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Revealing environmental dependence of molecular gas content in a distant X-ray cluster at z=2.51

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Version 2 2023-06-12, 07:31
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journal contribution
posted on 2023-06-12, 07:31 authored by Tao Wang, David Elbaz, Emanuele Daddi, Daizhong Liu, Tadayuki Kodama, Ichi Tanaka, Corentin Schreiber, Anita Zanella, Francesco Valentino, Mark Sargent, Kotaro Kohno, Mengyuan Xiao, Maurilio Pannella, Laure Cisela, Raphael Gobat, Yusei Koyama
We present a census of the molecular gas properties of galaxies in the most distant known X-ray cluster, CLJ1001, at z=2.51, using deep observations of CO(1-0) with JVLA. In total 14 cluster members with M*>1010.5M? are detected, including all the massive star-forming members within the virial radius, providing the largest galaxy sample in a single cluster at z>2 with CO(1-0) measurements. We find a large variety in the gas content of these cluster galaxies, which is correlated with their relative positions (or accretion states), with those closer to the cluster core being increasingly gas-poor. Moreover, despite their low gas content, the galaxies in the cluster center exhibit an elevated star formation efficiency (SFE=SFR/Mgas) compared to field galaxies, suggesting that the suppression on the SFR is likely delayed compared to that on the gas content. Their gas depletion time is around tdep~400 Myrs, comparable to the cluster dynamical time. This implies that they will likely consume all their gas within a single orbit around the cluster center, and form a passive cluster core by z~2. This result is one of the first direct pieces of evidence for the influence of environment on the gas reservoirs and SFE of z>2 cluster galaxies, thereby providing new insights into the rapid formation and quenching of the most massive galaxies in the early universe.

History

Publication status

  • Published

File Version

  • Published version

Journal

Astrophysical Journal

ISSN

0004-637X

Publisher

American Astronomical Society

Issue

2

Volume

867

Page range

1-7

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Astronomy Centre Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-11-28

First Open Access (FOA) Date

2018-11-28

First Compliant Deposit (FCD) Date

2018-11-27

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