期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 392, 期 1, 页码 L40-L44出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1745-3933.2008.00584.x
关键词
quasars: individual: 3C 279; diffuse radiation; gamma-rays: observations; gamma-rays: theory
资金
- Seventh European Community
We revisit the limits of the level of the extragalactic background light (EBL) recently reported by the MAGIC collaboration based on the observed gamma-ray spectrum of the quasar 3C 279, considering the impact of absorption of high-energy gamma-ray photons inside the broad-line region (BLR) of the quasar. We use the photoionization code CLOUDY to calculate the expected optical-ultraviolet radiation field inside the BLR and the optical depth for a relatively extended set of the parameters. We found that the absorption of gamma-ray photons, though important for the estimate of the true radiative output of the source, does not produce an important hardening of the spectrum of 3C 279 in the energy band accessible by MAGIC, supporting the method used to infer the upper limits to the level of the EBL.
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