Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-12-21
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
10 pages, 5 figures, accepted for publication in ApJ
Scientific paper
Current semi-analytic models (SAMs) of galaxy formation over-predict 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 to model 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. The satellite over-quenching problem is still present in small galaxies in massive haloes, however. 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.
Khochfar Sadegh
Kimm Taysun
Yi Sukyoung
No associations
LandOfFree
The Impact of Gas Stripping and Stellar Mass Loss on Satellite Galaxy Evolution does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Impact of Gas Stripping and Stellar Mass Loss on Satellite Galaxy Evolution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Impact of Gas Stripping and Stellar Mass Loss on Satellite Galaxy Evolution will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-95445