Journal article
Environmental quenching and galactic conformity in the galaxy cross-correlation signal
- Abstract:
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It has long been known that environment has a large effect on star formation in galaxies. There are several known plausible mechanisms to remove the cool gas needed for star formation, such as strangulation, harassment and ram-pressure stripping. It is unclear which process is dominant, and over what range of stellar mass. In this paper, we find evidence for suppression of the cross-correlation function between massive galaxies and less massive star-forming galaxies, giving a measure of how less likely a galaxy is to be star-forming in the vicinity of a more massive galaxy. We develop a formalism for modelling environmental quenching mechanisms within the Halo Occupation Distribution formalism. We find that at $z \sim 2$ environment is not a significant factor in determining quenching of star-forming galaxies, and that galaxies are quenched with similar probabilities in group environments as they are globally. However, by $z \sim 0.5$ galaxies are much less likely to be star forming when in a group environment than when not. This increased probability of being quenched does not appear to have significant radial dependence within the halo, supportive of the quenching being caused by the halting of fresh inflows of pristine gas, as opposed to by tidal stripping. Furthermore, by separating the massive sample into passive and star-forming, we see that this effect is further enhanced when the central galaxy is passive. This effect is present only in the 1-halo term (within a halo) at high redshifts ($z>1$), but is apparent in the 2-halo term at lower redshifts ($z<1$), a manifestation of galactic conformity.
- Publication status:
- Accepted
- Peer review status:
- Peer reviewed
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- Files:
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(Preview, Accepted manuscript, pdf, 2.1MB, Terms of use)
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- Publisher copy:
- 10.1093/mnras/stx2155
Authors
- Publisher:
- Oxford University Press
- Journal:
- Monthly Notices of the Royal Astronomical Society More from this journal
- Publication date:
- 2017-08-22
- Acceptance date:
- 2017-08-18
- DOI:
- EISSN:
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1365-2966
- ISSN:
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0035-8711
- Keywords:
- Pubs id:
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pubs:631441
- UUID:
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uuid:49253785-210e-44a7-a274-5a79e8c87498
- Local pid:
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pubs:631441
- Source identifiers:
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631441
- Deposit date:
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2017-08-21
Terms of use
- Copyright holder:
- Hatfield et al
- Copyright date:
- 2017
- Notes:
- This is the author accepted manuscript following peer review version of the article. The final version is available online from Oxford University Press (OUP) at: https://doi.org/10.1093/mnras/stx2155
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