Results 1 to 10 of about 561,353 (372)
In Search of the Largest Velocity Dispersion Galaxies [PDF]
The Astrophysical Journal, 2008 We present Hobby-Eberly Telescope (HET) observations for galaxies at redshift z < 0.3 from the Sloan Digital Sky Survey (SDSS) showing large velocity dispersions while appearing to be single galaxies in HST images. The high signal-to-noise HET spectra provide more definitive velocity dispersions.
Salviander, Sarah +4 more
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A THEOREM ON CENTRAL VELOCITY DISPERSIONS [PDF]
The Astrophysical Journal, 2009 submitted to ...
An, Jin Hyeok, Evans, N. W.
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The Velocity Dispersion in the Cold Collapse [PDF]
Symposium - International Astronomical Union, 1996 We investigate the growth of the velocity dispersion in the initial stage of the cold dissipationless collapse of spherical collisionless systems by a perturbation theory. We show that the tangential velocity dispersion grows faster than the radial one for the system with centrally condensed initial density profile.
M. Sasaki +3 more
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Velocity Dispersions in Clusters of Galaxies [PDF]
Highlights of Astronomy, 1977 31 redshifts have been obtained for A1367, 34 for A262 and 61 for the Centaurus cluster (HMS 1247-4102). Full details of this work have been and will be presented in M.N.R.A.S. Both A1367 and A262 are spiral-rich in Oemler’s classification, while Centaurus is intermediate in type between spiral-rich and poor.
J. A. Dawe +3 more
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Velocity dispersion around ellipticals in MOND [PDF]
Astronomy & Astrophysics, 2007 We investigate how different models that have been proposed for solving the dark matter problem can fit the velocity dispersion observed around elliptical galaxies, on either a small scale (~ 20kpc) with stellar tracers, such as planetary nebulae, or large scale (~ 200kpc) with satellite galaxies as tracers.
Tiret, Olivier +4 more
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Imprints of zero-age velocity dispersions and dynamical heating on the age–velocity dispersion relation [PDF]
Publications of the Astronomical Society of Japan, 2017 Abstract Observations of stars in the the solar vicinity show a clear tendency of old stars to have larger velocity dispersions. This relation is called the age–velocity dispersion relation (AVR) and it is believed to provide insight into the heating history of the Milky Way galaxy. Here, in order to investigate the origin of the AVR, we
Takayuki R. Saitoh +4 more
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Velocity dispersions in galaxy clusters
The Astrophysical Journal, 1993 We analyze the velocity dispersions of 79 galaxy clusters having at least 30 galaxies with available redshifts. We show that different estimates of velocity dispersion give similar results on cluster samples of at least 20 galaxies each. However, only robust estimates of velocity dispersion seem to be efficient on cluster samples with 10 galaxies each.
GIRARDI, MARISA +4 more
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Stellar velocity dispersion in NLS1 galaxies [PDF]
Proceedings of the International Astronomical Union, 2004 5 pages, 4 figures, accepted for publication in ...
BOTTE, VIRGINIA +4 more
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Macro-flow and Velocity Dispersion [PDF]
8th International Congress of the Brazilian Geophysical Society, 2003 Deformation resulting from a compressional wave can cause pore fluid motion on the order of the wavelength. If the fluid mobility is high, pressure can be equilibrated between regions of gas versus brine saturation. This can result in a relaxed, drained velocity even lower than dry or gas saturated velocities. This diffusion of fluid pressure can cause
M. Batzle, R. Hofmann
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Determining the velocity dispersion of the thick disc [PDF]
Monthly Notices of the Royal Astronomical Society, 2012 We attempt to recover the mean vertical velocity and vertical velocity dispersion as a function of the Galactic height for a sample drawn from a realistic Galaxy distribution function by following the method presented in Moni Bidin et al. (2012). We find that, for the sample size used, the observational error in the velocities is much smaller than the ...
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