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Date and Time of the Query: 2019-08-18 T01:47:12 PDT
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For refcode 2009A&A...501..157N:
Retrieve 22 NED objects in this reference.
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2009A&A...501..157N Gravitational potential and X-ray luminosities of early-type galaxies observed with XMM-Newton and Chandra Nagino, R.; Matsushita, K. Abstract. Aims. We study the dark matter content in early-type galaxies and investigate whether X-ray luminosities of early-type galaxies are determined by the surrounding gravitational potential. Methods: We derived gravitational mass profiles of 22 early-type galaxies observed with XMM-Newton and Chandra. Results: Sixteen galaxies show constant or decreasing radial temperature profiles, and their X-ray luminosities are consistent with kinematical energy input from stellar mass loss. The temperature profiles of the other 6 galaxies increase with radius, and their X-ray luminosities are significantly higher. The integrated mass-to-light ratio of each galaxy is constant at that of stars within 0.5-1~r_e, and increases with radius, where r_e_ is the effective radius of a galaxy. The scatter of the central mass-to-light ratio of galaxies was less in K-band light. At 3~r_e, the integrated mass-to-light ratios of galaxies with flat or decreasing temperature profiles are twice the value at 0.5~r_e, where the stellar mass dominates, and at 6~r_e, these increase to three times the value at 0.5~r_e. Conclusions: This feature should reflect common dark and stellar mass distributions in early-type galaxies: within 3~r_e, the mass of dark matter is similar to the stellar mass, while within 6~r_e, the former is larger than the latter by a factor of two. In contrast, X-ray luminous galaxies have higher gravitational mass in the outer regions than X-ray faint galaxies. We describe these X-ray luminous galaxies as the central objects of large potential structures; the presence or absence of this potential is the main source of the large scatter in the X-ray luminosity. Key words: galaxies: elliptical and lenticular, cD, galaxies:, ISM, X-rays: galaxies, X-rays: ISM
Retrieve 22 NED objects in this reference.
Please click here for ADS abstract

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