Constraining the Emission Properties of TeV Blazar H1426+428 by the Synchrotron-Self-Compton Model

Abstract

H1426+428 is one of blazars that are observed by $\gamma$-rays in the TeV region. Because TeV $\gamma$-rays from distant sources are subject to attenuation by the extragalactic background light (EBL) via electron-positron pair production, the intrinsic spectrum of the TeV $\gamma$-rays should be inferred by using the models of radiation processes and EBL spectrum. We set constraints on the physical condition of H1426+428 with the synchrotron-self-Compton model applying several EBL models. We find that the emission region of H1426+428 is moving toward us with the bulk Lorentz factor of $\sim 20$ and that its magnetic field strength is $\sim 0.1$ G. These properties are similar to other TeV blazars such as Mrk 421 and Mrk 501. However, the ratio of the energy density of nonthermal electrons to that of the magnetic fields is about 190 and fairly larger than those of Mrk 421 and Mrk 501, which are about 5 -- 20. It is also found that the intensity of EBL in the middle and near infrared wavelengths should be low, i.e., the intensity at 10 $\mu$m is about 1 nW m${}^{-2}$ sr${}^{-1}$ to account for the observed TeV $\gamma$-ray flux. Because the spectral data of H1426+428 in X-rays and $\gamma$-rays used in our analysis were not obtained simultaneously, further observations of TeV blazars are necessary to make the constraints on EBL more stringent.

arXiv comment12 pages, 5 figures, to be published in the Astrophysical Journal

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Cited by in corpus (5)

• Blazars as Ultra-High-Energy Cosmic-Ray Sources: Implications for TeV Gamma-Ray Observations
• The Parsec-Scale Jets of the TeV Blazars H 1426+428, 1ES 1959+650, and PKS 2155-304: 2001-2004
• A new ordering parameter of spectral energy distributions from synchrotron-self-Compton emitting blazars
• Simultaneous Swift and REM monitoring of the blazar PKS0537-441 in 2005
• Synchrotron Self-Compton Model for PKS 2155-304