The impact of gas stripping and stellar mass loss on satellite galaxy evolution

Taysun Kimm, Sukyoung Yi, Sadegh Khochfar

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Current semi-analytic models of galaxy formation overpredict the fraction of passive small late-type satellite galaxies in dense environments by a factor of two to three. We hypothesize that this is due to inaccurate prescriptions on cold gas evolution. In the hope of solving this problem, we apply detailed prescriptions on the evolution of diffuse hot gases in satellites and on stellar mass loss, both of which are critical in modeling cold gas evolution. We replace the conventional shock-heating motivated instant stripping with a realistic gradual prescription based on ram pressure and tidal stripping. We also carefully consider stellar mass loss in our model. When both mechanisms are included, the fraction of passive late types matches the data much more closely. However, the satellite over-quenching problem is still present in small galaxies in massive halos. In terms of the detectable residual star formation rates, gradual diffuse gas stripping appears to be much more important than stellar mass loss in our model. The implications of these results and other possibilities, such as redshift-dependent merging geometry and tidal disruption, are also discussed.

Original languageEnglish
Article number11
JournalAstrophysical Journal
Volume729
Issue number1
DOIs
Publication statusPublished - 2011 Mar 1

Fingerprint

stripping
stellar mass
gas evolution
cold gas
galaxies
gases
gas
shock heating
ram
problem solving
galactic evolution
high temperature gases
star formation rate
halos
quenching
geometry
heating
loss
modeling
prescription

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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The impact of gas stripping and stellar mass loss on satellite galaxy evolution. / Kimm, Taysun; Yi, Sukyoung; Khochfar, Sadegh.

In: Astrophysical Journal, Vol. 729, No. 1, 11, 01.03.2011.

Research output: Contribution to journalArticle

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