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Quenching of Star-formation Activity of High-redshift Galaxies in Clusters and Field

Published online by Cambridge University Press:  17 August 2016

Seong-Kook Lee ,
Myungshin Im ,
Jae-Woo Kim ,
Jennifer Lotz ,
Conor McPartland ,
Michael Peth  and
Anton Koekemoer
Seong-Kook Lee
Affiliation:
CEOU/Department of Physics and Astronomy, Seoul National University, Korea, email: [email protected]
Myungshin Im
Affiliation:
CEOU/Department of Physics and Astronomy, Seoul National University, Korea, email: [email protected]
Jae-Woo Kim
Affiliation:
CEOU/Department of Physics and Astronomy, Seoul National University, Korea, email: [email protected]
Jennifer Lotz
Affiliation:
STScI, Baltimore, USA
Conor McPartland
Affiliation:
IfA, University of Hawaii, Honolulu, USA
Michael Peth
Affiliation:
Department of Physics and Astronomy, Johns Hopkins University, Baltimore, USA
Anton Koekemoer
Affiliation:
STScI, Baltimore, USA
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Abstract

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At local, galaxy properties are well known to be clearly different in different environments. However, it is still an open question how this environment-dependent trend has been shaped. We present the results of our investigation about the evolution of star-formation properties of galaxies over a wide redshift range, from z ~ 2 to z ~ 0.5, focusing its dependence on their stellar mass and environment (Lee et al. 2015). In the UKIDSS/UDS region, covering ~2800 square arcmin, we estimated photometric redshifts and stellar population properties, such as stellar masses and star-formation rates, using the deep optical and near-infrared data available in this field. Then, we identified galaxy cluster candidates within the given redshift range. Through the analysis and comparison of star-formation (SF) properties of galaxies in clusters and in field, we found interesting results regarding the evolution of SF properties of galaxies: (1) regardless of redshifts, stellar mass is a key parameter controlling quenching of star formation in galaxies; (2) At z < 1, environmental effects become important at quenching star formation regardless of stellar mass of galaxies; and (3) However, the result of the environmental quenching is prominent only for low mass galaxies (M* < 1010 M⊙) since the star formation in most of high mass galaxies are already quenched at z > 1.

Keywords

galaxies: clusters: generalgalaxies: high-redshiftgalaxies: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S319: Galaxies at High Redshift and Their Evolution Over Cosmic Time , August 2015 , pp. 28
Copyright
Copyright © International Astronomical Union 2016 

References

Lee, S.-K., Im, M., Kim, J.-W., Lotz, J., McPartland, C., Peth, M., & Koekemoer, A. 2015, ApJ, 810, 90 Google Scholar