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

2007-10-24

arxiv.org/abs/0710.4582v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, uses emulateapj.cls. Accepted for publication in ApJ Letters

Scientific paper

10.1086/524887

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 at least $10^{-5} - 10^{-6}$, cm$^{-3}$. We conclude that this is strong evidence for an inter-galactic medium associated with the Local Group.

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