Galaxy environments in the UKIDSS Ultra Deep Survey

R. W. Chuter; O. Almaini; W. G. Hartley; R. J. McLure; J. S. Dunlop; S. Foucaud; C. J. Conselice; C. Simpson; M. Cirasuolo; E. J. Bradshaw

doi:10.1111/j.1365-2966.2011.18241.x

Galaxy environments in the UKIDSS Ultra Deep Survey

R. W. Chuter, O. Almaini, W. G. Hartley, R. J. McLure, J. S. Dunlop, S. Foucaud, C. J. Conselice, C. Simpson, M. Cirasuolo, E. J. Bradshaw

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We present a study of galaxy environments to z similar to 2, based on a sample of over 33 000 K-band-selected galaxies detected in the UKIDSS Ultra Deep Survey (UDS). The combination of infrared depth and area in the UDS allows us to extend previous studies of galaxy environment to z > 1 without the strong biases associated with optical galaxy selection. We study the environments of galaxies divided by rest-frame (U - B) colours, in addition to 'passive' and 'star-forming' subsets based on template fitting. We find that galaxy colour is strongly correlated with galaxy overdensity on small scales (< 1-Mpc diameter), with red/passive galaxies residing in significantly denser environments than blue/star-forming galaxies to z similar to 1.5. On smaller scales (< 0.5-Mpc diameter) we also find a relationship between galaxy luminosity and environment, with the most luminous blue galaxies at z similar to 1 inhabiting environments comparable to red, passive systems at the same redshift. Monte Carlo simulations demonstrate that these conclusions are robust to the uncertainties introduced by photometric redshift errors.

Original language	English
Pages (from-to)	1678-1686
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	413
Issue number	3
DOIs	https://doi.org/10.1111/j.1365-2966.2011.18241.x
Publication status	Published - May 2011

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title = "Galaxy environments in the UKIDSS Ultra Deep Survey",

abstract = "We present a study of galaxy environments to z similar to 2, based on a sample of over 33 000 K-band-selected galaxies detected in the UKIDSS Ultra Deep Survey (UDS). The combination of infrared depth and area in the UDS allows us to extend previous studies of galaxy environment to z > 1 without the strong biases associated with optical galaxy selection. We study the environments of galaxies divided by rest-frame (U - B) colours, in addition to 'passive' and 'star-forming' subsets based on template fitting. We find that galaxy colour is strongly correlated with galaxy overdensity on small scales (< 1-Mpc diameter), with red/passive galaxies residing in significantly denser environments than blue/star-forming galaxies to z similar to 1.5. On smaller scales (< 0.5-Mpc diameter) we also find a relationship between galaxy luminosity and environment, with the most luminous blue galaxies at z similar to 1 inhabiting environments comparable to red, passive systems at the same redshift. Monte Carlo simulations demonstrate that these conclusions are robust to the uncertainties introduced by photometric redshift errors.",

author = "Chuter, {R. W.} and O. Almaini and Hartley, {W. G.} and McLure, {R. J.} and Dunlop, {J. S.} and S. Foucaud and Conselice, {C. J.} and C. Simpson and M. Cirasuolo and Bradshaw, {E. J.}",

year = "2011",

month = may,

doi = "10.1111/j.1365-2966.2011.18241.x",

language = "English",

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pages = "1678--1686",

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AU - Chuter, R. W.

AU - Almaini, O.

AU - Hartley, W. G.

AU - McLure, R. J.

AU - Dunlop, J. S.

AU - Foucaud, S.

AU - Conselice, C. J.

AU - Simpson, C.

AU - Cirasuolo, M.

AU - Bradshaw, E. J.

PY - 2011/5

Y1 - 2011/5

N2 - We present a study of galaxy environments to z similar to 2, based on a sample of over 33 000 K-band-selected galaxies detected in the UKIDSS Ultra Deep Survey (UDS). The combination of infrared depth and area in the UDS allows us to extend previous studies of galaxy environment to z > 1 without the strong biases associated with optical galaxy selection. We study the environments of galaxies divided by rest-frame (U - B) colours, in addition to 'passive' and 'star-forming' subsets based on template fitting. We find that galaxy colour is strongly correlated with galaxy overdensity on small scales (< 1-Mpc diameter), with red/passive galaxies residing in significantly denser environments than blue/star-forming galaxies to z similar to 1.5. On smaller scales (< 0.5-Mpc diameter) we also find a relationship between galaxy luminosity and environment, with the most luminous blue galaxies at z similar to 1 inhabiting environments comparable to red, passive systems at the same redshift. Monte Carlo simulations demonstrate that these conclusions are robust to the uncertainties introduced by photometric redshift errors.

AB - We present a study of galaxy environments to z similar to 2, based on a sample of over 33 000 K-band-selected galaxies detected in the UKIDSS Ultra Deep Survey (UDS). The combination of infrared depth and area in the UDS allows us to extend previous studies of galaxy environment to z > 1 without the strong biases associated with optical galaxy selection. We study the environments of galaxies divided by rest-frame (U - B) colours, in addition to 'passive' and 'star-forming' subsets based on template fitting. We find that galaxy colour is strongly correlated with galaxy overdensity on small scales (< 1-Mpc diameter), with red/passive galaxies residing in significantly denser environments than blue/star-forming galaxies to z similar to 1.5. On smaller scales (< 0.5-Mpc diameter) we also find a relationship between galaxy luminosity and environment, with the most luminous blue galaxies at z similar to 1 inhabiting environments comparable to red, passive systems at the same redshift. Monte Carlo simulations demonstrate that these conclusions are robust to the uncertainties introduced by photometric redshift errors.

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DO - 10.1111/j.1365-2966.2011.18241.x

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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ER -

Galaxy environments in the UKIDSS Ultra Deep Survey

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