In Situ Measurement of the Metallicity Gradient in the Galactic Halo

Details In Situ Measurement of the Metallicity Gradient in the Galactic Halo In Situ Measurement of the Metallicity Gradient in the Galactic Halo

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21922203h&link_type=abstract

American Astronomical Society, AAS Meeting #219, #222.03

Astronomy and Astrophysics

Astronomy

Scientific paper

The metallicity gradient in the Milky Way halo is a controversial topic: early studies such as that of Zinn (1985) found no gradient outside the solar radius, while the recent work of Carollo et al (2007), who used orbital properties of local halo stars to infer the metallicity of the outer halo, claims a strong negative gradient, with the outer halo significantly more metal poor than the local halo. This measurement is important for the constraints it will give us on the balance between in situ halo formation and accretion of halo stars, and also for constraints on the assembly history of the dark halo. I will discuss a large sample of in situ halo stars (K giants found by SEGUE) which stretches into the far outer halo, removing the necessity for extrapolating from local stars.

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