منابع مشابه
The Parameters of the Gamma - Ray Emission Region in Mrk 501
We determine the physical parameters (magnetic eld and Doppler factor) of the homogeneous synchrotron self-Compton model allowed by the observed X{ray to gamma-ray spectra and variability of Markarian 501 during the 15{16 April 1997 aring activity. We nd that, for 20 minute variability, a magnetic eld of 0.2 G and a Doppler factor of 20 could t these observations. We take account of photon-phot...
متن کاملSearch for an extended VHE γ-ray emission from Mrk 421 and Mrk 501 with the MAGIC Telescope
Context. Part of the very high energy γ-ray radiation coming from extragalactic sources is absorbed through the pair production process on the extragalactic background light photons. Extragalactic magnetic fields alter the trajectories of these cascade pairs and, in turn, convert cosmic background photons to γ-ray energies by inverse Compton scattering. These secondary photons can form an exten...
متن کاملIntrinsic Spectra of the TeV Blazars Mrk 421 and Mrk 501
Energy spectra of γ-ray blazars may contain an imprint from the cosmic infrared background radiation due to γ-ray absorption (pair-production) by soft photons constituting the extragalactic background light (EBL). The signature of this imprint depends on the spectral shape of the EBL. In this work we correct the observed spectra of Mrk 421 and Mrk 501 for absorption using different possible rea...
متن کاملLong - Term X - Ray and Tev Variability of Mrk 501
We present X-ray observations of the nearby TeV blazar Mrk 501 obtained with RXTE during 1997, 1998, 1999, 2000, and 2004. The goal of this study is twofold: 1) characterize the long-term X-ray flux and spectral variability of the source with a model-independent analysis, and 2) investigate the X-ray and TeV correlation on long timescales (> days). Significant spectral variations were observed ...
متن کاملA Study of High Energy Emission from the TeV blazar Mrk 501 during Multiwavelength Observations in 1996
We present the results of a multiwavelength campaign for Mrk 501 performed in March 1996 with ASCA, EGRET , Whipple, and optical telescopes. The X–ray flux observed with ASCA was 5 times higher than the quiescent level and gradually decreased by a factor of 2 during the observation in March 1996. In the X–ray band, a spectral break was observed around 2 keV. We report here for the first time th...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2001
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20000538