SIMBAD references

2001ApJ...556L..75M - Astrophys. J., 556, L75-L78 (2001/August-1)

A composite Seyfert 2 X-ray spectrum: implications for the origin of the cosmic X-ray background.

MORAN E.C., KAY L.E., DAVIS M., FILIPPENKO A.V. and BARTH A.J.

Abstract (from CDS):

We present a composite 1-10 keV Seyfert 2 X-ray spectrum derived from ASCA observations of a distance-limited sample of nearby galaxies. All 29 observed objects were detected. Above ∼3 keV, the composite spectrum is inverted, confirming that Seyfert 2 galaxies as a class have the spectral properties necessary to explain the flat shape of the cosmic X-ray background spectrum. Integrating the composite spectrum over redshift, we find that the total emission from Seyfert 2 galaxies, combined with the expected contribution from unabsorbed type 1 objects, provides an excellent match to the spectrum and intensity of the hard X-ray background. The principal uncertainty in this procedure is the cosmic evolution of the Seyfert 2 X-ray luminosity function. Separate composite spectra for objects in our sample with and without polarized broad optical emission lines are also presented.

Abstract Copyright:

Journal keyword(s): Galaxies: Seyfert - X-Rays: Diffuse Background - X-Rays: Galaxies

Simbad objects: 32

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2001ApJ...556L..75M and select 'bookmark this link' or equivalent in the popup menu


2020.10.31-18:15:55

© Université de Strasbourg/CNRS

    • Contact