VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multiwavelength Study
VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multiwavelength Study
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DOI：
10.3847/1538-4357/ab910e
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发表时间：
2020-05
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通讯作者：
A. Archer;W. Benbow;R. Bird;A. Brill;M. Buchovecky;J. Buckley;M. Carini;J. Christiansen;A. Chromey;M. Daniel;M. Errando;A. Falcone;Q. Feng;P. Fortin;L. Fortson;A. Furniss;A. Gent;M. Georganopoulos;G. Gillanders;C. Giuri;O. Gueta;D. Hanna;T. Hassan;O. Hervet;J. Holder;G. Hughes;T. Humensky;P. Kaaret;M. Kertzman;D. Kieda;F. Krennrich;M. Lang;T. T. Lin-T.;M. Lister;M. Lundy;G. Maier;E. Meyer;P. Moriarty;R. Mukherjee;D. Nieto;M. Nievas-Rosillo;S. O’Brien;R. Ong;K. Pfrang;M. Pohl;R. Prado;E. Pueschel;J. Quinn;K. Ragan;K. Ramirez;P. Reynolds;D. Ribeiro;G. Richards;E. Roache;C. Rulten;J. Ryan;A. Sadun;M. Santander;S. Scott;G. Sembroski;K. Shahinyan;R. Shang;B. Stevenson;V. Vassiliev;S. Wakely;A. Weinstein;P. Wilcox;A. Wilhelm;David A. Williams;T. Williamson
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作者：
A. Archer;W. Benbow;R. Bird;A. Brill;M. Buchovecky;J. Buckley;M. Carini;J. Christiansen;A. Chromey;M. Daniel;M. Errando;A. Falcone;Q. Feng;P. Fortin;L. Fortson;A. Furniss;A. Gent;M. Georganopoulos;G. Gillanders;C. Giuri;O. Gueta;D. Hanna;T. Hassan;O. Hervet;J. Holder;G. Hughes;T. Humensky;P. Kaaret;M. Kertzman;D. Kieda;F. Krennrich;M. Lang;T. T. Lin-T.;M. Lister;M. Lundy;G. Maier;E. Meyer;P. Moriarty;R. Mukherjee;D. Nieto;M. Nievas-Rosillo;S. O’Brien;R. Ong;K. Pfrang;M. Pohl;R. Prado;E. Pueschel;J. Quinn;K. Ragan;K. Ramirez;P. Reynolds;D. Ribeiro;G. Richards;E. Roache;C. Rulten;J. Ryan;A. Sadun;M. Santander;S. Scott;G. Sembroski;K. Shahinyan;R. Shang;B. Stevenson;V. Vassiliev;S. Wakely;A. Weinstein;P. Wilcox;A. Wilhelm;David A. Williams;T. Williamson
射电源3C 264由巨大的椭圆星系NGC 3862主持，在2017年2月至2019年5月期间使用甚高能辐射成像望远镜阵列系统（VERITAS）进行了观测。这些深入的观测发现了来自这个活跃星系的非常高能量（VHE; E > 100 GeV）的γ射线辐射。对质量选择的1057小时的实时时间的分析产生在源的位置处的检测，对应于高于背景的7.8个标准差的统计显著性。观测到的VHE通量在每月的时间尺度上是可变的，在2018年的观测中看到了一个升高的通量。在这个提升态的VHE辐射是以幂律谱来表征的，光子指数为Γ = 2.20 ± 0.27，通量F（>315 GeV）=（cm−2 s−1，约为蟹状星云通量的0.7%。3C 264（z = 0.0217）是VHE观测到的最遥远的射电星系，其被提升的状态被认为类似于M87中著名的喷流爆发。因此，在2018年VHE高状态时采集了大量同期多波长数据。分析这些数据，包括甚长基线阵列，甚大阵列，哈勃太空望远镜，钱德拉，和斯威夫特观测除了VERITAS数据，提出，沿着讨论所产生的光谱能量分布。
The radio source 3C 264, hosted by the giant elliptical galaxy NGC 3862, was observed with the Very Energetic Radiation Imaging Telescope Array System (VERITAS) between 2017 February and 2019 May. These deep observations resulted in the discovery of very high energy (VHE; E > 100 GeV) γ-ray emission from this active galaxy. An analysis of ∼57 hr of quality-selected live time yields a detection at the position of the source, corresponding to a statistical significance of 7.8 standard deviations above background. The observed VHE flux is variable on monthly timescales, with an elevated flux seen in 2018 observations. The VHE emission during this elevated state is well characterized by a power-law spectrum with a photon index Γ = 2.20 ± 0.27 and flux F(>315 GeV) = ( cm−2 s−1, or approximately 0.7% of the Crab Nebula flux above the same threshold. 3C 264 (z = 0.0217) is the most distant radio galaxy detected at VHE, and the elevated state is thought to be similar to that of the famously outbursting jet in M87. Consequently, extensive contemporaneous multiwavelength data were acquired in 2018 at the time of the VHE high state. An analysis of these data, including Very Long Baseline Array, Very Large Array, Hubble Space Telescope, Chandra, and Swift observations in addition to the VERITAS data, is presented, along with a discussion of the resulting spectral energy distribution.