GAMMA-RAY STUDIES OF BLAZARS: SYNCHRO-COMPTON ANALYSIS OF FLAT SPECTRUM RADIO QUASARS
GAMMA-RAY STUDIES OF BLAZARS: SYNCHRO-COMPTON ANALYSIS OF FLAT SPECTRUM RADIO QUASARS
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DOI：
10.1088/0004-637x/692/1/32
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发表时间：
2008-08
期刊：
影响因子：
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通讯作者：
C. Dermer;J. Finke;H. Krug;M. Boettcher
中科院分区：
文献类型：
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作者：
C. Dermer;J. Finke;H. Krug;M. Boettcher
我们扩展了一种方法，包括外部康普顿（EC）的过程，用于建模同步加速器和同步加速器自康普顿辐射在耀变体喷流。基本的模型假设是，通过软X射线通量的耀变体射电是由各向同性分布的电子在流出的相对论耀变体喷流等离子体的随机定向磁场中发射的非热同步辐射。因此，电子分布由同步辐射光谱给出，只取决于多普勒因子δD和平均磁场B，给定共动发射区尺寸尺度R′b <$cδDtv/（1 + z），其中tv是变化时间，z是源红移。将Georganopoulos，Kirk和Mastichiadis的方法推广到任意各向异性目标辐射场，我们使用同步加速器组件所隐含的电子谱来获得精确的康普顿散射γ射线谱，贯穿EC散射过程的Thomson和Klein-Nishina区域。我们推导并计算了由相对论电子产生的精确γ射线谱，这些相对论电子康普顿散射（1）位于喷流径向后方的辐射点源，（2）来自热Shakura-Sunyaev吸积盘的光子，以及（3）来自中心源的目标光子被宽线区气体的球对称壳散射。给出了从射电到γ射线的宽带谱能量分布的计算，其中包括在为康普顿散射提供目标光子的同一辐射场上的自洽γγ吸收。鉴于γ射线望远镜和同期多波长活动的数据，考虑了这种基线平谱射电/γ射线类星体模型的应用。
We extend a method for modeling synchrotron and synchrotron self-Compton radiations in blazar jets to include external Compton (EC) processes. The basic model assumption is that the blazar radio through soft X-ray flux is nonthermal synchrotron radiation emitted by isotropically distributed electrons in the randomly directed magnetic field of outflowing relativistic blazar jet plasma. Thus, the electron distribution is given by the synchrotron spectrum, depending only on the Doppler factor δD and the mean magnetic field B, given that the comoving emission region size scale R′b ≲ cδDtv/(1 + z), where tv is the variability time and z is the source redshift. Generalizing the approach of Georganopoulos, Kirk, & Mastichiadis to arbitrary anisotropic target radiation fields, we use the electron spectrum implied by the synchrotron component to derive accurate Compton-scattered γ-ray spectra throughout the Thomson and Klein–Nishina regimes for EC scattering processes. We derive and calculate accurate γ-ray spectra produced by relativistic electrons that Compton-scatter (1) a point source of radiation located radially behind the jet, (2) photons from a thermal Shakura–Sunyaev accretion disk, and (3) target photons from the central source scattered by a spherically symmetric shell of broad-line region gas. The calculations of broadband spectral energy distributions from the radio through γ-ray regimes are presented, which include self-consistent γγ absorption on the same radiation fields that provide target photons for Compton scattering. The application of this baseline flat spectrum radio/γ-ray quasar model is considered in view of data from γ-ray telescopes and contemporaneous multiwavelength campaigns.