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Title: The evolution of galaxy size and morphology at z ∼ 0.5-3.0 in the GOODS-N region with Hubble space telescope/WFC3 data

We analyze the recently released Hubble Space Telescope/Wide Field Camera 3 IR images in the GOODS-N region to study the formation and evolution of quiescent galaxies (QGs). After examining the reliability of two-dimensional light profiles with artificial galaxies, we obtain the morphological parameters with Sérsic profile of 299 QGs and 1083 star-forming galaxies (SFGs) at z ∼ 0.5-3.0, finding the evolution of r {sub e} and n of massive (M {sub *} ≥ 10{sup 10.5} M {sub ☉}) QGs and weaker evolution of SFGs and less massive (M {sub *} < 10{sup 10.5} M {sub ☉}) QGs. The regression of the size evolution of massive QGs follows r{sub e}∝(1+z){sup −α{sub r}{sub e}} with α{sub r{sub e}}=1.06±0.19 (a factor of ∼2.2 increases from z ∼ 2.5 to ∼0.5), which is consistent with the general picture of the significant size growth. For the further understanding of the evolution scenario, we study the evolution of the Sérsic index, n, and find that massive QGs significantly evolve as n∝(1+z){sup −α{sub n}} with α {sub n} = 0.74 ± 0.23 (n ∼ 1 at z ∼ 2.5 to n ∼ 4 at z ∼ 0.5), while those of the other populations are unchanged (n ∼more » 1) over the redshift range. The results in the present study are consistent with both observations and numerical simulations where a gas-poor minor merger is believed to be the main evolution scenario. By taking the connection with less massive QGs and SFGs into account, we discuss the formation and evolution of the massive QGs over 'Cosmic High Noon', or the peak of star-formation in the universe.« less
Authors:
;  [1] ;  [2]
  1. Astronomical Institute, Tohoku University, Aramaki, Aoba, Sendai 980-8578 (Japan)
  2. Research Center for Space and Cosmic Evolution, Ehime University, Bunkyo-cho, Matsuyama 790-8577 (Japan)
Publication Date:
OSTI Identifier:
22357187
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 785; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPUTERIZED SIMULATION; EVOLUTION; GALAXIES; RED SHIFT; RELIABILITY; SPACE; STARS; TELESCOPES; TWO-DIMENSIONAL CALCULATIONS; UNIVERSE; VISIBLE RADIATION