Please use this identifier to cite or link to this item: http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1541
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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