降低 IceCube 在南天点源搜索中的能量阈值
高能天体物理现象
2016-06-28 v2
摘要
观测到天体物理中微子的点源将是宇宙线加速器的“确凿”特征。尽管 IceCube 最近发现了天体物理中微子的弥漫流，但尚未观测到局域化的点源。先前 IceCube 在南天搜索点源受限于高于几百 TeV 的能量阈值或较差的中微子角分辨率。在此我们提出一种对能量低于 100 TeV 的中微子灵敏度大幅提高的南天点源搜索。通过选取在探测器内部发生相互作用的带电流 ，我们降低了大气背景，同时保留了以亚度角分辨率重建的天体物理中微子诱发事件的效率。新事件样本覆盖了三年的探测器数据，并使南天发射低于 100 TeV 的点源的灵敏度提高了十倍。未发现具有统计显著性的点源证据，并对来自单个源的中微子发射设定了上限。对样本中最高能量约 100 TeV 的起始事件的后验分析发现，仅该事件就代表了与数据仅由大气背景组成的假设之间的 偏差。
引用
@article{arxiv.1605.00163,
title = {Lowering IceCube's Energy Threshold for Point Source Searches in the Southern Sky},
author = {IceCube Collaboration and M. G. Aartsen and K. Abraham and M. Ackermann and J. Adams and J. A. Aguilar and M. Ahlers and M. Ahrens and D. Altmann and K. Andeen and T. Anderson and I. Ansseau and G. Anton and M. Archinger and C. Arguelles and T. C. Arlen and J. Auffenberg and S. Axani and X. Bai and S. W. Barwick and V. Baum and R. Bay and J. J. Beatty and J. Becker Tjus and K. -H. Becker and S. BenZvi and P. Berghaus and D. Berley and E. Bernardini and A. Bernhard and D. Z. Besson and G. Binder and D. Bindig and M. Bissok and E. Blaufuss and S. Blot and D. J. Boersma and C. Bohm and M. Börner and F. Bos and D. Bose and S. Böser and O. Botner and J. Braun and L. Brayeur and H. -P. Bretz and A. Burgman and N. Buzinsky and J. Casey and M. Casier and E. Cheung and D. Chirkin and A. Christov and K. Clark and L. Classen and S. Coenders and G. H. Collin and J. M. Conrad and D. F. Cowen and A. H. Cruz Silva and J. Daughhetee and J. C. Davis and M. Day and J. P. A. M. de André and C. De Clercq and E. del Pino Rosendo and H. Dembinski and S. De Ridder and P. Desiati and K. D. de Vries and G. de Wasseige and M. de With and T. DeYoung and J. C. Díaz-Vélez and V. di Lorenzo and H. Dujmovic and J. P. Dumm and M. Dunkman and B. Eberhardt and T. Ehrhardt and B. Eichmann and S. Euler and P. A. Evenson and S. Fahey and A. R. Fazely and J. Feintzeig and J. Felde and K. Filimonov and C. Finley and S. Flis and C. -C. Fösig and T. Fuchs and T. K. Gaisser and R. Gaior and J. Gallagher and L. Gerhardt and K. Ghorbani and L. Gladstone and M. Glagla and T. Glüsenkamp and A. Goldschmidt and G. Golup and J. G. Gonzalez and D. Góra and D. Grant and Z. Griffith and C. Ha and C. Haack and A. Haj Ismail and A. Hallgren and F. Halzen and E. Hansen and B. Hansmann and T. Hansmann and K. Hanson and D. Hebecker and D. Heereman and K. Helbing and R. Hellauer and S. Hickford and J. Hignight and G. C. Hill and K. D. Hoffman and R. Hoffmann and K. Holzapfel and A. Homeier and K. Hoshina and F. Huang and M. Huber and W. Huelsnitz and K. Hultqvist and S. In and A. Ishihara and E. Jacobi and G. S. Japaridze and M. Jeong and K. Jero and B. J. P. Jones and M. Jurkovic and A. Kappes and T. Karg and A. Karle and U. Katz and M. Kauer and A. Keivani and J. L. Kelley and J. Kemp and A. Kheirandish and M. Kim and T. Kintscher and J. Kiryluk and S. R. Klein and G. Kohnen and R. Koirala and H. Kolanoski and R. Konietz and L. Köpke and C. Kopper and S. Kopper and D. J. Koskinen and M. Kowalski and K. Krings and M. Kroll and G. Krückl and C. Krüger and J. Kunnen and S. Kunwar and N. Kurahashi and T. Kuwabara and M. Labare and J. L. Lanfranchi and M. J. Larson and D. Lennarz and M. Lesiak-Bzdak and M. Leuermann and J. Leuner and L. Lu and J. Lünemann and J. Madsen and G. Maggi and K. B. M. Mahn and S. Mancina and M. Mandelartz and R. Maruyama and K. Mase and H. S. Matis and R. Maunu and F. McNally and K. Meagher and M. Medici and M. Meier and A. Meli and T. Menne and G. Merino and T. Meures and S. Miarecki and E. Middell and L. Mohrmann and T. Montaruli and M. Moulai and R. Nahnhauer and U. Naumann and G. Neer and H. Niederhausen and S. C. Nowicki and D. R. Nygren and A. Obertacke Pollmann and A. Olivas and A. Omairat and A. O'Murchadha and T. Palczewski and H. Pandya and D. V. Pankova and Ö. Penek and J. A. Pepper and C. Pérez de los Heros and C. Pfendner and D. Pieloth and E. Pinat and J. Posselt and P. B. Price and G. T. Przybylski and M. Quinnan and C. Raab and L. Rädel and M. Rameez and K. Rawlins and R. Reimann and M. Relich and E. Resconi and W. Rhode and M. Richman and B. Riedel and S. Robertson and M. Rongen and C. Rott and T. Ruhe and D. Ryckbosch and D. Rysewyk and L. Sabbatini and A. Sandrock and J. Sandroos and S. Sarkar and K. Satalecka and M. Schimp and P. Schlunder and T. Schmidt and S. Schoenen and S. Schöneberg and A. Schönwald and L. Schumacher and D. Seckel and S. Seunarine and D. Soldin and M. Song and G. M. Spiczak and C. Spiering and M. Stahlberg and M. Stamatikos and T. Stanev and A. Stasik and A. Steuer and T. Stezelberger and R. G. Stokstad and A. Stößl and R. Ström and N. L. Strotjohann and G. W. Sullivan and M. Sutherland and H. Taavola and I. Taboada and J. Tatar and S. Ter-Antonyan and A. Terliuk and G. Tešić and S. Tilav and P. A. Toale and M. N. Tobin and S. Toscano and D. Tosi and M. Tselengidou and A. Turcati and E. Unger and M. Usner and S. Vallecorsa and J. Vandenbroucke and N. van Eijndhoven and S. Vanheule and M. van Rossem and J. van Santen and J. Veenkamp and M. Vehring and M. Voge and M. Vraeghe and C. Walck and A. Wallace and M. Wallraff and N. Wandkowsky and Ch. Weaver and C. Wendt and S. Westerhoff and B. J. Whelan and N. Whitehorn and S. Wickmann and K. Wiebe and C. H. Wiebusch and L. Wille and D. R. Williams and L. Wills and H. Wissing and M. Wolf and T. R. Wood and K. Woschnagg and D. L. Xu and X. W. Xu and Y. Xu and J. P. Yanez and G. Yodh and S. Yoshida and M. Zoll},
journal= {arXiv preprint arXiv:1605.00163},
year = {2016}
}
备注
19 pages, 4 figures