منابع مشابه
Proper Motions in the Andromeda Subgroup
This article presents results of VLBI observations of regions of H2O maser activity in the Local Group galaxies M33 and IC 10. Since all position measurements were made relative to extragalactic background sources, the proper motions of the two galaxies could be measured. For M33, this provides this galaxy’s three dimensional velocity, showing that this galaxy is moving with a velocity of 190 ±...
متن کاملThe Mass of the Andromeda Galaxy
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...
متن کاملTracing Molecular Gas in the Andromeda Galaxy
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...
متن کاملOn the Nature of Andromeda Iv
Lying at a projected distance of 40 or 9 kpc from the centre of M31, Andromeda IV is an enigmatic object first discovered during van den Bergh’s search for dwarf spheroidal companions to M31. Being bluer, more compact and higher surface brightness than other known dwarf spheroidals, it has been suggested that And IV is either a relatively old ‘star cloud’ in the outer disk of M31 or a backgroun...
متن کاملThe Once and Future Andromeda Stream
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: BioScience
سال: 1974
ISSN: 0006-3568,1525-3244
DOI: 10.1093/bioscience/24.9.487