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arXiv 0904.4422astro-ph.HE
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LS I +61 303与VERITAS、Swift和RXTE的多波长观测

Multiwavelength Observations of LS I +61 303 with VERITAS, Swift and RXTE

VERITAS Collaboration, V. A. Acciari, E. Aliu, T. Arlen, M. Bautista, M. Beilicke, W. Benbow, M. Bottcher, S. M. Bradbury, V. Bugaev, Y. Butt, Y. Butt, K. Byrum… 展开作者

VERITAS Collaboration, V. A. Acciari, E. Aliu, T. Arlen, M. Bautista, M. Beilicke, W. Benbow, M. Bottcher, S. M. Bradbury, V. Bugaev, Y. Butt, Y. Butt, K. Byrum0, A. Cannon, A. Cesarini, Y. C. Chow, L. Ciupik, P. Cogan, P. Colin, W. Cui, M. Daniel, R. Dickherber, T. Ergin, A. Falcone, S. J. Fegan, J. P. Finley, P. Fortin, L. 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, P. Kaaret, N. Karlsson, D. Kieda, J. Kildea, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, G. Maier, A. McCann, M. McCutcheon, J. Millis, P. Moriarty, R. Mukherjee, T. Nagai, R. A. Ong, A. N. Otte, D. Pandel, J. S. Perkins, J. S. Perkins, 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, M. Stroh, S. Swordy, M. Theiling, J. A. Toner, A. Varlotta, V. V. Vassiliev, R. G. Wagner, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinsteiny, R. J. White, D. A. Williams, S. Wissely, M. Woody, B. Zitzer

摘要:

我们目前的结果,从一个长期的监测活动的TeV的二进制LSI +61 303与VERITAS在能量超过500 GeV,并在2-10千电子伏的硬X射线波段与RXTE和雨燕,采样9个26.5天的轨道周期之间的2006年9月和2008年2月。VERITAS观测到二进制是可变的,所有综合观测结果在8.8 sigma(2006/2007)和7.3 sigma(2007/2008)的显着水平上检测到500 GeV以上的发射。该辐射源是在活动期间探测到的,其通量值在蟹状星云的5%到20%之间,在一个轨道周期内变化。此外,在2007-2008年观测季节进行的观测显示边际证据(在3.6西格玛的显着性水平)TeV的排放外的apastron通过的紧凑对象周围的Be星。RXTE和Swift同时进行的硬X射线观测显示出很大的变化性,在一个轨道周期内,通量值通常在0.5 ~ 3.0*10^-11尔格·cm^-2·s^-1之间变化。同期的X射线和TeV数据进行检查,它表明,TeV采样是不够密集,以检测两个波段之间的相关性。

英文摘要:

We present results from a long-term monitoring campaign on the TeV binary LSI +61 303 with VERITAS at energies above 500 GeV, and in the 2-10 keV hard X-ray bands with RXTE and Swift, sampling nine 26.5 day orbital cycles between September 2006 and February 2008. The binary was observed by VERITAS to be variable, with all integrated observations resulting in a detection at the 8.8 sigma (2006/2007) and 7.3 sigma (2007/2008) significance level for emission above 500 GeV. The source was detected during active periods with flux values ranging from 5 to 20% of the Crab Nebula, varying over the course of a single orbital cycle. Additionally, the observations conducted in the 2007-2008 observing season show marginal evidence (at the 3.6 sigma significance level) for TeV emission outside of the apastron passage of the compact object around the Be star. Contemporaneous hard X-ray observations with RXTE and Swift show large variability with flux values typically varying between 0.5 and 3.0*10^-11 ergs cm^-2 s^-1 over a single orbital cycle. The contemporaneous X-ray and TeV data are examined and it is shown that the TeV sampling is not dense enough to detect a correlation between the two bands.

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