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arXiv 1005.0032astro-ph.HE
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SNR +0.3的$γ$射线发射的发现

Discovery of VHE $γ$-ray emission from the SNR G54.1+0.3

V. A. Acciari, E. Aliu, T. Arlen, T. Aune, M. Bautista, M. Beilicke, W. Benbow, D. Boltuch, S. M. Bradbury, J. H. Buckley, V. Bugaev, Y. Butt, K. Byrum, A. Cesa… 展开作者

V. A. Acciari, E. Aliu, T. Arlen, T. Aune, M. Bautista, M. Beilicke, W. Benbow, D. Boltuch, S. M. Bradbury, J. H. Buckley, V. Bugaev, Y. Butt, K. Byrum, A. Cesarini, L. Ciupik, W. Cui, R. Dickherber, C. Duke, J. P. Finley, G. Finnegan, L. Fortson, A. Furniss, N. Galante, D. Gall, G. H. Gillanders, S. Godambe, E. V. Gotthelf, J. Grube, R. Guenette, G. Gyuk, D. Hanna, J. Holder, C. M. Hui, T. B. Humensky, A. Imran, P. Kaaret, N. Karlsson, M. Kertzman, D. Kieda, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, G. Maier, S. McArthur, A. McCann, M. McCutcheon, P. Moriarty, R. Muhkerjee, R. A. Ong, A. N. Otte, D. Pandel, 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, G. Demet Senturk, P. Slane, A. W. Smith, D. Steele, S. P. Swordy, G. Těsić, M. Theiling, S. Thibadeau, V. V. Vassiliev, S. Vincent, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, T. Weisgarber, D. A. Williams, S. Wissel, M. Wood, B. Zitzer

摘要:

我们报告的发现非常高的能量伽马射线发射的SNR G54.1+0.3的方向使用VERITAS地基伽马射线天文台。TeV信号的总体显著性为6.8 $σ$,并且在仪器分辨率为5 $^{arcminute}$的情况下呈现点状。超过1 TeV的积分通量是蟹状星云通量的2.5%,在250 GeV和4 TeV之间测量到显著的发射,可以用幂律能谱dN/dE $\sim$ E $^{-Γ}$和光子指数$Γ= 2.39\pm0.23_{stat}\pm0.30_{sys}$来描述。我们没有发现证据的时间变化之间的观测跨越近两年。基于位置,形态,测量的光谱,缺乏可变性和与以前在TeV波段检测到的类似系统的比较,这个新的VHE伽马射线源最有可能的对应物是SNR G54.1+0.3的PWN。测量到的X射线与VHE伽马射线的光度比是所有被认为是由年轻的旋转动力恒星驱动的星云中最低的,这可能表明粒子主导的PWN。

英文摘要:

We report the discovery of very high energy gamma-ray emission from the direction of the SNR G54.1+0.3 using the VERITAS ground-based gamma-ray observatory. The TeV signal has an overall significance of 6.8$σ$ and appears point-like given the 5$^{arcminute}$ resolution of the instrument. The integral flux above 1 TeV is 2.5% of the Crab Nebula flux and significant emission is measured between 250 GeV and 4 TeV, well described by a power-law energy spectrum dN/dE $\sim$ E$^{-Γ}$ with a photon index $Γ= 2.39\pm0.23_{stat}\pm0.30_{sys}$. We find no evidence of time variability among observations spanning almost two years. Based on the location, the morphology, the measured spectrum, the lack of variability and a comparison with similar systems previously detected in the TeV band, the most likely counterpart of this new VHE gamma-ray source is the PWN in the SNR G54.1+0.3. The measured X-ray to VHE gamma-ray luminosity ratio is the lowest among all the nebulae supposedly driven by young rotation-powered pulsars, which could indicate a particle-dominated PWN.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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