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Date and Time of the Query: 2019-04-25 T06:54:39 PDT
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For refcode 2004PASJ...56..965F:
Retrieve 294 NED objects in this reference.
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Copyright by Astronomical Society of Japan. 2004PASJ...56..965F ASCA Compilation of X-Ray Properties of Hot Gas in Elliptical Galaxies and Galaxy Clusters: Two Breaks in the Temperature Dependences Fukazawa, Yasushi; Makishima, Kazuo; Ohashi, Takaya Abstract. Utilizing ASCA archival data of about 300 objects of elliptical galaxies, groups, and clusters of galaxies, we performed systematic measurements of the X-ray properties of hot gas in their systems, and compiled them in this paper. The steepness of the luminosity-temperature (LT) relation, Li_X_ is proportional to (kT)^{alpha}^, in the range of kT ~ 1.5 - 15 keV is {alpha} = 3.17 0.15, consistent with previous measurements. In the relation, we find two breaks at around ICM temperatures of 1 keV and 4 keV: {alpha} = 2.34 +/- 0.29 above 4 keV, 3.74 +/- 0.32 in 1.5-5 keV, and 4.03 +/- 1.07 below 1.5keV. Such two breaks are also evident in the temperature and size relation. The steepness in the LT relation at kT > 4 keV is consistent with the scale-relation derived from the CDM model, indicating that the gravitational effect is dominant in richer clusters, while poorer clusters suffer non-gravity effects. The steep LT relation below 1keV is almost attributed to X-ray faint systems of elliptical galaxies and galaxy groups. We found that the ICM mass within the scaling radius R_1500_ follows the relation of M_gas_ is proportional to T^2.33 +/- 0.07^ from X-ray faint galaxies to rich clusters. Therefore, we speculate that even such X-ray faint systems contain a large-scale hot gas, which is too faint to detect. Key words: galaxies: clusters: general, galaxies: elliptical and lenticular, cD, X-rays: galaxies: clusters, X-rays: ISM
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