Journal Article

Stellar overdensities in the halo: the extent of the Virgo overdensity*

Stefan C. Keller, Gary S. Da Costa and Sayuri L. Prior

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 394, issue 2, pages 1045-1050
Published in print April 2009 | ISSN: 0035-8711
Published online March 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14393.x
Stellar overdensities in the halo: the extent of the Virgo overdensity*

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We map the three-dimensional extent of the Virgo overdensity by combining distance information from RR Lyrae variables and projected spatial information from the Southern Edgeworth–Kuiper Belt Object Survey and Sloan Digital Sky Survey Data Release 6 photometry. The Virgo overdensity is seen to comprise two filaments and 10°× 3°, and a circular structure 3° in diameter. Together, the three features span 38° of right ascension and declinations of 2° to −15°. RR Lyrae variables place the two filamentary features at heliocentric distances of 20 and 17 kpc, respectively, with projected dimensions of 5 × 1 and 3 × 1 kpc.

Keywords: Galaxy: halo; Galaxy: structure

Journal Article.  4602 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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