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Stellar over-densities in the halo: the extent of the Virgo over-density

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arxiv 0901.2145 v1 pith:XENOZ4IT submitted 2009-01-14 astro-ph.GA

Stellar over-densities in the halo: the extent of the Virgo over-density

classification astro-ph.GA
keywords degreesover-densityvirgoextentfeaturesinformationlyraeprojected
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We map the three dimensional extent of the Virgo Over-density by combining distance information from RR Lyrae variables and projected spatial information from SEKBO (Keller et al. 2008) and Sloan Digital Sky Survey (SDSS) DR6 photometry. The Virgo Over-density is seen to comprise two filaments 14.5 x 3 degrees and 10 x 3 degrees and a circular structure 3 degrees in diameter. Together the three features span 38 degrees of right ascension and declinations of +2 to -15 degrees. RR Lyrae variables place the two filamentary features at heliocentric distances of 20 and 17 kpc respectively, with projected dimensions of 5 x 1 kpc and 3 x 1 kpc.

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