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arXiv 1105.0449astro-ph.HE
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2008-2010年TeV双星LS I +61 303的VERITAS观测

VERITAS Observations of the TeV Binary LS I +61 303 During 2008-2010

V. A. Acciari, E. Aliu, T. Arlen, T. Aune, M. Beilicke, W. Benbow, S. M. Bradbury, J. H. Buckley, V. Bugaev, K. Byrum, A. Cannon, A. Cesarini, L. Ciupik, E. Col… 展开作者

V. A. Acciari, E. Aliu, T. Arlen, T. Aune, M. Beilicke, W. Benbow, S. M. Bradbury, J. H. Buckley, V. Bugaev, K. Byrum, A. Cannon, A. Cesarini, L. Ciupik, E. Collins-Hughes, M. P. Connolly, W. Cui, R. Dickherber, C. Duke, M. Errando, A. Falcone, J. P. Finley, G. Finnegan, L. Fortson, A. Furniss, N. Galante, D. Gall, G. H. Gillanders, S. Godambe, S. Griffin, J. Grube, R. Guenette, G. Gyuk, D. Hanna, J. Holder, G. Hughes, C. M. Hui, T. B. Humensky, P. Kaaret, N. Karlsson, M. Kertzman, D. Kieda, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, G. Maier, P. Majumdar, S. McArthur, A. McCann, P. Moriarty, R. Mukherjee, R. A. Ong, M. Orr, A. N. Otte, N. Park, J. S. Perkins, M. Pohl, H. Prokoph, J. Quinn, K. Ragan, L. C. Reyes, P. T. Reynolds, E. Roache, H. J. Rose, J. Ruppel, D. B. Saxon, M. Schroedter, G. H. Sembroski, G. Demet Senturk, A. W. Smith, D. Staszak, G. Tesic, M. Theiling, S. Thibadeau, K. Tsurusaki, A. Varlotta, V. V. Vassiliev, S. Vincent, M. Vivier, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, T. Weisgarber, D. A. Williams, B. Zitzer

摘要:

我们提出的观测结果的TeV二进制LS I +61 303与VERITAS望远镜阵列之间的2008年和2010年,在能量超过300 GeV。过去,地面伽玛射线望远镜VERITAS和MAGIC都曾报告在双星轨道的离星阶段附近探测到TeV辐射。这里的观测结果显示,在这些轨道阶段没有强有力的证据TeV排放;然而,在2010年底进行的观测中,在5.6标准差(5.6 sigma)的试验后显着性下,在接近优合阶段(更接近近星点通过)的源中检测到显着的排放。总体而言,2008年10月至2010年12月期间,VERITAS在LS I +61 303上累积的总暴露时间为64.5小时,导致整个综合数据集中恒定发射的3.3 sigma显著性水平超额。在以前可靠的活跃TeV阶段(即接近apastron)的发射导出的通量上限小于5%的蟹状星云通量在相同的能量范围内。这一结果与MAGIC和VERITAS之前的观测结果形成了明显的对比,MAGIC和VERITAS在蟹状星云流量的10%以上的这些阶段检测到了源。在为期两年的观测期间,斯威夫特X射线望远镜(XRT)和罗西X射线定时探测器定时(RXTE)正比计数器阵列(PCA)也在LS I +61 303上积累了大量的X射线数据。我们发现没有证据表明在20个直接重叠的观测过程中,在X射线和TeV制度的排放之间的相关性。我们还评论了费米大面积望远镜(LAT)同时获得的数据。

英文摘要:

We present the results of observations of the TeV binary LS I +61 303 with the VERITAS telescope array between 2008 and 2010, at energies above 300 GeV. In the past, both ground-based gamma-ray telescopes VERITAS and MAGIC have reported detections of TeV emission near the apastron phases of the binary orbit. The observations presented here show no strong evidence for TeV emission during these orbital phases; however, during observations taken in late 2010, significant emission was detected from the source close to the phase of superior conjunction (much closer to periastron passage) at a 5.6 standard deviation (5.6 sigma) post-trials significance. In total, between October 2008 and December 2010 a total exposure of 64.5 hours was accumulated with VERITAS on LS I +61 303, resulting in an excess at the 3.3 sigma significance level for constant emission over the entire integrated dataset. The flux upper limits derived for emission during the previously reliably active TeV phases (i.e. close to apastron) are less than 5% of the Crab Nebula flux in the same energy range. This result stands in apparent contrast to previous observations by both MAGIC and VERITAS which detected the source during these phases at >10% of the Crab Nebula flux. During the two year span of observations, a large amount of X-ray data were also accrued on LS I +61 303 by the Swift X-ray Telescope (XRT) and the Rossi X-ray Timing Explorer Timing (RXTE) Proportional Counter Array (PCA). We find no evidence for a correlation between emission in the X-ray and TeV regimes during 20 directly overlapping observations. We also comment on data obtained contemporaneously by the Fermi Large Area Telescope (LAT).

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