NEAR-EQUIPARTITION JETS WITH LOG-PARABOLA ELECTRON ENERGY DISTRIBUTION AND THE BLAZAR SPECTRAL-INDEX DIAGRAMS | |
Dermer, CD; Yan DH(闫大海); Yan, DH; Zhang, L; Finke, JD; Lott, B | |
刊名 | ASTROPHYSICAL JOURNAL
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2015 | |
卷号 | 809期号:2页码:174 |
关键词 | acceleration of particles BL Lacertae objects: general galaxies: jets gamma rays: galaxies quasars: general radiation mechanisms: non-thermal |
英文摘要 | Fermi-LAT analyses show that the gamma-ray photon spectral indices Gamma(gamma) of a large sample of blazars correlate with the vF(v) peak synchrotron frequency ns according to the relation Gamma(gamma) =d-k log v(s). The same function, with different constants d and k, also describes the relationship between Gamma(gamma) and peak Compton frequency nC. This behavior is derived analytically using an equipartition blazar model with a log-parabola description of the electron energy distribution (EED). In the Thomson regime, k=k(EC)=3b/4 for external Compton (EC) processes and k=k(SSC)=9b/16for synchrotron self-Compton (SSC) processes, where b is the log-parabola width parameter of the EED. The BL Lac object Mrk 501 is fit with a synchrotron/SSC model given by the log-parabola EED, and is best fit away from equipartition. Corrections are made to the spectral-index diagrams for a low-energy power-law EED and departures from equipartition, as constrained by absolute jet power. Analytic expressions are compared with numerical values derived from self-Compton and EC scattered gamma-ray spectra from Lya broad-line region and IR target photons. The Gamma(gamma) versus ns behavior in the model depends strongly on b, with progressively and predictably weaker dependences on gamma-ray detection range, variability time, and isotropic gamma-ray luminosity. Implications for blazar unification and blazars as ultra-high energy cosmic-ray sources are discussed. Arguments by Ghisellini et al. that the jet power exceeds the accretion luminosity depend on the doubtful assumption that we are viewing at the Doppler angle. |
学科主题 | Astronomy & Astrophysics |
类目[WOS] | Astronomy & Astrophysics |
收录类别 | SCI |
WOS记录号 | WOS:000361655100067 |
公开日期 | 2016-05-03 |
内容类型 | 期刊论文 |
源URL | [http://ir.ihep.ac.cn/handle/311005/228715] ![]() |
专题 | 高能物理研究所_粒子天体物理中心 |
推荐引用方式 GB/T 7714 | Dermer, CD,Yan DH,Yan, DH,et al. NEAR-EQUIPARTITION JETS WITH LOG-PARABOLA ELECTRON ENERGY DISTRIBUTION AND THE BLAZAR SPECTRAL-INDEX DIAGRAMS[J]. ASTROPHYSICAL JOURNAL,2015,809(2):174. |
APA | Dermer, CD,闫大海,Yan, DH,Zhang, L,Finke, JD,&Lott, B.(2015).NEAR-EQUIPARTITION JETS WITH LOG-PARABOLA ELECTRON ENERGY DISTRIBUTION AND THE BLAZAR SPECTRAL-INDEX DIAGRAMS.ASTROPHYSICAL JOURNAL,809(2),174. |
MLA | Dermer, CD,et al."NEAR-EQUIPARTITION JETS WITH LOG-PARABOLA ELECTRON ENERGY DISTRIBUTION AND THE BLAZAR SPECTRAL-INDEX DIAGRAMS".ASTROPHYSICAL JOURNAL 809.2(2015):174. |
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