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Evidence of Environmental Quenching at Redshift z ≈ 2

Ji, Zhiyuan and Giavalisco, Mauro and Williams, Christina C. and Faber, Sandra M. and Ferguson, Henry C. and Guo, Yicheng and Liu, Teng and Lee, Bomee (2018) Evidence of Environmental Quenching at Redshift z ≈ 2. Astrophysical Journal, 862 (2). Art. No. 135. ISSN 1538-4357. doi:10.3847/1538-4357/aacc2c.

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We report evidence of environmental quenching among galaxies at redshifts of ≈2, namely the probability that a galaxy quenches its star formation activity is enhanced in the regions of space in proximity of other quenched, more massive galaxies. The effect is observed as strong clustering of quiescent galaxies around quiescent galaxies on angular scales of θ ≤ 20 arcsec, corresponding to a proper (comoving) scale of 168 (502) kpc at z = 2. The effect is observed only for quiescent galaxies around other quiescent galaxies; the probability to find star-forming galaxies around quiescent or around star-forming ones is consistent with the clustering strength of galaxies of the same mass and at the same redshift, as observed in dedicated studies of galaxy clustering. The effect is mass dependent in the sense that the quenching probability is stronger for galaxies of smaller masses (M*< 10^(10) M☉) than for more massive ones, i.e., it follows the opposite trend with mass relative to gravitational galaxy clustering. The spatial scale where the effect is observed suggests that these environments are massive halos, in which case the observed effect would likely be satellite quenching. The effect is also redshift dependent in that the clustering strength of quiescent galaxies around other quiescent galaxies at z = 1.6 is ≈1.7× larger than that of the galaxies with the same stellar mass at z = 2.6. This redshift dependence allows for a crude estimate of the timescale of environmental quenching of low-mass galaxies, which is in the range of 1.5 ~ 4 Gyr, in broad agreement with other estimates and with our ideas on satellite quenching.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Ji, Zhiyuan0000-0001-7673-2257
Giavalisco, Mauro0000-0002-7831-8751
Williams, Christina C.0000-0003-2919-7495
Faber, Sandra M.0000-0003-4996-214X
Ferguson, Henry C.0000-0001-7113-2738
Guo, Yicheng0000-0003-2775-2002
Liu, Teng0000-0002-2941-6734
Lee, Bomee0000-0003-1954-5046
Additional Information:© 2018 The American Astronomical Society. Received 2017 June 2; revised 2018 May 2; accepted 2018 June 10; published 2018 July 31. We thank the anonymous referee for useful comments. The authors acknowledge that the support for HST Programs GO-12060 and GO-12099 was provided by NASA through grants from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NASA Hubble Space TelescopeGO-12060
NASA Hubble Space TelescopeGO-12099
Subject Keywords:cosmology: observations – galaxies: evolution – galaxies: high-redshift
Issue or Number:2
Record Number:CaltechAUTHORS:20180809-111015695
Persistent URL:
Official Citation:Zhiyuan Ji et al 2018 ApJ 862 135
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88694
Deposited By: Tony Diaz
Deposited On:09 Aug 2018 18:18
Last Modified:16 Nov 2021 00:29

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