Long-term Spectra of the Blazars Mrk 421 and Mrk 501 at TeV Energies Seen by HAWC-猫眼课题宝

DOI：

10.3847/1538-4357/ac58f6

发表时间：

2021-06

期刊：

The Astrophysical Journal

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中科院分区：

其他

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作者：

A. Albert;R. Alfaro;C. Álvarez;J. Camacho;J. C. Arteaga-Vel'azquez;K. Arunbabu;D. Rojas;H. Solares;V. Baghmanyan;Belmont-Moreno;K. Caballero-Mora;T. Capistr'an;A. Carramiñana;S. Casanova;U. Cotti;J. Cotzomi;S. C. D. Le'on;E. D. L. Fuente;R. Hernández;M. DuVernois;M. Durocher;J. C. D'iaz-V'elez;K. Engel;C. Espinoza;K. Fan;M. F. Alonso;N. Fraija;D. García;J. A. Garc'ia-Gonz'alez;F. Garfias;M. Gonz'alez;J. Goodman;J. P. Harding;B. Hona;D. Huang;F. Hueyotl-Zahuantitla;P. Huntemeyer;A. Iriarte;V. Joshi;A. Lara;W. Lee;J. Lee;H. L. Vargas;A. Longinotti;G. Luis-Raya;K. Malone;O. Martinez;J. Mart'inez-Castro;J. Matthews;P. Miranda-Romagnoli;E. Moreno;M. A. Mostafa;A. Nayerhoda;L. Nellen;M. Newbold;R. Noriega-Papaqui;A. Peisker;Y. Araujo;E. G. P'erez-P'erez-E.-G.-P'erez-P'erez-1382196238;C. Rho;D. R. 'alez;H. Salazar;F. Greus;A. Sandoval;M. Schneider;J. Serna-Franco;A. Smith;R. Springer;K. Tollefson;I. Torres;R. Torres-Escobedo;F. Ureña-Mena;L. Villaseñor;X. Wang;T. Weisgarber;E. Willox;H. Zhou;C. Le'on

高海拔水切伦科夫（HAWC）伽马射线天文台调查在300 GeV到>100 TeV能量范围内的非常高能量的天空。HAWC已经探测到两个11σ以上的耀变体，Markarian 421（Mrk 421）和Markarian 501（Mrk 501）。这些观察结果包括2015年6月至2018年7月期间采集的数据，导致1038天的暴露。在这项工作中，我们报告的时间平均光谱分析这两个源，0.5 TeV以上。考虑到河外背景光的通量衰减，Mrk 421的本征光谱符合幂律，能量截止指数α=2.26±0.12stat−0.2+0.17sys，能量截止Ec=5.1±1.6stat−2.5+1.4sys TeV。而Mrk 501的本征光谱可用指数α=2.61±0.11stat-0.07+0.01sys的简单幂律来描述。检测到的Mrk 421和Mrk 501信号的最大能量分别为9和12 TeV。这使得这些是迄今为止对多年时间尺度平均光谱的最高能量检测。由于对耀变体γ辐射的观测提供了有关其相对论喷流中发生的物理过程的信息，因此研究这些天体的宽带谱能量分布（SED）是非常重要的。为了这个目的，在伽马射线波段的X射线范围内的同期数据，以及在无线电到紫外线范围内的文献数据，被用来建立时间平均的SED，在同步加速器自康普顿轻子的情况下建模。

The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory surveys the very high-energy sky in the 300 GeV to >100 TeV energy range. HAWC has detected two blazars above 11σ, Markarian 421 (Mrk 421) and Markarian 501 (Mrk 501). The observations are comprised of data taken in the period between 2015 June and 2018 July, resulting in ∼1038 days of exposure. In this work, we report the time-averaged spectral analyses for both sources, above 0.5 TeV. Taking into account the flux attenuation due to the extragalactic background light, the intrinsic spectrum of Mrk 421 is described by a power law with an exponential energy cutoff with index α=2.26±0.12stat−0.2+0.17sys and energy cutoff Ec=5.1±1.6stat−2.5+1.4sys TeV, while the intrinsic spectrum of Mrk 501 is better described by a simple power law with index α=2.61±0.11stat−0.07+0.01sys . The maximum energies at which the Mrk 421 and Mrk 501 signals are detected are 9 and 12 TeV, respectively. This makes these some of the highest energy detections to date for spectra averaged over years-long timescales. Since the observation of gamma radiation from blazars provides information about the physical processes that take place in their relativistic jets, it is important to study the broadband spectral energy distributions (SEDs) of these objects. For this purpose, contemporaneous data in the gamma-ray band to the X-ray range, and literature data in the radio to UV range, were used to build time-averaged SEDs that were modeled within a synchrotron-self Compton leptonic scenario.

Long-term Spectra of the Blazars Mrk 421 and Mrk 501 at TeV Energies Seen by HAWC

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