The X-ray luminous cluster underlying the z = 1.04 quasar PKS1229-021

Abstract

We present a 100 ks Chandra observation studying the extended X-ray emission around the powerful z=1.04 quasar PKS1229-021. The diffuse cluster X-ray emission can be traced out to ~15 arcsec (~120 kpc) radius and there is a drop in the calculated hardness ratio inside the central 5 arcsec consistent with the presence of a cool core. Radio observations of the quasar show a strong core and a bright, one-sided jet leading to the SW hot spot and a second hot spot visible on the counter-jet side. Although the wings of the quasar PSF provided a significant contribution to the total X-ray flux at all radii where the extended cluster emission was detected, we were able to accurately subtract off the PSF emission using ChaRT and marx simulations. The resulting steep cluster surface brightness profile for PKS1229-021 appears similar to the profile for the FRII radio galaxy 3C444, which has a similarly rapid surface brightness drop caused by a powerful shock surrounding the radio lobes (Croston et al.). Using a model surface brightness profile based on 3C444, we estimated the total cluster luminosity for PKS1229-021 to be L_X ~ 2 x 10^{44} erg/s. We discuss the difficulty of detecting cool core clusters, which host bright X-ray sources, in high redshift surveys.

10 pages, 9 figures, accepted by MNRAS

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• High-Redshift Cool-Core Galaxy Clusters Detected via the Sunyaev--Zel'dovich Effect in the South Pole Telescope Survey
• Mystery solved: discovery of extended radio emission in the merging galaxy cluster Abell 2146
• The Chandra Deep Group Survey -- cool core evolution in groups and clusters of galaxies
• MARXS: A modular software to ray-trace X-ray instrumention
• Suzaku observations of the type 2 QSO in the central galaxy of the Phoenix cluster
• Offsets between X-ray and Radio Components in X-ray Jets: The AtlasX
• Clusters of Galaxies Masquerading as X-Ray Quasars
• Clustering, Cosmology and a New Era of Black Hole Demographics -- I. The Conditional Luminosity Function of Active Galactic Nuclei
• The Unusual Weak-Line Quasar PG1407+265 and its Foreground z~0.7 X-ray Cluster