XMM-Newton view of X-ray overdensities from nearby galaxy clusters: the environmental dependencies

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XMM-Newton view of X-ray overdensities from nearby galaxy clusters: the environmental dependencies

Type: Article / Letter to editor
Title: XMM-Newton view of X-ray overdensities from nearby galaxy clusters: the environmental dependencies
Author: CaglarT.;HudaverdiM.
Journal Title: Monthly Notices of the Royal Astronomical Society
Issue: 4
Volume: 471
Start Page: 4990
End Page: 5007
Pages: 18
Issue Date: 2017
Keywords: galaxies: active – galaxies: clusters: general – X-rays: galaxies – X- rays: galaxies: clusters – galaxies: clusters: intracluster medium – galaxies: clusters: individual
Abstract: In this work, we studied ten nearby (z≤0.038) galaxy clusters to understand possible interactions between hot plasma and member galaxies. A multi-band source detection was applied to detect point-like structures within the intra-cluster medium. We examined spectral properties of a total of 391 X-ray point sources within cluster’s potential well. Log N - Log S was studied in the energy range of 2-10 keV to measure X-ray overdensities. Optical overdensities were also calculated to solve suppression/triggering phenomena for nearby galaxy clusters. Both X-ray to optical flux/luminosity properties, (X/O, LX/LB, LX/LK), were investigated for optically identified member galaxies. X-ray luminosity values of our point sources are found to be faint (40.08 ≤ log(LX) ≤ 42.39 erg s−1). The luminosity range of point sources re- veals possible contributions to X-ray emission from LLAGNs, X-ray Binaries and star formation. We estimated ∼ 2 times higher X-ray overdensities from galaxies within galaxy clusters compared to fields. Our results demonstrate that optical overdensities are much higher than X-ray overdensities at the cluster’s centre, whereas X-ray over- densities increase through the outskirts of clusters. We conclude that high pressure from the cluster’s centre affects the balance of galaxies and they lose a significant amount of their fuels; as a result, clustering process quenches X-ray emission of the member galaxies. We also find evidence that the existence of X-ray bright sources within cluster environment can be explained by two main phenomena: contributions from off-nuclear sources and/or AGN triggering caused by galaxy interactions rather than AGN fuelling. 
Uri: https://academic.oup.com/mnras/article/471/4/4990/4100620
Handle: http://hdl.handle.net/1887/58990
 

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