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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 358823.0, MPI für Astronomie / Publikationen_mpia
The Hercules-Aquila cloud
Authors:Belokurov, V.; Evans, N. W.; Bell, E. F.; Irwin, M. J.; Hewett, P. C.; Koposov, S.; Rockosi, C. M.; Gilmore, G.; Zucker, D. B.; Fellhauer, M.; Wilkinson, M. I.; Bramich, D. M.; Vidrih, S.; Rix, H. W.; Beers, T. C.; Schneider, D. P.; Barentine, J. C.; Brewington, H.; Brinkmann, J.; Harvanek, M.; Krzesinski, J.; Long, D.; Pan, K.; Snedden, S. A.; Malanushenko, O.; Malanushenko, V.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:The Astrophysical Journal
Start Page:L89
End Page:L92
Audience:Not Specified
Abstract / Description:We present evidence for a substantial overdensity of stars in the direction of the constellations of Hercules and Aquila. The cloud is centered at a Galactic longitude of l~40deg and extends above and below the Galactic plane by at least 50°. Given its off-centeredness and height, it is unlikely that the Hercules-Aquila cloud is related to the bulge or thick disk. More likely, this is a new structural component of the Galaxy that passes through the disk. The cloud stretches ~80° in longitude. Its heliocentric distance lies between 10 and 20 kpc so that the extent of the cloud in projection is ~20 kpc by ~15 kpc. It has an absolute magnitude of Mv=-13, and its stellar population appears to be comparable to, but somewhat more metal-rich than, M92.
Free Keywords:Galaxies: Kinematics and Dynamics; Galaxies: Structure; Galaxy: Halo; Galaxies: Local Group
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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