Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-02-25
Astrophys.J. 589 (2003) L1-L4
Astronomy and Astrophysics
Astrophysics
Submitted to ApJ Letters
Scientific paper
10.1086/375727
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.
Mathur Smita
Williams Rik J.
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