The global warming of group satellite galaxies

C. Yozin, K. Bekki

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.Recent studies adopting ?Re, a proxy for specific angular momentum, have highlighted how early-type galaxies (ETGs) are composed of two kinematical classes for which distinct formation mechanisms can be inferred. With upcoming surveys expected to obtain ?Re from a broad range of environments (e.g. SAMI, MaNGA), we investigate in this numerical study how the ?Re-ee distribution of fast-rotating dwarf satellite galaxies reflects their evolutionary state. By combining N-body/SPH simulations of progenitor disc galaxies (stellar mass ? 109 M?), their cosmologically-motivated sub-halo infall history and a characteristic group orbit/potential, we demonstrate the evolution of a satellite ETG population driven by tidal interactions (e.g. harassment). As a general result, these satellites remain intrinsically fast-rotating oblate stellar systems since their infall as early as z = 2; mis-identifications as slow rotators often arise due to a bar/spiral lifecycle which plays an integral role in their evolution. Despite the idealistic nature of its construction, our mock ?Re-ee distribution at z <0.1 reproduces its observational counterpart from the ATLAS3D/SAURON projects. We predict therefore how the observed ?Re-ee distribution of a group evolves according to these ensemble tidal interactions.
Original languageEnglish
Pages (from-to)3968-3974
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume460
Issue number4
DOIs
Publication statusPublished - 2016

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global warming
galaxies
population type
stellar systems
disk galaxies
formation mechanism
stellar mass
angular momentum
halos
histories
interactions
orbits
history
simulation
distribution

Cite this

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title = "The global warming of group satellite galaxies",
abstract = "{\circledC} 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.Recent studies adopting ?Re, a proxy for specific angular momentum, have highlighted how early-type galaxies (ETGs) are composed of two kinematical classes for which distinct formation mechanisms can be inferred. With upcoming surveys expected to obtain ?Re from a broad range of environments (e.g. SAMI, MaNGA), we investigate in this numerical study how the ?Re-ee distribution of fast-rotating dwarf satellite galaxies reflects their evolutionary state. By combining N-body/SPH simulations of progenitor disc galaxies (stellar mass ? 109 M?), their cosmologically-motivated sub-halo infall history and a characteristic group orbit/potential, we demonstrate the evolution of a satellite ETG population driven by tidal interactions (e.g. harassment). As a general result, these satellites remain intrinsically fast-rotating oblate stellar systems since their infall as early as z = 2; mis-identifications as slow rotators often arise due to a bar/spiral lifecycle which plays an integral role in their evolution. Despite the idealistic nature of its construction, our mock ?Re-ee distribution at z <0.1 reproduces its observational counterpart from the ATLAS3D/SAURON projects. We predict therefore how the observed ?Re-ee distribution of a group evolves according to these ensemble tidal interactions.",
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language = "English",
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The global warming of group satellite galaxies. / Yozin, C.; Bekki, K.

In: Monthly Notices of the Royal Astronomical Society, Vol. 460, No. 4, 2016, p. 3968-3974.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The global warming of group satellite galaxies

AU - Yozin, C.

AU - Bekki, K.

PY - 2016

Y1 - 2016

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AB - © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.Recent studies adopting ?Re, a proxy for specific angular momentum, have highlighted how early-type galaxies (ETGs) are composed of two kinematical classes for which distinct formation mechanisms can be inferred. With upcoming surveys expected to obtain ?Re from a broad range of environments (e.g. SAMI, MaNGA), we investigate in this numerical study how the ?Re-ee distribution of fast-rotating dwarf satellite galaxies reflects their evolutionary state. By combining N-body/SPH simulations of progenitor disc galaxies (stellar mass ? 109 M?), their cosmologically-motivated sub-halo infall history and a characteristic group orbit/potential, we demonstrate the evolution of a satellite ETG population driven by tidal interactions (e.g. harassment). As a general result, these satellites remain intrinsically fast-rotating oblate stellar systems since their infall as early as z = 2; mis-identifications as slow rotators often arise due to a bar/spiral lifecycle which plays an integral role in their evolution. Despite the idealistic nature of its construction, our mock ?Re-ee distribution at z <0.1 reproduces its observational counterpart from the ATLAS3D/SAURON projects. We predict therefore how the observed ?Re-ee distribution of a group evolves according to these ensemble tidal interactions.

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