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BeppoSAX observation of the cluster Abell 970 | | G. B. Lima Neto
; H. V. Capelato
; L. Sodre Jr
; D. Proust
; | | Date: |
11 Nov 2002 | | Journal: | Astron.Astrophys. 398 (2003) 31-40 | | Subject: | astro-ph | | Affiliation: | IAG/USP, Brazil), H. V. Capelato (INPE, Brazil), L. Sodre Jr (IAG/USP, Brazil), D. Proust (GEPI/Obs. Paris-Meudon, France | | Abstract: | We report new results on the cluster of galaxies Abell 970 obtained from X-ray observation with BeppoSAX. Our analysis of the BeppoSAX MECS and LECS data in the range [0.15-10] keV reveals a mean cluster gas temperature of kT = 4.46_{-0.15}^{+0.14}, a metallicity of Z = 0.31_{-0.04}^{+0.05} Z_odot, and an interstellar hydrogen absorption density column of N_H = 6.05_{-0.97}^{+1.29} 10^20 cm^-2. Moreover, we obtained azimuthally averaged radial profiles of these quantities. Our results are consistent with the hypothesis that Abell 970 has been disturbed by a past merger or by the ongoing merger process of a substructure, that put the cluster out of equilibrium. This is also demonstrated by the offset between the gas and galaxy distributions. Combining the X-ray data with a recently published analysis of new galaxy radial velocities, we conclude that a subcluster 8 arcmin to the NW is falling into Abell 970 and will merge in a few Gigayears, thus disturbing Abell 970’s newly acquired equilibrium. The high alpha-elements/iron ratio that we derive for this cluster supports the hypothesis of early intracluster medium enrichment by Type II supernovae. | | Source: | arXiv, astro-ph/0211230 | | Services: | Forum | Review | PDF | Favorites | |
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