Volume 398, Number 1, January IV 2003
|Page(s)||31 - 39|
|Section||Cosmology (including clusters of galaxies)|
|Published online||14 January 2003|
BeppoSAX observation of the cluster Abell 970
Instituto de Astronomia, Geofísica e Ciências Atmos. (IAG), Universidade de São Paulo, Brazil
2 Divisão de Astrofísica INPE/MCT, 12227-010, São José dos Campos/S.P., Brazil
3 Observatoire de Paris-Meudon, GEPI, 92195 Meudon, France
Corresponding author: G. B. Lima Neto, firstname.lastname@example.org
Accepted: 6 November 2002
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 , a metallicity of , and an interstellar hydrogen absorption column density of 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 α-elements/iron ratio that we derive for this cluster supports the hypothesis of early intracluster medium enrichment by Type II supernovae.
Key words: galaxies: clusters: individual: Abell 970 / X-rays: galaxies: clusters
© ESO, 2003
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