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Mapping the Remote Milky Way Halo using BHB stars at 70 < r < 130 kpc

Published online by Cambridge University Press:  26 May 2016

L. Clewley ,
S. J. Warren ,
P. Hewett ,
M. Wilkinson  and
N. W. Evans
L. Clewley
Affiliation:
Department of Physics, Denys Wilkinson Bldg., University of Oxford, Keble Road, Oxford OX1 3RH, UK
S. J. Warren
Affiliation:
Blackett Laboratory, Imperial College of Science Technology and Medicine, Prince Consort Rd, London SW7 2BW, UK
P. Hewett
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
M. Wilkinson
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
N. W. Evans
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK

Abstract

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We increase the number of remote halo tracers by using blue horizontal branch (BHB) stars out to Galactocentric distances of 130 kpc. We use SDSS EDR photometry and the VLT to detect 16 BHB stars at Galactocentric distances 70 <r < 130 kpc, and to measure their radial velocities. We find the mass of the Milky Way is M = 1.7+3.0–0.6 × 1012M⊙. When completed this survey will: (i) substantially reduce the errors in the total mass and extent of the Milky Way halo, and (ii) map the velocity space in a hitherto unexplored region of the halo.

Type
Part 6: The Galaxy
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 209 - 210
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

Clewley, L. 2002, PhD thesis, University of London.Google Scholar
Clewley, L., Warren, S. J., Hewett, P. C., Norris, J. E., Peterson, R. C., & Evans, N. W. 2002, MNRAS, 337, 87.CrossRefGoogle Scholar
Wilkinson, M., & Evans, N. 1999, MNRAS, 310, 645.CrossRefGoogle Scholar