SPECTRUM OF RELATIVISTIC AND SUBRELATIVISTIC COSMIC RAYS IN THE 100 pc CENTRAL REGION

被引：18

作者：

Dogiel, V. A. ^{[1
,2
,3
,4
,8
]}

Chernyshov, D. O. ^{[1
,2
]}

Kiselev, A. M. ^{[1
]}

Nobukawa, M. ^{[5
,6
]}

Cheng, K. S. ^{[2
]}

Hui, C. Y. ^{[7
]}

Ko, C. M. ^{[3
,4
]}

Nobukawa, K. K. ^{[5
]}

Tsuru, T. G. ^{[5
]}

机构：

[1] PN Lebedev Phys Inst, IE Tamm Theoret Phys Div, Moscow 119991, Russia

[2] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China

[3] Natl Cent Univ, Dept Phys, Inst Astron, Jhongli, Taiwan

[4] Natl Cent Univ, Ctr Complex Syst, Jhongli, Taiwan

[5] Kyoto Univ, Grad Sch Sci, Dept Phys, Sakyo Ku, Kyoto 6068502, Japan

[6] Kyoto Univ, Hakubi Ctr Adv Res, Kyoto 6068302, Japan

[7] Chungnam Natl Univ, Dept Astron & Space Sci, Daejeon, South Korea

[8] Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Region, Russia

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 809卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

cosmic rays; Galaxy: center; ISM: clouds; X-rays: ISM; 6.4 KEV LINE; GALACTIC GAMMA-RAYS; HIGH-ENERGY; MOLECULAR CLOUDS; MAGNETIC-FIELDS; INTERSTELLAR CLOUDS; RADIAL-DISTRIBUTION; CROSS-SECTIONS; STAR-FORMATION; SOLAR CIRCLE;

D O I：

10.1088/0004-637X/809/1/48

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

From the rate of hydrogen ionization and the gamma-ray flux, we derived the spectrum of relativistic and subrelativistic cosmic rays (CRs) nearby and inside the molecular cloud Sgr B2 near the Galactic Center. We studied two cases of CR propagation in molecular clouds: free propagation and scattering of particles by magnetic fluctuations excited by the neutral gas turbulence. We showed that in the latter case CR propagation inside the cloud can be described as diffusion with a coefficient of similar to 3 x 10(27) cm(2) s(-1). For the case of hydrogen ionization by subrelativistic protons, we showed that their spectrum outside the cloud is quite hard with a spectral index of delta > -1. The energy density of subrelativistic protons (>50 eV cm(-3)) is one order of magnitude higher than that of relativistic CRs. These protons generate the 6.4 keV emission from Sgr B2, which was about 30% of the flux observed by Suzaku in 2013. Future observations for the period after 2013 may discover the background flux generated by subrelativistic CRs in Sgr B2. Alternatively, hydrogen ionization of the molecular gas in Sgr B2 may be caused by high energy electrons. We showed that the spectrum of electron bremsstrahlung is harder than the observed continuum from Sgr B2, and in principle, this X-ray component provided by electrons could be seen from the INTEGRAL data as a stationary high energy excess above the observed spectrum E-x(-2).

引用

页数：12

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