Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:0909.5057)
· References in the article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
γ-rays from the IC e+/- pair cascade in the radiation field of an accretion disc: application to Cen A
Authors:
Sitarek, J.; Bednarek, W.
Affiliation:
AA(Max-Planck-Institut für Physik, D-80805 München, Germany; University of Łódź, PL-90236 Łódź, Poland), AB(University of Łódź, PL-90236 Łódź, Poland)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 401, Issue 3, pp. 1983-1988. (MNRAS Homepage)
Publication Date:
01/2010
Origin:
MNRAS
MNRAS Keywords:
radiation mechanisms: non-thermal, galaxies: active, galaxies: individual: Cen A, gamma-rays: theory
Abstract Copyright:
(c) Journal compilation © 2010 RAS
DOI:
10.1111/j.1365-2966.2009.15785.x
Bibliographic Code:
2010MNRAS.401.1983S

Abstract

ABSTRACT The very short time-scale variability of TeV γ-ray emission from active galaxies suggests that the acceleration process of particles and the production of primary γ-rays likely occur relatively close to the accretion disc. We calculate the γ-ray spectra produced in an inverse Compton e+/- pair cascade initiated by primary γ-rays which are injected close to the surface of the accretion disc. Possible synchrotron energy losses of secondary cascade e+/- pairs are also taken into account. Since the soft radiation field is anisotropic, the resulting γ-ray spectra strongly depend on the observation angle. We investigate their basic properties for different parameters describing such a model. The model is applied to the misaligned blazar Cen A recently detected in the TeV γ-rays. We conclude on the site of the γ-ray emission region in Cen A based on the comparison of the model with the observations of this source in the GeV-TeV energy range.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints