AGN feedback and iron enrichment in the powerful radio galaxy, 4C+55.16

作者:Hlavacek Larrondo J*; Fabian A C; Sanders J S; Taylor G B
来源:Monthly Notices of the Royal Astronomical Society, 2011, 415(4): 3520-3530.
DOI:10.1111/j.1365-2966.2011.18960.x

摘要

We present a detailed X-ray analysis of 4C+55.16, an unusual and interesting radio galaxy, located at the centre of a cool core cluster of galaxies. 4C+55.16 is X-ray bright (L-X(cluster) similar to 10(45) erg s(-1)), radio powerful, and shows clear signs of interaction with the surrounding intracluster medium (ICM). By combining deep Chandra (100 ks) with 1.4 GHz Very Large Array observations, we find evidence of multiple outbursts from the central active galactic nucleus (AGN), providing enough energy to offset cooling of the ICM (P-bubbles = 6.7 x 10(44) erg s(-1)). Furthermore, 4C+55.16 has an unusual intracluster iron distribution showing a plume-like feature rich in Fe L emission that runs along one of the X-ray cavities. The excess of iron associated with the plume is around 10(7)M(circle dot). The metal abundances are consistent with being solar-like, indicating that both Type Ia supernova and Type II supernova contribute to the enrichment. The plume and southern cavity form a region of cool metal-rich gas, and at the edge of this region, there is a clear discontinuity in temperature (from kT similar to 2.5 to similar to 5.0 keV), metallicity (from similar to 0.4 to similar to 0.8 Z(circle dot)), and surface brightness distribution, consistent with it being caused by a cold front. However, we also suggest that this discontinuity could be caused by cool metal-rich gas being uplifted from the central AGN along one of its X-ray cavities.

  • 出版日期2011-8