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The XMM-Newton survey of the ELAIS-S1 field. I: Number counts, angular correlation function and X-ray spectral properties | | S. Puccetti
; F. Fiore
; V. D’Elia
; I. Pillitteri
; C. Feruglio
; A. Grazian
; M. Brusa
; P. Ciliegi
; A. Comastri
; C. Gruppioni
; M. Mignoli
; C. Vignali
; G. Zamorani
; F. La Franca
; N. Sacchi
; A. Franceschini
; S. Berta
; H. Buttery
; J.E. Dias
; | | Date: |
6 Jul 2006 | | Abstract: | We have surveyed with XMM-Newton the central ~0.6 deg2 region of the ELAIS-S1 field down to flux limits of ~5.5X10-16 cgs (0.5-2 keV, S band), ~2X10-15 cgs (2-10 keV, H band), and ~4X10-15 cgs (5-10 keV, HH band). We detect a total of 478 sources, 395 and 205 of which detected in the S and H bands respectively. We identified 7 clearly extended sources and estimated their redshift through X-ray spectral fits with thermal models. In four cases the redshift is consistent with z=0.4. We have computed the angular correlation function of the sources in the S and H bands, finding best fit correlation angles theta_0=5.2+/-3.8 arcsec and theta_0=12.8+/-7.8 arcsec respectively. A rough estimate of the present-day correlation length r_0 can be obtained inverting the Limber equation and assuming an appropriate redshift distribution dN/dz. The results range between 12.8 and 9.8 h-1 Mpc in the S band and between 17.9 and 13.4 h-1 Mpc in the H band, with 30-40% statistical errors, assuming either smooth redshift distributions or redshift distributions with spikes accounting for the presence of a structure at z=0.4. The relative density of the S band sources is higher near the clusters and groups at z~0.4 and extends toward East and toward South/West. This suggests that the structure is complex, with a size comparable to the full XMM-Newton field. Conversely, the highest relative source densities of the H band sources are located in the central-west region of the field. | | Source: | arXiv, astro-ph/0607107 | | Services: | Forum | Review | PDF | Favorites | |
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