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Enhancing and inhibiting star formation: high-resolution simulation studies of the impact of cold accretion, mergers and feedback on individual massive galaxies

Published online by Cambridge University Press:  17 July 2013

Leila C. Powell ,
Frederic Bournaud ,
Damien Chapon ,
Julien Devriendt ,
Volker Gaibler ,
Sadegh Khochfar ,
Adrianne Slyz  and
Romain Teyssier
Leila C. Powell
Affiliation:
Max Planck Institute for extraterrestrial Physics, PO Box 1312, Giessenbachstr., 85741 Garching, Germany email: lpowell@mpe.mpg.de
Frederic Bournaud
Affiliation:
Service d'astrophysique, CEA, Orme des Merisiers, Gif-sur-Yvette Cedex, France
Damien Chapon
Affiliation:
Service d'astrophysique, CEA, Orme des Merisiers, Gif-sur-Yvette Cedex, France
Julien Devriendt
Affiliation:
Oxford astrophysics, Denys Wilkinson Building, Keble Road, OX1 3RH
Volker Gaibler
Affiliation:
Universität Heidelberg, Zentrum für Astronomie, Institut für Theoretische Astrophysik, Albert-Ueberle-Str. 2, 69120 Heidelberg, Germany
Sadegh Khochfar
Affiliation:
Max Planck Institute for extraterrestrial Physics, PO Box 1312, Giessenbachstr., 85741 Garching, Germany email: lpowell@mpe.mpg.de
Adrianne Slyz
Affiliation:
Oxford astrophysics, Denys Wilkinson Building, Keble Road, OX1 3RH
Romain Teyssier
Affiliation:
Service d'astrophysique, CEA, Orme des Merisiers, Gif-sur-Yvette Cedex, France
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Abstract

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The quest for a better understanding of the evolution of massive galaxies can be broadly summarised with 2 questions: how did they build up their large (stellar) masses and what eventually quenched their star formation (SF)? To tackle these questions, we use high-resolution ramses simulations (Teyssier 2002) to study several aspects of the detailed interplay between accretion (mergers and cold flows), SF and feedback in individual galaxies. We examine SF in major mergers; a process crucial to stellar mass assembly. We explore whether the merger-induced, clustered SF is as important a mechanism in average mergers, as it is in extreme systems like the Antennae. We find that interaction-induced turbulence drives up the velocity dispersion, and that there is a correlated rise in SFR in all our simulated mergers as the density pdf evolves to have an excess of very dense gas. Next, we introduce a new study into whether mechanical jet feedback can impact upon the ability of hot gas haloes to provide a supply of fuel for SF during mergers and in their remnants. Finally, we briefly review our recent study, in which we examine the effect of supernova (SN) feedback on galaxies accreting via the previously overlooked cold-mode, by resimulating a stream-fed galaxy at z ~ 9. A far-reaching galactic wind results yet it cannot suppress the cold, filamentary accretion or eject significant mass in order to reduce the SFR, suggesting that SN feedback may not be as effective as is often assumed.

Keywords

methods: numericalgalaxies: evolutiongalaxies: star clustersgalaxies: interactionsgalaxies: high-redshiftgalaxies: starburstgalaxies: jetsstars: supernovae: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S295: The intriguing life of massive galaxies , August 2012 , pp. 13 - 16
Copyright
Copyright © International Astronomical Union 2013 

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