Gamma-ray-loud blazars and beaming
Gamma-ray-loud blazars and beaming
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DOI：
10.1093/mnras/273.3.583
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发表时间：
1995-04
影响因子：
4.8
通讯作者：
L. Dondi;G. Ghisellini
中科院分区：
文献类型：
--
作者：
L. Dondi;G. Ghisellini
We study the entire sample of quasars detected above 100 MeV (by the EGRET instrument), on boardCGRO. We find that theγ-ray luminosity correlates better with the radio luminosity than with the optical or X-ray luminosity, even if the different variability behaviour indicates different emission regions. A strong correlation is also found between the broad-band spectral indices αro, connecting the radio and the optical fluxes, and αoγ, connecting the optical and theγ-ray fluxes. Theγ-ray luminosity in BLLac objects is on average much less dominant than in the other sources. With the requirement that theγ-rays do not interact with X-rays (assumed cospatial) through photon-photon collisions, we calculate the lower limit on the Doppler or beaming factor of theγ-ray emission region for a large fraction of the sources of the sample, finding that relativistic motion is required in all cases.
