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RISS 인기검색어
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- 저자 : McPartland, Conor (검색결과 1 건)
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EVOLUTION OF STAR FORMATION PROPERTIES OF HIGH-REDSHIFT CLUSTER GALAXIES SINCE<i>z</i>= 2
Lee, Seong-Kook,Im, Myungshin,Kim, Jae-Woo,Lotz, Jennifer,McPartland, Conor,Peth, Michael,Koekemoer, Anton IOP Publishing 2015 The Astrophysical journal Vol.810 No.2
<P>Using a stellar mass-limited sample of similar to 46,600 galaxies (M-* > 10(9.1)M(circle dot)) at 0.5 < z < 2, we show that the stellar mass, rather than the environment, is the main parameter controlling quenching of star formation in galaxies with M-* > 10(10)M(circle dot) out to z = 2. On the other hand, the environmental quenching becomes efficient at z < 1 regardless of galaxy mass, and it serves as a main mechanism. for quenching star formation for lower mass galaxies. Our result is based on deep optical and near-infrared imaging data over 2800 arcmin(2), enabling us to negate cosmic variance and identify 46 galaxy cluster candidates with M similar to 10(14) M-circle dot. From M-* similar to 10(9.5) to 10(10.5) M-circle dot, the fraction of quiescent galaxies increases by a factor of similar to 10 over the entire redshift range, but the difference between cluster and field environment is negligible. Rapid evolution in the quiescent fraction is seen from z = 2 to z = 1.3 for massive galaxies, suggesting a build-up of massive quiescent galaxies at z > 1.3. For galaxies with M-circle dot < 10(10)M(circle dot) at z < 1.0, the quiescent fraction is found to be as much as a factor of 2 larger in clusters than in field, showing the importance of environmental quenching in low-mass galaxies at low redshift. Most high-mass galaxies are already quenched at z > 1, therefore environmental quenching does not play a significant role for them, although the efficiency of environmental quenching is nearly identical between high-and low-mass galaxies.</P>
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