Chandra measurements of the distribution of mass in the luminous lensing cluster Abell 2390

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dc.creatorAllen, S. W.
dc.creatorEttori, S.
dc.creatorFabian, A. C.
dc.date2000-08-31
dc.date2001-01-10
dc.date.accessioned2026-07-07T10:47:16Z
dc.date.available2026-07-07T10:47:16Z
dc.descriptionWe present spatially-resolved X-ray spectroscopy of the luminous lensing cluster Abell 2390, using observations made with the Chandra observatory. The temperature of the X-ray gas is shown to rise with increasing radius within the central ~200 kpc of the cluster, and then remain approximately isothermal, with kT =11.5^{+1.5}_{-1.6} keV, out to the limits of the observations at r~1.0 Mpc. The total mass profile determined from the Chandra data has a form in good agreement with the predictions from numerical simulations. Using the parameterization of Navarro, Frenk & White (1997), we measure a scale radius r_s~0.9 Mpc and a concentration parameter c~4. The best-fit X-ray mass model is in good agreement with independent gravitational lensing results and optical measurements of the galaxy velocity dispersion in the cluster. The X-ray gas-to-total-mass ratio rises with increasing radius with f_gas = 21 \pm 10 per cent at r=0.9 Mpc. The azimuthally-averaged 0.3-7.0 keV surface brightness profile exhibits a small core radius and a clear `break' at r~500 kpc, where the slope changes from S_X \approxpropto r^{-1.5} to S_X \approxpropto r^{-3.6}. The data for the central region of the cluster indicate the presence of a cooling flow with a mass deposition rate of 200-300 solar masses per year and an age of 2-3 Gyr.
dc.description24 pages, 12 figs, 3 tables. Accepted for publication in MNRAS. Some improvements over original submitted version including enhanced X-ray mass analysis
dc.identifierhttps://arxiv.org/abs/astro-ph/0008517
dc.identifierhttp://arxiv.org/abs/astro-ph/0008517
dc.identifierMon.Not.Roy.Astron.Soc.324:877,2001
dc.identifierdoi:10.1046/j.1365-8711.2001.04318.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/183478
dc.subjectAstrophysics
dc.titleChandra measurements of the distribution of mass in the luminous lensing cluster Abell 2390
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