Chandra discovery of the intracluster medium around UM425 at redshift 1.47

Abstract

We report on a discovery of a candidate cluster of galaxies at redshift z=1.47 based on Chandra observations in the field of quasars UM425 A & B. We detect with high significance diffuse emission due the intracluster hot gas around the quasar pair. This is the second highest redshift cluster candidate after 3C294 at z=1.786. The diffuse emission is elliptical in shape with about 17" extent. If indeed at z=1.47, this corresponds to a physical size of 140 h_{70}^{-1} Kpc and 2--10 keV luminosity of about 3 times 10^{43} erg/s. The cluster is unlikely to be the long sought gravitational lens invoked to explain unusual brightness of UM425 A and the close quasar pair. Coexistence of the quasars with the cluster suggests a link of activity to cluster environment. The unusual brightness of UM425 A may then be due to a higher accretion rate. We also comment briefly on the X-ray spectra of UM 425 A & B which also happen to be broad absorption line quasars. We argue that present evidence suggests that the quasars are just a pair and not lensed images of the same quasar.

arXiv commentSubmitted to ApJ Letters

References in corpus (20)

• The Cosmic Triangle: Revealing the State of the Universe
• The obscured growth of massive black holes
• Chandra X-ray Observations of the Hydra A Cluster: An Interaction Between the Radio Source and the X-Ray-Emitting Gas
• Chandra imaging of the complex X-ray core of the Perseus cluster
• The Las Campanas Redshift Survey
• A Catalog of 200 Galaxy Clusters Serendipitously Detected in the ROSAT PSPC Pointed Observations
• Quasi-Stellar Objects, Ultraluminous IR Galaxies, and Mergers
• Narrow Line Seyfert 1 Galaxies and the Evolution of Galaxies & Active Galaxies
• Properties of Radio-Selected Broad Absorption-Line Quasars from the FIRST Survey
• The Properties of Poor Groups of Galaxies: II. X-ray and Optical Comparisons
• X-ray Spectroscopy of QSOs with Broad Ultraviolet Absorption Lines
• A Chandra Survey of Broad Absorption Line Quasars
• A Very Hot, High Redshift Cluster of Galaxies: More Trouble for Omega_0 = 1
• Evolution of the cluster X-ray scaling relations since z>0.4
• The ROSAT-ESO Flux Limited X-ray (REFLEX) Galaxy Cluster Survey II: The Spatial Correlation Function
• An Unexpectedly High AGN Fraction in Red Cluster Galaxies
• Broad Absorption Line Quasars in the Early Data Release from the Sloan Digital Sky Survey
• Chandra detection of the intracluster medium around 3C294 at z=1.786
• XMM-Newton Observations of Two BAL QSOs: Q1246-057 and SBS1542+541
• Thomson Thick X-ray Absorption in a Broad Absorption Line Quasar PG0946+301

Cited by in corpus (4)

• Structure and substructure analysis of DAFT/FADA galaxy clusters in the [0.4-0.9] redshift range
• Lens or Binary? Chandra Observations of the Wide Separation Broad Absorption Line Quasar Pair UM425
• Discovery of the disturbed radio morphology in the interacting binary quasar FIRST J164311.3+315618
• Discovery of a Galaxy Cluster in the Foreground of the Wide-Separation Quasar Pair UM425