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arXiv 1608.02769astro-ph.HE
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1 ES 1440+122中甚高能γ射线的发现

Discovery of Very High Energy Gamma Rays from 1ES 1440+122

VERITAS Collaboration, S. Archambault, A. Archer, A. Barnacka, B. Behera, M. Beilicke, W. Benbow, K. Berger, R. Bird, M. Boettcher, J. H. Buckley, V. Bugaev, J.… 展开作者

VERITAS Collaboration, S. Archambault, A. Archer, A. Barnacka, B. Behera, M. Beilicke, W. Benbow, K. Berger, R. Bird, M. Boettcher, J. H. Buckley, V. Bugaev, J. V Cardenzana, M. Cerruti, X. Chen, J. L. Christiansen, L. Ciupik, E. Collins-Hughes, M. P. Connolly, W. Cui, H. J. Dickinson, J. Dumm, J. D. Eisch, M. Errando, A. Falcone, S. Federici, Q. Feng, J. P. Finley, H. Fleischhack, L. Fortson, A. Furniss, G. H. Gillanders, S. Godambe, S. Griffin, S. T. Griffiths, J. Grube, G. Gyuk, N. Haakansson, D. Hanna, J. Holder, G. Hughes, C. A. Johnson, P. Kaaret, P. Kar, M. Kertzman, Y. Khassen, D. Kieda, H. Krawczynski, S. Kumar, M. J. Lang, A. S Madhavan, G. Maier, S. McArthur, A. McCann, K. Meagher, J. Millis, P. Moriarty, T. Nelson, D. Nieto, A. O'Faolain de Bhroithe, R. A. Ong, A. N. Otte, N. Park, J. S. Perkins, M. Pohl, A. Popkow, H. Prokoph, E. Pueschel, J. Quinn, K. Ragan, J. Rajotte, L. C. Reyes, P. T. Reynolds, G. T. Richards, E. Roache, G. H. Sembroski, K. Shahinyan, A. W. Smith, D. Staszak, K Sweeney, I. Telezhinsky, J. V. Tucci, J. Tyler, A. Varlotta, V. V. Vassiliev, S. P. Wakely, R. Welsing, A. Wilhelm, D. A. Williams, B. Zitzer

摘要:

BL Lacertae天体1 ES 1440+122由VERITAS成像大气切伦科夫望远镜阵列在85 GeV至30 TeV的能量范围内观测。这些观测在2008年5月至2010年6月之间进行,总共53小时,结果发现了来自耀变体的$γ$射线发射,其红移$z$ =0.163。1 ES 1440+122的检测结果具有统计学显著性,比背景高5.5个标准差,200 GeV以上的积分通量为(2.8 $\pm0.7_{\mathrm{stat}}\pm0.8_{\mathrm{sys}}$)$\times$ 10 $^{-12}$ cm $^{-2}$ s $^{-1}$(蟹状星云通量的1.2%)。测量的光谱是很好地描述了从0.2 TeV到1.3 TeV的幂律与光子指数为3.1 $\pm$ 0.4 $_{\mathrm{stat}}$ $\pm$ 0.2 $_{\mathrm{sys}}$。费米大面积望远镜(0.3- 300 GeV)和Swift X射线望远镜(0.2- 10 keV)的准同时多波长数据也被用来模拟发射区的性质。一个同步自康普顿模型产生一个很好的代表性的多波长数据。加入一个外康普顿或强子成分也能充分描述数据。

英文摘要:

The BL Lacertae object 1ES 1440+122 was observed in the energy range from 85 GeV to 30 TeV by the VERITAS array of imaging atmospheric Cherenkov telescopes. The observations, taken between 2008 May and 2010 June and totalling 53 hours, resulted in the discovery of $γ$-ray emission from the blazar, which has a redshift $z$=0.163. 1ES 1440+122 is detected at a statistical significance of 5.5 standard deviations above the background with an integral flux of (2.8$\pm0.7_{\mathrm{stat}}\pm0.8_{\mathrm{sys}}$) $\times$ 10$^{-12}$ cm$^{-2}$ s$^{-1}$ (1.2\% of the Crab Nebula's flux) above 200 GeV. The measured spectrum is described well by a power law from 0.2 TeV to 1.3 TeV with a photon index of 3.1 $\pm$ 0.4$_{\mathrm{stat}}$ $\pm$ 0.2$_{\mathrm{sys}}$. Quasi-simultaneous multi-wavelength data from the Fermi Large Area Telescope (0.3--300 GeV) and the Swift X-ray Telescope (0.2--10 keV) are additionally used to model the properties of the emission region. A synchrotron self-Compton model produces a good representation of the multi-wavelength data. Adding an external-Compton or a hadronic component also adequately describes the data.

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