Astrophys. J., 867, 35-35 (2018/November-1)
Stormy weather in 3C 196.1: nuclear outbursts and merger events shape the environment of the hybrid radio galaxy 3C 196.1.
RICCI F., LOVISARI L., KRAFT R.P., MASSARO F., PAGGI A., LIUZZO E., TREMBLAY G., FORMAN W.R., BAUM S., O'DEA C. and WILKES B.
Abstract (from CDS):
We present a multiwavelength analysis based on archival radio, optical, and X-ray data of the complex radio source 3C 196.1, whose host is the brightest cluster galaxy of a z = 0.198 cluster. HST data show Hα+[N II] emission aligned with the jet 8.4 GHz radio emission. An Hα+[N II] filament coincides with the brightest X-ray emission, the northern hotspot. Analysis of the X-ray and radio images reveals cavities located at galactic and cluster scales. The galactic-scale cavity is almost devoid of 8.4 GHz radio emission and the southwestern Hα+[N II] emission is bounded (in projection) by this cavity. The outer cavity is cospatial with the peak of 147 MHz radio emission, and hence we interpret this depression in X-ray surface brightness as being caused by a buoyantly rising bubble originating from an active galactic nuclei outburst ∼280 Myr ago. A Chandra snapshot observation allowed us to constrain the physical parameters of the cluster, which has a cool core with a low central temperature ∼2.8 keV, low central entropy index ∼13 keV cm2 and a short cooling time of ∼500 Myr, which is < 0.05 of the age of the universe at this redshift. By fitting jumps in the X-ray density, we found Mach numbers between 1.4 and 1.6, consistent with a shock origin. We also found compelling evidence of a past merger, indicated by a morphology reminiscent of gas sloshing in the X-ray residual image. Finally, we computed the pressures, enthalpies Ecav and jet powers Pjet associated with the cavities: Ecav ∼ 7 x 1058 erg, Pjet ∼ 1.9 x 1044 erg s–1 for the inner cavity and Ecav ∼ 3 x 1060 erg, Pjet ∼ 3.4 x 1044 erg s–1 for the outer cavity.
© 2018. The American Astronomical Society. All rights reserved.
galaxies: active - galaxies: clusters: general - galaxies: clusters: intracluster medium - radio continuum: galaxies - radio continuum: ISM - X-rays: galaxies: clusters
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