Evolution of the Coronae in Early-Type Galaxies
نویسندگان
چکیده
منابع مشابه
Evolution of early-type galaxies in clusters
The slow evolution of the M/L ratios, colors, and line strengths of cluster early-type galaxies to z ∼ 1 suggests that their stars were formed at very high redshift. At the same time, morphological studies of distant clusters indicate significant evolution in the early-type galaxy population. Striking evidence for strong morphological evolution in clusters is the discovery of a large number of ...
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We study the Fundamental Plane (FP) of field early-type galaxies at intermediate redshift, using HST WFPC2 observations and deep Keck spectroscopy. Structural parameters and internal velocity dispersions are measured for eighteen galaxies at 0.15 < z < 0.55. Rest frame M⁄ LB ratios are determined from the Fundamental Plane and compared to those of cluster early-type galaxies at the same redshif...
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We study the photometric and spectral properties of 39320 early-type galaxies within the Sloan Digital Sky Survey (SDSS), as a function of both local environment and redshift. The distance to the nearest cluster of galaxies (scaled by the virial radius of the cluster) and the distance to the 10 nearest luminous neighbor (Mr < −21.5) were used to define two extremes in environment. The propertie...
متن کاملMassive Coronae of Galaxies
There is reason to suspect that about half of the baryons are in pressure-supported plasma in the halos of normal galaxies, drawn in by gravity along with about half of the dark matter. To be consistent with the observations this baryonic component, the corona, would have to be hotter than the kinetic temperature of the dark matter in the halo so as to produce acceptable central electron densit...
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We present results from an optical–infrared photometric study of early–type (E+S0) galaxies in 19 galaxy clusters out to z = 0.9. The galaxy sample is selected on the basis of morphologies determined from HST WFPC2 images, and is photometrically defined in the K–band in order to minimize redshift–dependent selection biases. Using new ground–based photometry in five optical and infrared bands fo...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1990
ISSN: 0252-9211
DOI: 10.1017/s0252921100012392