Variability and Beaming of GeV Gamma-Ray-Loud Blazars
| Autor: | Luo-En Chen, Li Ma, Zhou SB(周曙白), Zhao-Hua Xie, Guang-Zhong Xie |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Physics
Astrophysics::High Energy Astrophysical Phenomena Astronomy Astronomy and Astrophysics Astrophysics Black hole General Relativity and Quantum Cosmology symbols.namesake Binary black hole Rotating black hole Space and Planetary Science Intermediate-mass black hole Eddington luminosity symbols Stellar black hole Spin-flip Blazar |
| Zdroj: | Publications of the Astronomical Society of Japan. 55:933-937 |
| ISSN: | 2053-051X 0004-6264 |
| Popis: | Considering the Klein-Nishina effects for high-energy gamma-ray emissions, we derived a corrected form of the basic Elliot-Shapiro formula. Two new lower limits to the time scales of the variability expected from an accreting Schwarzschild black hole and Kerr black hole were derived, respectively. For a sample of 25 GeV gamma-ray-loud blazars known to have the shortest time scales of flux variability, t(min), we studied the corrected Elliot-Shapiro relations between t(min) and the GeV gamma-ray luminosities in both the high and low states, respectively. We observe that: (1) No sources have been observed to have GeV gamma-ray luminosities in the low state above the corrected Eddington limit being produced by a Kerr black hole and a Schwarzschild black hole. (2) Only one source has been observed to have a luminosity in the high state above the corrected Eddington limit being produced by a Kerr black hole and a Schwarzschild black hole, which is a new argument for not invoking relativistic beaming models for the present EGRET observational data alone. Our conclusion is that if one considers the Klein-Nishina effect, the evidence for beamed emission from the present gamma-ray data alone is weak. Obviously, our conclusion is consistent with that of Dermer and Gehrels (1995, ApJ, 447, 103), but it is a new independent evidence. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|