Sgr dSph: a bridge between Dwarf Galaxies and DLAs?

Details Sgr dSph: a bridge between Dwarf Galaxies and DLAs? Sgr dSph: a bridge between Dwarf Galaxies and DLAs?

2003-09-03

arxiv.org/abs/astro-ph/0309121v1

Astronomy and Astrophysics

Astrophysics

Poster presented at IAU JD 15, Sidney, July 22, 2003

Scientific paper

We present abundances for 12 giants in the Sagittarius Dwarf Spheroidal Galaxy (Sgr dSph) obtained from VLT - UVES spectra. Moving on a short period, polar orbit around the Milky Way, the Sgr dSph is undergoing tidal disruption and will eventually dissolve in the Halo.Our sample is dominated by a metal rich, alpha-element-poor population, indicative of long chemical processing of the dSph gas during a slow, probably bursting star formation history. This population is the most metal-rich ever observed in a Dwarf Galaxy of the Local Group, and has the lowest alpha-element content. Placing the known abundances of the LG dwarfs on the [alpha/Fe] vs. [Fe/H] plane allows now to recognize a well defined evolutive sequence, different from the one followed by the MW disk stars, but apparently superimposed to the one followed by many of the Damped Lyman Alpha systems.

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