Query : 2004A&A...420...61S

2004A&A...420...61S - Astronomy and Astrophysics, volume 420, 61-74 (2004/6-2)

Detection of X-ray clusters of galaxies by matching RASS photons and SDSS galaxies within GAVO.


Abstract (from CDS):

A new method for a simultaneous search for clusters of galaxies in X-ray photon maps and optical galaxy maps is described. The merging of X-ray and optical data improves the source identification so that a large amount of telescope time for spectroscopic follow-up can be saved. The method appears thus ideally suited for the analysis of the recently proposed wide-angle X-ray missions like DUO and ROSITA. As a first application, clusters are extracted from the 3rd version of the ROSAT All-Sky Survey and the Early Date Release of the Sloan Digital Sky Survey (SDSS). The time-consuming computations are performed within the German Astrophysical Virtual Observatory (GAVO). On a test area of 140 square degrees, 75 X-ray clusters are detected down to an X-ray flux limit of 3-5x10–13erg/s/cm2 in the ROSAT energy band 0.1-2.4keV. The clusters have redshifts z≤ 0.5. The survey thus fills the gap between traditional large-area X-ray surveys and serendipitous X-ray cluster searches based on pointed observations, and has the potential to yield about 4000 X-ray clusters after completion of SDSS.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - methods: statistical

VizieR on-line data: <Available at CDS (J/A+A/420/61): table2.dat table3.dat>

Nomenclature: Table 2: [SBV2004] RS NN (Nos 1-75).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 0

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