Chandra Spectral Analysis of the Intergalactic Gas in the Unusual Cluster RXJ 0419+0225

Astronomy and Astrophysics – Astronomy

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Scientific paper

We performed a spatially resolved, spectroscopic analysis of the
intracluster medium of the bright, nearby (z 0.012) galaxy cluster
RXJ 0419+0225, along with two deep Chandra observations taken with the ACIS-S3 chip. The cluster is unusual since it is very cold yet still appears to be a dynamic system, as was previously observed in an ASCA study. We conducted a detailed analysis of temperature, velocity, and elemental abundance distributions in order to better understand the evolutionary stage of this system. RXJ 0419+0225 has a cold core with temperature variations from 1.1+-0.04 keV in the center to 1.6+-0.04 keV in the outer regions. We find significant (>90% confidence level) radial abundance gradients of Si, S, Fe, Mg and Ne. Also, the radial distributions of temperatures and
abundances is asymmetric, thus indicating the presence of substructuring. We explore the nature of the temperature and metal abundance substructure by building adaptively binned maps of the interesting parameters.

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