Was the Andromeda Stream Produced by a Disk Galaxy?
نویسندگان
چکیده
منابع مشابه
On the Accretion Origin of a Vast Extended Stellar Disk around the Andromeda Galaxy
We present the discovery of an inhomogenous, low-surface brightness, extended disk-like structure around the Andromeda galaxy (M31) based on a large kinematic survey of more than 2800 stars with the Keck/DEIMOS multi-object spectrograph. The stellar structure spans radii from 15 kpc out to ∼ 40 kpc, with detections out to R ∼ 70 kpc. The constituent stars lag the expected velocity of circular o...
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A complete 175 μm map of the Andromeda galaxy (M31) at 1.′3 resolution shows the distribution of cold dust. It is dominated by a ring at 10 kpc radius supplemented by a faint outer one at 14 kpc. No clear spiral pattern is recognisable. The azimuthally averaged radial brightness profile is rather flat within the 10 kpc ring and decreases exponentially outside thereof, discernible down to a brig...
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This paper argues that the Milky Way galaxy is probably the largest member of the Local Group. The evidence comes from estimates of the total mass of the Andromeda galaxy (M31) derived from the three dimensional positions and radial velocities of its satellite galaxies, as well as the projected positions and radial velocities of its distant globular clusters and planetary nebulae. The available...
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We present results from an Andromeda Galaxy (M31) survey of star-forming regions based on 24 μm luminosity for H2O masers, NH3(1,1) and NH3(2,2) lines, and Hydrogen recombination lines (H66α). Although five H2O masers were detected in the initial survey of 206 regions towards M31, we do not detect additional masers in a follow up survey of 300 similar luminous 24 μm regions. We do not detect NH...
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The interaction between an accreting satellite and the Andromeda galaxy has been studied using an N -body simulation to investigate the self-gravitating response of the disk, the bulge, and the dark matter halo to an accreting satellite. Our simulation shows that the “giant stream” is the tidal debris of the infalling satellite. The debris also produces diffuse shells on the east and the west s...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2008
ISSN: 0004-637X,1538-4357
DOI: 10.1086/590386