Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ap%26ss.334..261k&link_type=abstract
Astrophysics and Space Science, Volume 334, Issue 2, pp.261-265
Astronomy and Astrophysics
Astrophysics
Galaxy: Halo, Galaxy: Structure, Galaxies: Dwarf, Galaxies: Formation
Scientific paper
Recent observational studies have discovered very small dwarf spheroidal galaxies (dSphs) which are the faintest member of the local group of galaxies. This paper examines their faintness because of the following reason: Comparing their M/ L (mass-luminosity ratio) to that of the other normal dSphs, we find very small dSphs are faint for their dark matter mass. This indicates their star formation is suppressed. There are two possibilities for the suppression: (1) ram pressure of IGM (intra-group medium), (2) wind from the Milky Way (MW). Owing to the ram pressure, interstellar medium of very small dSphs is possible to be stripped because of the shallowness of their gravitational potential. That is, star formation can be terminated during their evolution. However, the latter is difficult at the moment since their distance is far from MW. The author suggests star formation was terminated only when very small dSphs were beside MW whose wind was strong.
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