CADIS has seen the Virgo overdensity and parts of the Monoceros and `Orphan' streams in retrospect

Details CADIS has seen the Virgo overdensity and parts of the Monoceros and `Orphan' streams in retrospect CADIS has seen the Virgo overdensity and parts of the Monoceros and `Orphan' streams in retrospect

2006-07-19

arxiv.org/abs/astro-ph/0607445v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, accepted as Research Note by Astron. Astrophys

Scientific paper

10.1051/0004-6361:20065698

We reanalyze deep star counts in five CADIS fields. The data are presented as vertical density distributions of stars perpendicular to the Galactic plane. In three fields the profiles are consistent with each other, while in two fields significant overdensities of stars are found. The overdensity in one field can be associated with the Virgo overdensity which can be traced right into the disk of the Milky Way. Using this detection we estimate the mass of the Virgo overdensity and show that this is equivalent to the stellar content of a Local Group dwarf spheroidal galaxy. The overdensity in the second field is more difficult to associate with a previously known overdensity. We suggest that it is related both to the Monoceros stream and the recently discovered Orphan stream.

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