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Resolved Stellar Halos of M87 and NGC 5128: Metallicities from the Red-Giant Branch

Published online by Cambridge University Press:  09 May 2016

Sarah A. Bird
Sarah A. Bird*
Affiliation:
LAMOST Fellow, Shanghai Astronomical Observatory, 80 Nandan Road, Shanghai, 200030, China, email: sarahbird@shao.ac.cn
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Abstract

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We have searched halo fields of two giant elliptical galaxies: M87, using HST images at 10 kpc from the galactic center, and NGC 5128 (Cen A), using VIMOS VLT images at 65 kpc from the center and archival HST data from 8 to 38 kpc from the center. We have resolved thousands of red-giant-branch (RGB) stars in these stellar halo fields using V and I filters, and, in addition, measured the metallicity using stellar isochrones. The metallicity distribution function (MDF) of the inner stellar halo of M87 is similar to that of NGC 5128's stellar halo.

Keywords

galaxies: halogalaxies: ellipticalgalaxies: stellar contentgalaxies: individual: M87galaxies: individual: NGC 5128
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Issue S317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution , August 2015 , pp. 276 - 277
Copyright
Copyright © International Astronomical Union 2016 

References

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