超新星遗迹IC 443中强子宇宙线加速的直接证据
高能天体物理现象
2015-05-18 v1 星系天体物理
摘要
超新星遗迹（SNR）IC 443是一个中等年龄的遗迹，以其射电、光学、X射线和伽马射线能段发射而闻名。在本快报中，我们研究了AGILE卫星获得的IC 443在100 MeV以上的伽马射线发射。我们在该SNR中探测到了100 MeV-3 GeV能段内明显的弥漫发射图样，其显著极大值（源“A”）位于东北壳层处，在100 MeV以上的通量为 F = (47 \pm 10) 10^{-8} photons cm^{-2} s^{-1}。该位置是SNR激波与致密星周介质之间最强激波相互作用的场所。源“A”与相距0.4度的TeV源不重合，后者与SNR中心区域的致密分子云复合体相关联。根据我们的观测，以及其东北边缘缺乏可探测的弥漫TeV发射，我们证明了电子不能是最强SNR激波处0.1-10 GeV能段伽马射线的主要发射源。最显著伽马射线发射的强度、光谱特征和位置，连同缺乏同空间可探测的TeV发射，仅与SNR中宇宙线加速的强子模型相符。高密度分子云（云“E”）为加速强子的核子相互作用提供了显著的“靶”：我们的结果表明在分子云/激波壳层相互作用位点附近伽马射线产生增强。IC 443提供了SNR加速宇宙线的首个明确证据。
引用
@article{arxiv.1001.5150,
title = {Direct Evidence for Hadronic Cosmic-Ray Acceleration in the Supernova Renmant IC 443},
author = {M. Tavani and A. Giuliani and A. W. Chen and A. Argan and G. Barbiellini and A. Bulgarelli and P. Caraveo and P. W. Cattaneo and V. Cocco and T. Contessi and F. D'Ammando and E. Costa and G. De Paris and E. Del Monte and G. Di Cocco and I. Donnarumma and Y. Evangelista and A. Ferrari and M. Feroci and F. Fuschino and M. Galli and F. Gianotti and C. Labanti and I. Lapshov and F. Lazzarotto and P. Lipari and F. Longo and M. Marisaldi and M. Mastropietro and S. Mereghetti and E. Morelli and E. Moretti and A. Morselli and L. Pacciani and A. Pellizzoni and F. Perotti and G. Piano and P. Picozza and M. Pilia and G. Pucella and M. Prest and M. Rapisarda and A. Rappoldi and E. Scalise and A. Rubini and S. Sabatini and E. Striani and P. Soffitta and M. Trifoglio and A. Trois and E. Vallazza and S. Vercellone and V. Vittorini and A. Zambra and D. Zanello and C. Pittori and F. Verrecchia and P. Santolamazza and P. Giommi and S. Colafrancesco and L. A. Antonelli and L. Salotti},
journal= {arXiv preprint arXiv:1001.5150},
year = {2015}
}
备注
5 pages, 2 figures; accepted by ApJLetters on Jan 21, 2010