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Characterizing stellar halo populations II: the age gradient in blue horizontal-branch stars

Abstract:

The distribution of Milky Way halo blue horizontal-branch (BHB) stars is examined using action-based extended distribution functions (EDFs) that describe the locations of stars in phase space, metallicity, and age. The parameters of the EDFs are fitted using stars observed in the Sloan Extension for Galactic Understanding and Exploration-II (SEGUE-II) survey that traces the phase-space kinematics and chemistry out to ∼70 kpc. A maximum a posteriori probability (MAP) estimate method and a Mark...

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Publication status:
Published
Peer review status:
Peer reviewed
Version:
Publisher's version

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Publisher copy:
10.1093/mnras/stw2167

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Department:
Oxford, MPLS, Physics, Theoretical Physics
Williams, A More by this author
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Department:
Oxford, MPLS, Physics, Theoretical Physics
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Grant:
(FP7/2007-2013)/ERC grant agreement no.321067
Publisher:
Oxford University Press Publisher's website
Journal:
Monthly Notices of the Royal Astronomical Society Journal website
Volume:
463
Issue:
3
Pages:
3169-3185
Publication date:
2016-08-26
Acceptance date:
2016-08-24
DOI:
ISSN:
0035-8711 and 1365-2966
Pubs id:
pubs:659226
URN:
uri:c5ca3abe-6c21-4043-8bdf-2ca79012ecfd
UUID:
uuid:c5ca3abe-6c21-4043-8bdf-2ca79012ecfd
Local pid:
pubs:659226

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