Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-02-07
Astronomy and Astrophysics
Astrophysics
39 pages including 13 figures; data tables not included (see ApJ web version or contact author)
Scientific paper
10.1086/320970
Of the blazars detected by EGRET in GeV gamma rays, 3C 279 is not only the best-observed by EGRET, but also one of the best-monitored at lower frequencies. We have assembled eleven spectra, from GHz radio through GeV gamma rays, from the time intervals of EGRET observations. Although some of the data have appeared in previous publications, most are new, including data taken during the high states in early 1999 and early 2000. All of the spectra show substantial gamma-ray contribution to the total luminosity of the object; in a high state, the gamma-ray luminosity dominates over that at all other frequencies by a factor of more than 10. There is no clear pattern of time correlation; different bands do not always rise and fall together, even in the optical, X-ray, and gamma-ray bands. The spectra are modeled using a leptonic jet, with combined synchrotron self-Compton + external Compton gamma-ray production. Spectral variability of 3C 279 is consistent with variations of the bulk Lorentz factor of the jet, accompanied by changes in the spectral shape of the electron distribution. Our modeling results are consistent with the UV spectrum of 3C 279 being dominated by accretion disk radiation during times of low gamma-ray intensity.
Boettcher Markus
Hartman Robert C.
No associations
LandOfFree
Multi-Epoch Multiwavelength Spectra and Models for Blazar 3C~279 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Multi-Epoch Multiwavelength Spectra and Models for Blazar 3C~279, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-Epoch Multiwavelength Spectra and Models for Blazar 3C~279 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-89652