Transition Dwarf Galaxies in Nearby Groups of Galaxies

Details Transition Dwarf Galaxies in Nearby Groups of Galaxies Transition Dwarf Galaxies in Nearby Groups of Galaxies

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..421..145c&link_type=abstract

Galaxies in Isolation: Exploring Nature Versus Nurture, proceedings of a conference held 12 to 15 May 2009 in Granada, Spain. Ed

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Dwarf irregular galaxies (dIs) in the nearby Centaurus A Group have been imaged in Hα. We find that the dI star formation rates do not show any correlation with the distance of the dI to the nearest large galaxy of the group. There is a clear morphology-density relation in the Centaurus A Group, Sculptor Group, and Local Group, in the sense that dEs/dSphs tend to be at small distances from the more massive galaxies of the group, while dIs are on average at larger distances. We find transition dwarfs in both Groups, dwarfs that show characteristics of both dE/dSphs and dIs. Interestingly the transition dwarfs have an average distance to the more massive galaxies which is intermediate between those of the dEs/dSphs and dIs, and which is quite large: 0.54 ± 0.31 Mpc. This large distance poses some difficulty for the most popular scenarios proposed for transforming a dI into a dE/dSph.

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