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arXiv 1602.07246astro-ph.HE
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用于费米大天区望远镜数据标准点源分析的银河系星际辐射模型的发展

Development of the Model of Galactic Interstellar Emission for Standard Point-Source Analysis of Fermi Large Area Telescope Data

F. Acero, M. Ackermann, M. Ajello, A. Albert, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, R. Bellazzini, E. Bissaldi, E. D. Bloom, R. Bonino, E. Bottaci… 展开作者

F. Acero, M. Ackermann, M. Ajello, A. Albert, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, R. Bellazzini, E. Bissaldi, E. D. Bloom, R. Bonino, E. Bottacini, T. J. Brandt, J. Bregeon, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, M. Caragiulo, P. A. Caraveo, J. M. Casandjian, E. Cavazzuti, C. Cecchi, E. Charles, A. Chekhtman, J. Chiang, G. Chiaro, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, A. Cuoco, S. Cutini, F. D'Ammando, A. de Angelis, F. de Palma, R. Desiante, S. W. Digel, L. Di Venere, P. S. Drell, C. Favuzzi, S. J. Fegan, E. C. Ferrara, W. B. Focke, A. Franckowiak, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, S. Guiriec, D. Hadasch, A. K. Harding, K. Hayashi, E. Hays, J. W. Hewitt, A. B. Hill, D. Horan, X. Hou, T. Jogler, G. Jóhannesson, T. Kamae, M. Kuss, D. Landriu, S. Larsson, L. Latronico, J. Li, L. Li, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, S. Maldera, D. Malyshev, A. Manfreda, P. Martin, M. Mayer, M. N. Mazziotta, J. E. McEnery, P. F. Michelson, N. Mirabal, T. Mizuno, M. E. Monzani, A. Morselli, E. Nuss, T. Ohsugi, N. Omodei, M. Orienti, E. Orlando, J. F. Ormes, D. Paneque, M. Pesce-Rollins, F. Piron, G. Pivato, S. Rainò, R. Rando, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, Q. Remy, N. Renault, M. Sánchez-Conde, M. Schaal, A. Schulz, C. Sgrò, E. J. Siskind, F. Spada, G. Spandre, P. Spinelli, A. W. Strong, D. J. Suson, H. Tajima, H. Takahashi, J. B. Thayer, D. J. Thompson, L. Tibaldo, M. Tinivella, D. F. Torres, G. Tosti, E. Troja, G. Vianello, M. Werner, K. S. Wood, M. Wood, G. Zaharijas, S. Zimmer

摘要:

费米伽马射线太空望远镜上的大面积望远镜(LAT)探测到的大多数天体伽马射线都来自于高能宇宙射线与星际核子和光子相互作用时的星际介质。传统的点源和扩展源研究依赖于这种漫发射的建模,以获得准确的表征。我们在这里描述的银河系星际发射模型(GIEM)的发展,这是LAT合作所采用的标准,是公开的。该模型是基于一个线性组合的地图星际气体柱密度在银河系的环和逆康普顿排放在银河系中产生的。我们还包括在GIEM大尺度结构,如环I和费米泡。测量的气体发射率光谱证实,宇宙射线质子密度的银心距离超过5千秒差距,从银河系中心减少。测量结果还表明,随着银河系的距离,质子光谱变软。我们观察到,费米气泡的边界形状类似于一个悬链线在纬度低于20度,我们观察到一个增强的发射向他们的基地延伸在北银河系和南银河系的方向,位于银河系中心的4度。

英文摘要:

Most of the celestial gamma rays detected by the Large Area Telescope (LAT) aboard the Fermi Gamma-ray Space Telescope originate from the interstellar medium when energetic cosmic rays interact with interstellar nucleons and photons. Conventional point and extended source studies rely on the modeling of this diffuse emission for accurate characterization. We describe here the development of the Galactic Interstellar Emission Model (GIEM) that is the standard adopted by the LAT Collaboration and is publicly available. The model is based on a linear combination of maps for interstellar gas column density in Galactocentric annuli and for the inverse Compton emission produced in the Galaxy. We also include in the GIEM large-scale structures like Loop I and the Fermi bubbles. The measured gas emissivity spectra confirm that the cosmic-ray proton density decreases with Galactocentric distance beyond 5 kpc from the Galactic Center. The measurements also suggest a softening of the proton spectrum with Galactocentric distance. We observe that the Fermi bubbles have boundaries with a shape similar to a catenary at latitudes below 20 degrees and we observe an enhanced emission toward their base extending in the North and South Galactic direction and located within 4 degrees of the Galactic Center.

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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