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  Quenching Low-mass Satellite Galaxies: Evidence for a Threshold ICM Density

Roberts, I. D., Parker, L. C., Brown, T., Joshi, G. D., Hlavacek-Larrondo, J., & Wadsley, J. (2019). Quenching Low-mass Satellite Galaxies: Evidence for a Threshold ICM Density. The Astrophysical Journal, 873.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CFEA-B Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CFEB-A
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2019ApJ...873...42R (Any fulltext)
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 Creators:
Roberts, Ian D.1, Author
Parker, Laura C.1, Author
Brown, Toby1, Author
Joshi, Gandhali D.1, Author
Hlavacek-Larrondo, Julie1, Author
Wadsley, James1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: clusters: general galaxies: clusters: intracluster medium galaxies: evolution galaxies: star formation X-rays: galaxies: clusters Astrophysics - Astrophysics of Galaxies
 Abstract: We compile a sample of Sloan Digital Sky Survey (SDSS) galaxy clusters with high-quality Chandra X-ray data to directly study the influence of the dense intracluster medium (ICM) on the quenching of satellite galaxies. We study the quenched fractions of satellite galaxies as a function of ICM density for low- (109 ‚â≤ M ‚ãÜ ‚â≤ 1010 M ‚òâ), intermediate- (1010 ‚â≤ M ‚ãÜ ‚â≤ 1010.5 M ‚òâ), and high-mass (M ‚ãÜ ‚â≥ 1010.5 M ‚òâ) satellite galaxies with >3000 satellite galaxies across 24 low-redshift (z < 0.1) clusters. For low-mass galaxies we find evidence for a broken power-law trend between satellite quenched fraction and local ICM density. The quenched fraction increases modestly at ICM densities below a threshold before increasing sharply beyond this threshold toward the cluster center. We show that this increase in quenched fraction at high ICM density is well matched by a simple, analytic model of ram pressure stripping. These results are consistent with a picture where low-mass cluster galaxies experience an initial, slow-quenching mode driven by steady gas depletion, followed by rapid quenching associated with ram pressure of cold-gas stripping near (one-quarter of the virial radius, on average) the cluster center.

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 Dates: 2019
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 873 Sequence Number: - Start / End Page: - Identifier: -