LONG TERM OBSERVATIONS OF B2 1215+30 WITH VERITAS
LONG TERM OBSERVATIONS OF B2 1215+30 WITH VERITAS
复制标题
使用 VERITAS 对 B2 1215 30 进行长期观察
DOI：
10.1088/0004-637x/779/2/92
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
and J. Jadhav
中科院分区：
文献类型：
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作者：
E. Aliu;S. Archambault;T. Arlen;T. Aune;M. Beilicke;W. Benbow;R. Bird;A. Bouvier;J. Buckley;V. Bugaev;A. Cesarini;L. Ciupik;M. Connolly;W. Cui;J. Dumm;M. Errando;A. Falcone;S. Federici;Q. Feng;J. Finley;P. Fortin;L. Fortson;A. Furniss;N. Galante;L. G'erard;G. Gillanders;S. Griffin;J. Grube;G. Gyuk;D. Hanna;J. Holder;G. Hughes;T. Humensky;P. Kaaret;M. Kertzman;Y. Khassen;D. Kieda;H. Krawczynski;F. Krennrich;M. Lang;A. Madhavan;G. Maier;P. Majumdar;S. McArthur;A. McCann;P. Moriarty;R. Mukherjee;D. Nieto;A. O. D. Bhróithe;R. Ong;M. Orr;A. Otte;N. Park;J. Perkins;M. Pohl;A. Popkow;H. Prokoph;J. Quinn;K. Ragan;L. Reyes;P. Reynolds;G. Richards;E. Roache;D. Saxon;G. Sembroski;C. Skole;A. Smith;M. Soares;D. Staszak;I. Telezhinsky;G. Tesic;M. Theiling;A. Varlotta;V. Vassiliev;S. Vincent;S. Wakely;T. Weekes;A. Weinstein;R. Welsing;D. Williams;A. Zitzer;M. Böttcher;M. Fumagalli;and J. Jadhav
我们报告了2008年至2012年期间对BL Lac天体B2 1215+30的VERITAS观测。在此期间，VERITAS在非常高的能量（VHEs; E > 100 GeV）下探测到该源，其显著性为8.9σ，并在大于数月的时间尺度上显示出明显的变化。在2011年，该源被发现处于一个相对明亮的状态，并根据幂律拟合的微分光子谱得出光谱指数为3.6 ± 0.4stat ± 0.3syst，200 GeV以上的积分通量为（8.0 ± 0.9stat ± 3.2syst）× 10−12 cm−2 s−1。在2011年的明亮状态中没有检测到短期变化。多波长数据是在2011年VERITAS观测的同时获得的，涵盖光学（Super-LOTIS，MDM，Swift/UVOT），X射线（Swift/XRT）和伽马射线（Fermi-LAT）频率。这些用于构建B2 1215+30的光谱能量分布（SED）。使用一区轻子模型来模拟耀变体发射，并将结果与2011年初的MAGIC和其他VERITAS检测到的耀变体进行比较。使用VHE检测到的BL Lac天体的典型模型参数可以很好地再现SED。
We report on VERITAS observations of the BL Lac object B2 1215+30 between 2008 and 2012. During this period, the source was detected at very high energies (VHEs; E > 100 GeV) by VERITAS with a significance of 8.9σ and showed clear variability on timescales larger than months. In 2011, the source was found to be in a relatively bright state and a power-law fit to the differential photon spectrum yields a spectral index of 3.6 ± 0.4stat ± 0.3syst with an integral flux above 200 GeV of (8.0 ± 0.9stat ± 3.2syst) × 10−12 cm−2 s−1. No short term variability could be detected during the bright state in 2011. Multi-wavelength data were obtained contemporaneously with the VERITAS observations in 2011 and cover optical (Super-LOTIS, MDM, Swift/UVOT), X-ray (Swift/XRT), and gamma-ray (Fermi-LAT) frequencies. These were used to construct the spectral energy distribution (SED) of B2 1215+30. A one-zone leptonic model is used to model the blazar emission and the results are compared to those of MAGIC from early 2011 and other VERITAS-detected blazars. The SED can be reproduced well with model parameters typical for VHE-detected BL Lac objects.