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Disruption of satellite galaxies in simulated groups and clusters: the roles of accretion time, baryons, and pre-processing

Bahé, Yannick M; Schaye, Joop; Barnes, David J; Dalla Vecchia, Claudio; Kay, Scott T; Bower, Richard G; Hoekstra, Henk; McGee, Sean L; Theuns, Tom

Disruption of satellite galaxies in simulated groups and clusters: the roles of accretion time, baryons, and pre-processing Thumbnail


Authors

Yannick M Bahé

Joop Schaye

David J Barnes

Claudio Dalla Vecchia

Scott T Kay

Richard G Bower

Henk Hoekstra

Sean L McGee



Abstract

We investigate the disruption of group and cluster satellite galaxies with total mass (dark matter plus baryons) above 1010M⊙ in the Hydrangea simulations, a suite of 24 high-resolution cosmological hydrodynamical zoom-in simulations based on the EAGLE model. The simulations predict that ∼50 per cent of satellites survive to redshift z = 0, with higher survival fractions in massive clusters than in groups and only small differences between baryonic and pure N-body simulations. For clusters, up to 90 per cent of galaxy disruption occurs in lower-mass subgroups (i.e. during pre-processing); 96 per cent of satellites in massive clusters that were accreted at z < 2 and have not been pre-processed survive. Of those satellites that are disrupted, only a few per cent merge with other satellites, even in low-mass groups. The survival fraction changes rapidly from less than 10 per cent of those accreted at high z to more than 90 per cent at low z⁠. This shift, which reflects faster disruption of satellites accreted at higher z⁠, happens at lower z for more massive galaxies and those accreted on to less massive haloes. The disruption of satellite galaxies is found to correlate only weakly with their pre-accretion baryon content, star formation rate, and size, so that surviving galaxies are nearly unbiased in these properties. These results suggest that satellite disruption in massive haloes is uncommon, and that it is predominantly the result of gravitational rather than baryonic processes.

Citation

Bahé, Y. M., Schaye, J., Barnes, D. J., Dalla Vecchia, C., Kay, S. T., Bower, R. G., …Theuns, T. (2019). Disruption of satellite galaxies in simulated groups and clusters: the roles of accretion time, baryons, and pre-processing. Monthly Notices of the Royal Astronomical Society, 485(2), 2287-2311. https://doi.org/10.1093/mnras/stz361

Journal Article Type Article
Acceptance Date Jan 31, 2019
Online Publication Date Feb 15, 2019
Publication Date May 11, 2019
Deposit Date Mar 12, 2019
Publicly Available Date Mar 29, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 485
Issue 2
Pages 2287-2311
DOI https://doi.org/10.1093/mnras/stz361

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Copyright Statement
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.





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