The soft X-ray cluster-AGN spatial cross-correlation function in theROSAT-NEP survey
| Autor: | Peter Schuecker, Hans Boehringer, I. M. Gioia, E. Pierpaoli, Nico Cappelluti, C. R. Mullis, J. P. Henry |
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| Rok vydání: | 2007 |
| Předmět: |
Physics
Active galactic nucleus Astrophysics::High Energy Astrophysical Phenomena Astrophysics (astro-ph) FOS: Physical sciences Sigma Astronomy and Astrophysics Ecliptic pole Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Galaxy Redshift Space and Planetary Science ROSAT Cluster (physics) Cluster analysis Astrophysics::Galaxy Astrophysics |
| Zdroj: | Astronomy & Astrophysics. 465:35-40 |
| ISSN: | 1432-0746 0004-6361 |
| DOI: | 10.1051/0004-6361:20065920 |
| Popis: | X-ray surveys facilitate investigations of the environment of AGNs. Deep Chandra observations revealed that the AGNs source surface density rises near clusters of galaxies. The natural extension of these works is the measurement of spatial clustering of AGNs around clusters and the investigation of relative biasing between active galactic nuclei and galaxies near clusters. The major aims of this work are to obtain a measurement of the correlation length of AGNs around clusters and a measure of the averaged clustering properties of a complete sample of AGNs in dense environments. We present the first measurement of the soft X-ray cluster-AGN cross-correlation function in redshift space using the data of the ROSAT-NEP survey. The survey covers 9x9 deg^2 around the North Ecliptic Pole where 442 X-ray sources were detected and almost completely spectroscopically identified. We detected a > 3 sigma significant clustering signal on scales s 7 pages, 6 figures, Accepted by A&A |
| Databáze: | OpenAIRE |
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