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Date and Time of the Query: 2019-06-19 T09:59:39 PDT
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For refcode 2006ApJ...636..698F:
Retrieve 53 NED objects in this reference.
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2006ApJ...636..698F Scaling Mass Profiles around Elliptical Galaxies Observed with Chandra and XMM-Newton Y. Fukazawa, J. G. Botoya-Nonesa, J. Pu, A. Ohto, and N. Kawano Abstract. We investigated the dynamical structure of 53 elliptical galaxies using the Chandra archival X-ray data. In X-ray -- luminous galaxies, temperature increases with radius and gas density is systematically higher at the optical outskirts, indicating the presence of a significant amount of the group-scale hot gas. In contrast, X-ray -- dim galaxies show a flat or declining temperature profile against radius and the gas density is relatively lower at the optical outskirts. Thus, it is found that X-ray -- bright and faint elliptical galaxies are clearly distinguished by the temperature and gas density profile. The mass profile is well scaled by a virial radius r_200_ rather than an optical half-radius r_e_, is quite similar at (0.001 -- 0.03)r_200_ between X-ray -- luminous and dim galaxies, and smoothly connects to those profiles of clusters of galaxies. At the inner region of (0.001 -- 0.01)r_200_ or (0.1 -- 1)r_e_, the mass profile well traces a stellar mass with a constant mass-to-light ratio of M/L_B_=3 -- 10M_sun_/L_sun_. The M/L_B_ ratio of X-ray -- bright galaxies rises up steeply beyond 0.01r_200_ and thus requires a presence of massive dark matter halo. From the deprojection analysis combined with the XMM-Newton data, we found that X-ray -- dim galaxies NGC 3923, NGC 720, and IC 1459 also have a high M/L_B_ ratio of 20 -- 30 at 20 kpc, comparable to that of X-ray -- luminous galaxies. Therefore, dark matter is indicated to be common in elliptical galaxies; their dark matter distribution, as well as that of galaxy clusters, almost follows the NFW profile. Key words: Galaxies: Elliptical and Lenticular, cD, Galaxies: ISM, X-Rays: Galaxies
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