Planck 中期结果 IX：利用 Planck 探测银河系晕
星系天体物理
2015-06-11 v1 宇宙学与河外天体物理
高能天体物理现象
摘要
利用 Planck 卫星的高精度全天观测数据，并应用多种成分分离方法，我们识别并表征了微波波段的银河系“晕”辐射。该晕是弥漫银河系辐射的一个独特成分，大致以银河系中心为中心，在银河纬度上延伸至 |b| ~35 度，在经度上延伸至 |l| ~15 度。通过结合 Planck 数据与 WMAP 观测结果，我们能够以高精度确定该辐射的能谱，且不受先前分析中存在的大型系统偏差的影响。推导出的能谱与谱指数为 -2.55 +/- 0.05 的幂律辐射一致，从而排除了自由 - 自由辐射作为其来源，转而支持来自电子种群（数密度随能量分布为 dN/dE ~ E^-2.1）的硬谱同步辐射。在银河纬度 |b|<30 度的范围内，微波晕的形态与 Fermi 伽马射线“晕”或“气泡”一致，表明我们对银河系这一独特成分拥有了多波段视图。鉴于该辐射具有极硬的能谱和延展性质，晕电子源于银河系盘内超新星激波的可能性极低。相反，这暗示了银河系中心存在一种新的宇宙线加速机制。
引用
@article{arxiv.1208.5483,
title = {Planck Intermediate Results. IX. Detection of the Galactic haze with Planck},
author = {Planck Collaboration and P. A. R. Ade and N. Aghanim and M. Arnaud and M. Ashdown and F. Atrio-Barandela and J. Aumont and C. Baccigalupi and A. Balbi and A. J. Banday and R. B. Barreiro and J. G. Bartlett and E. Battaner and K. Benabed and A. Benoît and J. -P. Bernard and M. Bersanelli and A. Bonaldi and J. R. Bond and J. Borrill and F. R. Bouchet and C. Burigana and P. Cabella and J. -F. Cardoso and A. Catalano and L. Cayón and R. -R. Chary and L. -Y Chiang and P. R. Christensen and D. L. Clements and L. P. L. Colombo and A. Coulais and B. P. Crill and F. Cuttaia and L. Danese and O. D'Arcangelo and R. J. Davis and P. de Bernardis and G. de Gasperis and A. de Rosa and G. de Zotti and J. Delabrouille and C. Dickinson and J. M. Diego and G. Dobler and H. Dole and S. Donzelli and O. Doré and U. Dörl and M. Douspis and X. Dupac and G. Efstathiou and T. A. Enßlin and H. K. Eriksen and F. Finelli and O. Forni and M. Frailis and E. Franceschi and S. Galeotta and K. Ganga and M. Giard and G. Giardino and J. González-Nuevo and K. M. Górski and S. Gratton and A. Gregorio and A. Gruppuso and F. K. Hansen and D. Harrison and G. Helou and S. Henrot-Versillé and C. Hernández-Monteagudo and S. R. Hildebrandt and E. Hivon and M. Hobson and W. A. Holmes and A. Hornstrup and W. Hovest and K. M. Huffenberger and T. R. Jaffe and T. Jagemann and W. C. Jones and M. Juvela and E. Keihänen and J. Knoche and L. Knox and M. Kunz and H. Kurki-Suonio and G. Lagache and A. Lähteenmäki and J. -M. Lamarre and A. Lasenby and C. R. Lawrence and S. Leach and R. Leonardi and P. B. Lilje and M. Linden-Vørnle and M. López-Caniego and P. M. Lubin and J. F. Macías-Pérez and B. Maffei and D. Maino and N. Mandolesi and M. Maris and P. G. Martin and E. Martínez-González and S. Masi and M. Massardi and S. Matarrese and F. Matthai and P. Mazzotta and P. R. Meinhold and A. Melchiorri and L. Mendes and A. Mennella and S. Mitra and M. -A. Miville-Deschênes and A. Moneti and L. Montier and G. Morgante and D. Munshi and J. A. Murphy and P. Naselsky and P. Natoli and H. U. Nørgaard-Nielsen and F. Noviello and S. Osborne and F. Pajot and R. Paladini and D. Paoletti and B. Partridge and T. J. Pearson and O. Perdereau and F. Perrotta and F. Piacentini and M. Piat and E. Pierpaoli and D. Pietrobon and S. Plaszczynski and E. Pointecouteau and G. Polenta and N. Ponthieu and L. Popa and T. Poutanen and G. W. Pratt and S. Prunet and J. -L. Puget and J. P. Rachen and R. Rebolo and M. Reinecke and C. Renault and S. Ricciardi and T. Riller and G. Rocha and C. Rosset and J. A. Rubiño-Martín and B. Rusholme and M. Sandri and G. Savini and B. M. Schaefer and D. Scott and G. F. Smoot and F. Stivoli and R. Sudiwala and A. -S. Suur-Uski and J. -F. Sygnet and J. A. Tauber and L. Terenzi and L. Toffolatti and M. Tomasi and M. Tristram and M. Türler and G. Umana and L. Valenziano and B. Van Tent and P. Vielva and F. Villa and N. Vittorio and L. A. Wade and B. D. Wandelt and M. White and D. Yvon and A. Zacchei and A. Zonca},
journal= {arXiv preprint arXiv:1208.5483},
year = {2015}
}
备注
15 pages, 9 figures, submitted to Astronomy and Astrophysics