On the nature of the stellar bridge between Leo IV and Leo V

Details On the nature of the stellar bridge between Leo IV and Leo V On the nature of the stellar bridge between Leo IV and Leo V

2012-01-25

arxiv.org/abs/1201.5399v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

4 pages, 2 figures; to appear in the proceedings of the Subaru conference on Galactic Archaeology, Shuzenji, Japan (Nov. 1-4 2

Scientific paper

We present a revised analysis of a speculated stellar bridge between the Milky Way dwarf galaxies Leo IV and Leo V. Using data acquired with Subaru/Suprime-Cam over a 1deg x 4deg field encompassing the two satellites and the region in between, we confirm our previous detection of a stellar overdensity between Leo IV and Leo V (de Jong et al. 2010). The larger area coverage and improved depth of our current dataset allow for an improved analysis of the stellar overdensity that had previously appeared to bridge the two galaxies. A main-sequence turn-off feature visible in the stacked colour-magnitude diagram of the contiguously observed Subaru fields reveals an extended stellar structure at a distance of approximately 20 kpc. Its angular proximity to the Virgo overdensity, as well as a good correspondence in distance and metallicity, suggests that the smaller structure we detect may be associated with the much larger Virgo stellar overdensity.

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