Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21011208k&link_type=abstract
American Astronomical Society Meeting 210, #112.08; Bulletin of the American Astronomical Society, Vol. 39, p.237
Astronomy and Astrophysics
Astronomy
Scientific paper
We present preliminary results from a Chandra} observation of the cluster gas associated with the powerful FR II radio galaxy 3C 438. This radio galaxy (at z=0.29) is embedded within a massive cluster with gas temperature 17 keV and bolometric luminosity of 6 ×1045 ergs s-1. It is unclear if this high temperature represents the gravitational mass of the cluster, or if this is an already high ( 11 keV) temperature cluster that has been transiently heated. We detect a surface brightness discontinuity in the gas that extends 600 kpc through the cluster. The radio galaxy 3C 438 is too small ( 110 kpc across) and too weak to have created this large disturbance in the gas. The discontinuity must be the result of either an extremely powerful nuclear outburst or the major merger of two massive clusters. If the observed features are the result of a nuclear outburst, it must be from an earlier epoch of unusually energetic nuclear activity. However, the energy required ( 1063 ergs) to move the gas on the observed spatial scales strongly supports the merger hypothesis. In either scenario, this is one of the most extreme events in the local Universe.
Forman William R.
Hardcastle Martin J.
Jones Christine
Kraft Ralph Porter
Nulsen P. E.
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