Ram Pressure Stripping Of An Isolated Local Group Dwarf Galaxy: Evidence For An Intra-group Medium

Details Ram Pressure Stripping Of An Isolated Local Group Dwarf Galaxy: Evidence For An Intra-group Medium Ram Pressure Stripping Of An Isolated Local Group Dwarf Galaxy: Evidence For An Intra-group Medium

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1605m&link_type=abstract

American Astronomical Society, AAS Meeting #211, #16.05; Bulletin of the American Astronomical Society, Vol. 39, p.767

Astronomy and Astrophysics

Astronomy

Scientific paper

We compare the stellar structure of the isolated, Local Group dwarf galaxy Pegasus (DDO216) with low resolution HI maps from Young et al. (2003). Our comparison reveals that Pegasus displays the characteristic morphology of ram pressure stripping; in particular, the HI has a "cometary'' appearance which is not reflected in the regular, elliptical distribution of the stars. This is the first time this phenomenon has been observed in an isolated Local Group galaxy. The density of the medium required to ram pressure strip Pegasus is approximately 10-5 - 10 -6cm-3. We conclude that this is strong evidence for an inter-galactic medium associated with the Local Group.

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