VERITAS Discovery of >200 GeV Gamma-Ray Emission from the Intermediate-Frequency-Peaked BL Lacertae Object W Comae

VERITAS Discovery of >200 GeV Gamma-Ray Emission from the Intermediate-Frequency-Peaked BL Lacertae Object W Comae
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DOI：
10.1086/592244
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发表时间：
2008-08
期刊：
The Astrophysical Journal Letters
影响因子：
--
通讯作者：
V. C. V. Acciari-V.-C.-V.-Acciari-2077280781;E. Aliu;M. Beilicke;W. Benbow;M. Boettcher;S. Bradbury;J. Buckley;V. Bugaev;Y. Butt;O. Celik;A. Cesarini;L. Ciupik;Y. Chow;P. Cogan;P. Colin;W. Cui;M. Daniel;T. Ergin;A. Falcone;S. Fegan;J. Finley;G. Finnegan;P. Fortin;L. Fortson;A. Furniss;D. Gall;G. Gillanders;J. Grube;R. Guenette;G. Gyuk;D. Hanna;E. Hays;J. Holder;D. Horan;C. Hui;T. Humensky;A. Imran;P. Kaaret;N. Karlsson;M. Kertzman;D. Kieda;A. Konopelko;H. Krawczynski;F. Krennrich;M. Lang;S. LeBohec;K. Lee;G. Maier;A. McCann;M. McCutcheon;P. Moriarty;R. Mukherjee;T. Nagai;J. Niemiec;R. Ong;D. Pandel;J. Perkins;D. Petry;M. Pohl;J. Quinn;K. Ragan;L. Reyes;P. Reynolds;E. Roache;H. Rose;M. Schroedter;G. Sembroski;A. Smith;D. Steele;S. Swordy;J. Toner;V. Vassiliev;R. Wagner;S. Wakely;J. Ward;T. Weekes;A. Weinstein;R. White;D. Williams;S. Wissel;M. Wood;B. Zitzer
V. C. V. Acciari-V.-C.-V.-Acciari-2077280781;E. Aliu;M. Beilicke;W. Benbow;M. Boettcher;S. Bradbury;J. Buckley;V. Bugaev;Y. Butt;O. Celik;A. Cesarini;L. Ciupik;Y. Chow;P. Cogan;P. Colin;W. Cui;M. Daniel;T. Ergin;A. Falcone;S. Fegan;J. Finley;G. Finnegan;P. Fortin;L. Fortson;A. Furniss;D. Gall;G. Gillanders;J. Grube;R. Guenette;G. Gyuk;D. Hanna;E. Hays;J. Holder;D. Horan;C. Hui;T. Humensky;A. Imran;P. Kaaret;N. Karlsson;M. Kertzman;D. Kieda;A. Konopelko;H. Krawczynski;F. Krennrich;M. Lang;S. LeBohec;K. Lee;G. Maier;A. McCann;M. McCutcheon;P. Moriarty;R. Mukherjee;T. Nagai;J. Niemiec;R. Ong;D. Pandel;J. Perkins;D. Petry;M. Pohl;J. Quinn;K. Ragan;L. Reyes;P. Reynolds;E. Roache;H. Rose;M. Schroedter;G. Sembroski;A. Smith;D. Steele;S. Swordy;J. Toner;V. Vassiliev;R. Wagner;S. Wakely;J. Ward;T. Weekes;A. Weinstein;R. White;D. Williams;S. Wissel;M. Wood;B. Zitzer
中科院分区：
其他
文献类型：
--
作者：
V. C. V. Acciari-V.-C.-V.-Acciari-2077280781;E. Aliu;M. Beilicke;W. Benbow;M. Boettcher;S. Bradbury;J. Buckley;V. Bugaev;Y. Butt;O. Celik;A. Cesarini;L. Ciupik;Y. Chow;P. Cogan;P. Colin;W. Cui;M. Daniel;T. Ergin;A. Falcone;S. Fegan;J. Finley;G. Finnegan;P. Fortin;L. Fortson;A. Furniss;D. Gall;G. Gillanders;J. Grube;R. Guenette;G. Gyuk;D. Hanna;E. Hays;J. Holder;D. Horan;C. Hui;T. Humensky;A. Imran;P. Kaaret;N. Karlsson;M. Kertzman;D. Kieda;A. Konopelko;H. Krawczynski;F. Krennrich;M. Lang;S. LeBohec;K. Lee;G. Maier;A. McCann;M. McCutcheon;P. Moriarty;R. Mukherjee;T. Nagai;J. Niemiec;R. Ong;D. Pandel;J. Perkins;D. Petry;M. Pohl;J. Quinn;K. Ragan;L. Reyes;P. Reynolds;E. Roache;H. Rose;M. Schroedter;G. Sembroski;A. Smith;D. Steele;S. Swordy;J. Toner;V. Vassiliev;R. Wagner;S. Wakely;J. Ward;T. Weekes;A. Weinstein;R. White;D. Williams;S. Wissel;M. Wood;B. Zitzer

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本文报道了用VERITAS探测器探测到的中频率峰值的BL型蝎虎座天体W Comae（z = 0.102）的甚高能γ射线辐射。2008年1月至4月期间观察到该来源。3月中旬测得一次强烈的γ射线爆发，持续时间仅为4天。在两个最高耀斑夜测得的能谱用幂律拟合，发现非常陡峭，微分光子谱指数为Γ = 3.81 ± 0.35stat± 0.34syst。在这两个夜晚，超过200 GeV的积分光子通量大约相当于蟹状星云通量的9%。在X射线能量下的准同步Swift观测是由VERITAS观测触发的。耀斑数据的光谱能量分布可用同步辐射自康普顿（SSC）或外康普顿（EC）轻子喷流模型描述。
We report the detection of very high energy γ-ray emission from the intermediate-frequency-peaked BL Lacertae object W Comae (z = 0.102) by VERITAS. The source was observed between 2008 January and April. A strong outburst of γ-ray emission was measured in the middle of March, lasting for only 4 days. The energy spectrum measured during the two highest flare nights is fit by a power law and is found to be very steep, with a differential photon spectral index of Γ = 3.81 ± 0.35stat± 0.34syst. The integral photon flux above 200 GeV during those two nights corresponds to roughly 9% of the flux from the Crab Nebula. Quasi-simultaneous Swift observations at X-ray energies were triggered by the VERITAS observations. The spectral energy distribution of the flare data can be described by synchrotron self-Compton (SSC) or external Compton (EC) leptonic jet models.