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Journal of Physical Studies 16(1/2), Article 1904 [7 pages] (2012)
DOI: https://doi.org/10.30970/jps.16.1904 PHYSICAL PROPERTIES OF GALAXY CLUSTER ABELL 13Iu. Babyk1,2
1Department of Physics, Kyiv National Taras Shevchenko University, 4, Glushkova Ave., UA--03127, Kyiv |
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This paper presents a study of X-ray Abell 13 ($kT = 5.76\pm 0.15$ keV) cluster located at the distance of 400 Mpc ($z=0.0943$) from us. The data on cluster was obtained from Chandra X-ray Observatory. We used numerical simulations and the hydrostatic equilibrium condition on the intracluster gas for determining the total mass of the cluster. We used the Navarro-Frenk-White model and spherically symmetry assumption for modeling the density profile of a dark matter, and also the $β$-model to study a central region of the cluster in detail. As a result, the following parameters of the $β$-model were obtained after getting fit to the surface brightness: $β = 0.87 \pm 0.07 $ and $r_{0} = 134 \pm 22 $ kpc. We used the DSDEPROJ method of deprojection for getting more accurate parameters to determine the density profile and mass of Abell 13. Thus, the total mass of the cluster was obtained as $M_{200} = 4.69_{-0.44}^{+0.51} 10^{14} M_{☉}$ for the radius $R_{200} = 1.51_{-0.33}^{+0.41}$ Mpc. The fraction of a dark matter in the total mass is $\sim 90\%$, while the gas is $\sim 10\%$. We did not take into account the galactic component, so, the ‟total” mass is the sum of masses of a dark matter and intercluster gas.
PACS number(s): 98.65.Cw, 98.65.Hb