arXiv 0808.08892008-08-07astro-ph

发现中频峰值VERITAS Lac天体W Comae的> 200 GeV Gamma-ray发射

VERITAS Discovery of >200GeV Gamma-ray Emission from the Intermediate-frequency-peaked BL Lac Object W Comae

VERITAS Collaboration, V. A. Acciari, E. Aliu, M. Beilicke, W. Benbow, M. Boettcher, S. M. Bradbury, J. H. Buckley, V. Bugaev, Y. Butt, O. Celik, A. Cesarini, L… 展开作者

VERITAS Collaboration, V. A. Acciari, E. Aliu, M. Beilicke, W. Benbow, M. Boettcher, S. M. Bradbury, J. H. Buckley, V. Bugaev, Y. Butt, O. Celik, A. Cesarini, L. Ciupik, Y. C. K. Chow, P. Cogan, P. Colin, W. Cui, M. K. Daniel, T. Ergin, A. D. Falcone, S. J. Fegan, J. P. Finley, G. Finnegan, P. Fortin, L. F. Fortson, A. Furniss, D. Gall, G. H. Gillanders, J. Grube, R. Guenette, G. Gyuk, D. Hanna, E. Hays, J. Holder, D. Horan, C. M. Hui, T. B. Humensky, A. Imran, P. Kaaret, N. Karlsson, M. Kertzman, D. B. Kieda, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, K. Lee, G. Maier, A. McCann, M. McCutcheon, P. Moriarty, R. Mukherjee, T. Nagai, J. Niemiec, R. A. Ong, D. Pandel, J. S. Perkins, D. Petry, M. Pohl, J. Quinn, K. Ragan, L. C. Reyes, P. T. Reynolds, E. Roache, H. J. Rose, M. Schroedter, G. H. Sembroski, A. W. Smith, D. Steele, S. P. Swordy, J. A. Toner, V. V. Vassiliev, R. Wagner, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, R. J. White, D. A. Williams, S. A. Wissel, M. Wood, B. Zitzer

备注：: 7 pages, 4 figures, accepted by ApJL
DOI：: 10.1086/592244

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摘要：

我们报告的非常高的能量的伽玛射线发射的中频峰值BL Lacertae对象W Comae（z=0.102）的VERITAS检测。2008年1月至4月期间观察到了该来源。在3月中旬测量到一次强烈的伽马射线爆发，持续时间仅为4天。在两个最高耀斑夜晚测量的能谱符合幂律，并且非常陡峭，其微分光子谱指数为Gamma = 3.81 +-0.35_stat +-0.34_syst。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以用同步自康普顿（SSC）或外康普顿（EC）轻子喷流模型来描述，后者提供了一组更自然的参数来拟合数据。

英文摘要：

We report the detection of very high-energy gamma-ray emission from the intermediate-frequency-peaked BL Lacertae object W Comae (z=0.102) by VERITAS. The source was observed between January and April 2008. A strong outburst of gamma-ray emission was measured in the middle of March, lasting for only four 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 Gamma = 3.81 +- 0.35_stat +- 0.34_syst. The integral photon flux above 200GeV 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, with the latter offering a more natural set of parameters to fit the data.

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