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Luminous x-ray agn in clusters of galaxies | |
Manolis Plionis | |
Acceso Abierto | |
Atribución-NoComercial-SinDerivadas | |
Galaxies: active Galaxies: clusters: general X-rays: galaxies X-rays: galaxies: clusters X-rays: general | |
We present a study of X-ray AGN overdensities in 16 Abell clusters, within the redshift range 0.073 < z < 0.279, in order to investigate the effect of the hot inter-cluster environment on the triggering of the AGN phenomenon. The X-ray AGN overdensities, with respect to the field expectations, were estimated for sources with Lₓ≥ 10⁴² erg s⁻¹ (at the redshift of the clusters) and within an area of 1 h⁻¹₇₂ Mpc radius (excluding the core). To investigate the presence or not of a true enhancement of luminous X-ray AGN in the cluster area, we also derived the corresponding optical galaxy overdensities, using a suitable range of 𝑟-band magnitudes. We always find the latter to be significantly higher (and only in two cases roughly equal) with respect to the corresponding X-ray overdensities. Over the whole cluster sample, the mean X-ray point-source overdensity is a factor of ~ 4 less than that corresponding to bright optical galaxies, a difference which is significant at a > 0.995 level, as indicated by an appropriate t-student test. We conclude that the triggering of luminous X-ray AGN in rich clusters is strongly suppressed. Furthermore, searching for optical Sloan Digital Sky Survey (SDSS) counterparts of all the X-ray sources, associated with our clusters, we found that about half appear to be background QSOs, while others are background and foreground AGN or stars. The true overdensity of X-ray point sources, associated to the clusters, is therefore even smaller than what our statistical approach revealed. | |
The Astrophysical Journal Letters | |
2010-04 | |
Artículo | |
Inglés | |
Estudiantes Investigadores Público en general | |
Koulouridis, E. and Plionis, M., (2010), Luminous x-ray agn in clusters of galaxies, The Astrophysical Journal Letters, Vol. 714(2): L181-L184. | |
ASTRONOMÍA Y ASTROFÍSICA | |
Versión aceptada | |
acceptedVersion - Versión aceptada | |
Appears in Collections: | Artículos de Astrofísica |
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