4.7 Article

Chandra observations of Abell 2029:: No cooling flow and a steep abundance gradient

期刊

ASTROPHYSICAL JOURNAL
卷 573, 期 1, 页码 L13-L17

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UNIV CHICAGO PRESS
DOI: 10.1086/341990

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cooling flows; galaxies : abundances; galaxies : clusters : individual (A2029); intergalactic medium; X-rays : galaxies

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We have obtained high spatial resolution temperature and abundance profiles for the galaxy cluster Abell 2029 with the Chandra ACIS-S instrument. Our observations reveal that the spectra are well fitted by a single-phase gas in each annulus. While the temperature of the intracluster medium drops from similar to9 keV at 3' (260 k(70)(-1) pc) to 3 keV in the central 5 (5 k(70)(-1) kpc) of the cluster, there is no evidence of gas emitting at temperatures below 3 keV. The addition of a cooling flow component does not improve the fits, despite previous claims for a massive cooling flow. There is also no evidence of excess absorption above the Galactic N-H-value. We also observe a steep Fe abundance gradient, such that Z(Fe) greater than or similar to 2Z(circle dot) (assuming meteoritic solar Fe abundance) in the core, consistent with significant enrichment from Fe-rich Type Ia supernovae in the cD galaxy. The Fe abundance drops to approximate to0.5 Z(circle dot) at 3' (260 k(70)(-1) pc), in good agreement with previous BeppoSAX measurements. The high-resolution image reveals neither a strong central point source nor any filamentary structure related to a cooling flow or a merger. The absence of a strong merger signature argues against the creation of the wide-angle-tailed radio source morphology in a merger event.

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