2007ApJ...657L..89B

Query : 2007ApJ...657L..89B

2007ApJ...657L..89B - Astrophys. J., 657, L89-L92 (2007/March-2)

The Hercules-Aquila cloud.

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. and MALANUSHENKO V.

Abstract (from CDS):

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~40° 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.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Kinematics and Dynamics - Galaxies: Structure - Galaxy: Halo - Galaxies: Local Group

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
2 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
3 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
4 NAME Hercules Aquila Cloud reg 19 04 +06.3           ~ 138 0
5 NAME Orphan Stream St* 19 09 -23.           ~ 281 0
6 NAME Galactic Bulge reg ~ ~           ~ 4794 0
7 NAME Local Group GrG ~ ~           ~ 9325 0
8 NAME Monoceros Stream St* ~ ~           ~ 374 1

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