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J/ApJ/690/295        Chandra observations of Cl1604            (Kocevski+, 2009)
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Beginning of ReadMe : J/ApJ/690/295 Chandra observations of J1604+4314 supercluster (Kocevski+, 2009) ================================================================================ Chandra observations of the CL1604 supercluster at z=0.9: evidence for an overdensity of active galactic nuclei. Kocevski D.D., Lubin L.M., Gal R., Lemaux B.C., Fassnacht C.D., Squires G.K. <Astrophys. J., 690, 295-318 (2009)> =2009ApJ...690..295K ================================================================================ ADC_Keywords: Clusters, galaxy ; X-ray sources ; Redshifts ; Cross identifications Keywords: galaxies: clusters: general - large-scale structure of universe - X-rays: galaxies: clusters Abstract: We present the results of Chandra observations of the Cl1604 supercluster at z 0.9. The system is the largest structure mapped at redshifts approaching unity, containing at least eight spectroscopically confirmed galaxy clusters and groups. Using two 50ks ACIS-I pointings we examine both the X-ray point-source population and the diffuse emission from individual clusters in the system. Over an area encompassing the entire supercluster ( 0.154deg^2^), we find a 2.5sigma excess of point sources detected in the hard band (2-10keV) relative to the number of sources found in blank fields observed by Chandra. No such excess is observed in the soft band (0.5-2keV). The hard-band source density is 1.47 times greater than that of a blank field, in agreement with the previously reported correlation between overdensity amplitude and cluster redshift. Using a maximum likelihood technique, we have matched 112 of the 161 detected X-ray point sources to optical counterparts and found 15 sources that are associated with the supercluster. All 15 sources have rest-frame luminosities consistent with emission from active galactic nuclei (AGNs). Description: Observations of the Cl1604 supercluster were carried out with Chandra's Advanced CCD Imaging Spectrometer (ACIS) on 2006 June 23 (obsID 7343), June 25 (obsID 6933), and October 1 (obsID 6932). Our optical data of the system consist of two pointings of the Large Format Camera (LFC) on the Palomar 5m telescope and 17 pointings of the higher-resolution Advanced Camera for Surveys (ACS) on the Hubble Space Telescope (HST). Details of these observations and subsequent data reduction are presented in Gal et al. (2005AJ....129.1827G, 2008ApJ...684..933G) and D. D. Kocevski et al. (2009ApJ...700..901K). The Cl1604 supercluster has been extensively mapped in litterature using the Low-Resolution Imaging Spectrograph (LRIS) and the Deep Imaging Multi-Object Spectrograph (DEIMOS) on the Keck 10m telescope.