2003ApJ...593..705T -
Astrophys. J., 593, 705-720 (2003/August-3)
Iron abundance in the intracluster medium at high redshift.
TOZZI P., ROSATI P., ETTORI S., BORGANI S., MAINIERI V. and NORMAN C.
Abstract (from CDS):
We present the analysis of the X-ray spectra of 18 distant clusters of galaxies with redshift 0.3<z<1.3. Most of them were observed with the Chandra satellite in long exposures ranging from 36 to 180 ks. For two of the z>1 clusters, we also use deep XMM-Newton observations. Overall, these clusters probe the temperature range 3keV≲kT≲8 keV. Our analysis is aimed at deriving the iron abundance in the intracluster medium (ICM) out to the highest redshifts probed to date. Using a combined spectral fit of cluster subsamples in different redshift bins, we investigate the evolution of the mean ICM metallicity with cosmic epoch. We find that the mean Fe abundance at z=0.8 is Z=0.25+0.04–0.06Z☉, consistent with the local canonical metallicity value, Z≃0.3Z☉, within the 1 σ confidence level (c.l.). Medium- and low-temperature clusters (kT<5 keV) tend to have larger iron abundances than hot clusters. At redshift z∼1.2 (four clusters at z>1), we obtain a statistically significant detection of the Fe K line in only one cluster (Z>0.10Z☉at the 90% c.l.). Combining all the current data sets from Chandra and XMM at z>1, the average metallicity is measured to be Z=0.21+0.10–0.05Z☉(1 σ error), thus suggesting no evolution of the mean iron abundance out to z≃1.2.
Abstract Copyright:
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Journal keyword(s):
Cosmology: Observations - Galaxies: Clusters: General - Galaxies: Intergalactic Medium - Nuclear Reactions, Nucleosynthesis, Abundances - X-Rays: Galaxies: Clusters
CDS comments:
table 1 : RX J1716.9+6708 = RX J1716.6+6708
Simbad objects:
17
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