Giant Halos in Dwarf Irregular Galaxies vs. Dwarf Elliptical Galaxies

Details Giant Halos in Dwarf Irregular Galaxies vs. Dwarf Elliptical Galaxies Giant Halos in Dwarf Irregular Galaxies vs. Dwarf Elliptical Galaxies

2005-10-28

arxiv.org/abs/astro-ph/0510801v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, proceedings of IAU Colloquium 198, "Near-Field Cosmology With Dwarf Elliptical Galaxies", editors H. Jerje

Scientific paper

10.1017/S1743921305003716

We present a discovery of a giant stellar halo in NGC 6822, a dwarf irregular galaxy in the Local Group. This halo is mostly made of old red giants, showing striking features: 1) it is several times larger than the main body of the galaxy seen in the optical images, and 2) it is elongated in the direction almost perpendicular to the HI disk of NGC 6822. The structure of this stellar halo looks similar to the shape of dwarf elliptical galaxies, indicating that the halos of dwarf irregular galaxies share the same origin with those of the dwarf elliptical galaxies.

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