Hostname: page-component-5c6d5d7d68-pkt8n Total loading time: 0 Render date: 2024-08-17T21:33:13.435Z Has data issue: false hasContentIssue false
  • English
  • Français

Variability of CGRO/EGRET Gamma Ray Sources

Published online by Cambridge University Press:  12 April 2016

M. A. McLaughlin ,
J. R. Mattox ,
J. M. Cordes  and
D. J. Thompson
M. A. McLaughlin
Affiliation:
Astronomy Department, Cornell University
J. R. Mattox
Affiliation:
Astronomy Department, University of MarylandSpace Astronomy Program, Universities Space Research Association
J. M. Cordes
Affiliation:
Astronomy Department, Cornell University
D. J. Thompson
Affiliation:
Code 661, Laboratory for High Energy Astrophysics, NASA Goddard Space Flight Center

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We have developed a method for quantifying the flux variabilities of high energy gamma ray sources. We have applied this method to 128 sources listed in the second catalog of sources detected with the Energetic Gamma Ray Experiment Telescope (EGRET) (Thompson et. al. 1995). These sources include the Large Magellanic Cloud, 5 pulsars, 41 active galactic nuclei (AGN), and 81 sources not yet identified with known objects.

Our data include photon maps (E > 100 MeV) from 134 EGRET viewing periods spanning a roughly 3 year period. Each source was observed in 3-20 viewing periods ranging from a few days to 3 weeks in length. For each observation, a source flux was calculated using the method of maximum likelihood (Mattox et al. 1996) which simultaneously estimates the strength of the Galactic and isotropic diffuse emission, and that of a point source distributed as the EGRET point spread function.

Type
Part 5 High Energy Phenomena
Information
International Astronomical Union Colloquium , Volume 160: Pulsars: Problems and Progress , 1996 , pp. 357 - 358
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

Mattox, J.R. et al. 1996, ApJ, in pressGoogle Scholar
Press, W.H., Teukolsky, S.A., Vetterling, W.T. & Flannery, B.P. 1992, Numerical Recipes: The Art of Scientific Computing,(Cambridge: Cambridge University Press)Google Scholar
Thompson, D.J. et al. 1995, ApJS, 101, 259 Google Scholar