, RED-SEQUENCE, LUMINOSITY FUNCTION, CLUSTER GALAXIES, galaxies: clusters: general, galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: formation, galaxies: fundamental, parameters, galaxies: general, galaxies: photometry

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Chicago
van der Wel, Arjen, Bradford P Holden, Andrew W Zirm, Marijn Franx, Alessandro Rettura, Garth D Illingworth, and Holland C Ford. 2008. “Recent Structural Evolution of Early-type Galaxies : Size Growth from Z=1 to Z=0.” Astrophysical Journal 688 (1): 48–58.
APA
van der Wel, A., Holden, B. P., Zirm, A. W., Franx, M., Rettura, A., Illingworth, G. D., & Ford, H. C. (2008). Recent structural evolution of early-type galaxies : size growth from z=1 to z=0. ASTROPHYSICAL JOURNAL, 688(1), 48–58.
Vancouver
1.
van der Wel A, Holden BP, Zirm AW, Franx M, Rettura A, Illingworth GD, et al. Recent structural evolution of early-type galaxies : size growth from z=1 to z=0. ASTROPHYSICAL JOURNAL. 2008;688(1):48–58.
MLA
van der Wel, Arjen, Bradford P Holden, Andrew W Zirm, et al. “Recent Structural Evolution of Early-type Galaxies : Size Growth from Z=1 to Z=0.” ASTROPHYSICAL JOURNAL 688.1 (2008): 48–58. Print.
@article{8575455,
  abstract     = {Strong size and internal density evolution of early-type galaxies between z similar to 2 and the present has been reported by several authors. Here we analyze samples of nearby and distant (z similar to 1) galaxies with dynamically measured masses in order to confirm the previous, model-dependent results and constrain the uncertainties that may play a role. Velocity dispersion (sigma) measurements are taken from the literature for 50 morphologically selected 0.8 < z < 1.2 field and cluster early-type galaxies with typical masses M-dyn = 2 x 10(11) M-circle dot. Sizes (R-eff) are determined with Advanced Camera for Surveys imaging. We compare the distant sample with a large sample of nearby (0.04 < z < 0.08) early-type galaxies extracted from the Sloan Digital Sky Survey for which we determine sizes, masses, and densities in a consistent manner, using simulations to quantify systematic differences between the size measurements of nearby and distant galaxies. We find a highly significant difference between the sigma-R-eff distributions of the nearby and distant samples, regardless of sample selection effects. The implied evolution in R-eff at fixed mass between z = 1 and the present is a factor of 1.97 +/- 0.15. This is in qualitative agreement with semianalytic models; however, the observed evolution is much faster than the predicted evolution. Our results reinforce and are quantitatively consistent with previous, photometric studies that found size evolution of up to a factor of 5 since z similar to 2. A combination of structural evolution of individual galaxies through the accretion of companions and the continuous formation of early-type galaxies through increasingly gas-poor mergers is one plausible explanation of the observations.},
  author       = {van der Wel, Arjen and Holden, Bradford P and Zirm, Andrew W and Franx, Marijn and Rettura, Alessandro and Illingworth, Garth D and Ford, Holland C},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {INITIAL MASS FUNCTION,DIGITAL SKY SURVEY,HUBBLE-SPACE-TELESCOPE,TO-LIGHT RATIOS,ELLIPTIC GALAXIES,FUNDAMENTAL PLANE,STAR-FORMATION,RED-SEQUENCE,LUMINOSITY FUNCTION,CLUSTER GALAXIES,galaxies: clusters: general,galaxies: elliptical and lenticular,cD,galaxies: evolution,galaxies: formation,galaxies: fundamental,parameters,galaxies: general,galaxies: photometry},
  language     = {eng},
  number       = {1},
  pages        = {48--58},
  title        = {Recent structural evolution of early-type galaxies : size growth from z=1 to z=0},
  url          = {http://dx.doi.org/10.1086/592267},
  volume       = {688},
  year         = {2008},
}

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