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Chandra Observation of a Group of Galaxies HCG 80: Does the Spiral-Only Group Have Hot Intragroup Gas?
Naomi Ota, Umeyo Morita, Tetsu Kitayama +1
We present an analysis of Chandra X-ray observations of a compact group of galaxies, HCG 80 (z=0.03). The system is a spiral-only group composed of four late-type galaxies, and has…
The Structure and Evolution of Early Cosmological HII Regions
T. Kitayama, N. Yoshida, H. Susa +1
We study the formation and evolution of HII regions around the first stars formed at z=10-30. We use a one-dimensional Lagrangian hydrodynamics code which self-consistently incorpo…
Quasi-hydrostatic intracluster gas under radiative cooling
Kuniaki Masai, Tetsu Kitayama
Quasi-hydrostatic cooling of the intracluster gas is studied. In the quasi-hydrostatic model, work done by gravity on the inflow gas with dP \neq 0, where P is the gas pressure, is…
X-ray Measurement of Dark Matter "Temperature" in Abell 1795
Yasushi Ikebe, Hans Boehringer, Tetsu Kitayama
We present a method from an X-ray observation of a galaxy cluster to measure the radial profile of the dark matter velocity dispersion, sigma_DM, and to compare the dark matter ``t…