Por favor, use este identificador para citar o enlazar este ítem:
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 | |
| Aparece en las colecciones: | Artículos de Astrofísica |
Cargar archivos:
| Fichero | Tamaño | Formato | |
|---|---|---|---|
| 42.-A.pdf | 320.22 kB | Adobe PDF | Visualizar/Abrir |