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

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

2009-01-14

arxiv.org/abs/0901.2145v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

6 pages, 5 figures, MNRAS accepted

Scientific paper

10.1111/j.1365-2966.2009.14393.x

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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