Chandra detection of the intracluster medium around 3C294 at z=1.786

Details Chandra detection of the intracluster medium around 3C294 at z=1.786 Chandra detection of the intracluster medium around 3C294 at z=1.786

2001-01-26

arxiv.org/abs/astro-ph/0101478v1

Mon.Not.Roy.Astron.Soc.322:L11,2001

Astronomy and Astrophysics

Astrophysics

5 pages, 6 figures, accepted by MNRAS

Scientific paper

10.1046/j.1365-8711.2001.04361.x

We present a Chandra observation of the powerful radio galaxy 3C294 showing clear evidence for a surrounding intracluster medium. At a redshift of 1.786 this is the most distant cluster of galaxies yet detected in X-rays. The radio core is detected as a point source, which has a spectrum consistent with a heavily-absorbed power law implying an intrinsic 2-10 keV luminosity of ~10^45 erg/s. A small excess of emission is associated with the southern radio hotspots. The soft, diffuse emission from the intracluster medium is centred on the radio source. It has an hour-glass shape in the N-S direction, extending to radii of at least 100 kpc, well beyond the radio source. The X-ray spectrum of this extended component is fit by a thermal model with temperature ~5 keV, or by gas cooling from above 7 keV at rates of ~400-700 Msolar/yr. The rest-frame 0.3-10 keV luminosity of the cluster is ~4.5x10^44 erg/s. The existence of such a cluster is consistent with a low density universe.

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