The Hercules-aquila Cloud
نویسندگان
چکیده
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. Subject headings: galaxies: kinematics and dynamics — galaxies: structure — Local Group — Milky Way:halo
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