The simple leaky-box model of propagation of cosmic rays in the Galaxy is quite suitable for handling data on cosmic ray nuclei energy spectra and composition at E ? 1 GeV [1,2]. In the leakybox model a full information about cosmic ray propagation in Galaxy is compressed to the single parameter - escape length, Xe, characterizing mean grams of a matter passed by cosmic rays from sources to the Earth. In this paper we analyze the world data on proton and iron cosmic ray spectra collected in the past (HEAO, CRN et al.) and in series of recent electronic experiments (ATIC, CREAM, MS, BESS, Tracer et al.) and obtain the rigidity dependence of escape length, Xe(R) = R^(-0.47\pm-0.03), from the measured rigidity dependence of the protons/iron ratio. It quite agrees with the one stimated in standard manner from the secondary/primary nuclei ratio. But at R > 300 GV the behavior of Xe(R)distinctly changes, that can (variant of explanation)point out to the change of proton/iron ratio in cosmic ray sources.
Interaction between Molecular Clouds and MeV-TeV Cosmic-ray Protons Escaped from Supernova Remnants
最近在几个超新星遗迹(SNRs)周围发现的X射线中性铁线(Fe I Kα,6.40 keV)表明,MeV宇宙线(CR)质子分布在SNRs周围,并与那里的中性气体发生相互作用。我们建议,这些兆电子伏的CR是那些已被加速的SNR与GeV-TeV的CR。在我们的分析模型中,当SNR与分子云碰撞时,MeV的CR仍然被限制在SNR中。碰撞后,MeV的CRs泄漏到云中,产生中性铁线辐射。另一方面,GeV-TeV的CR已经从SNRs中逃逸出来,并通过与SNRs周围的分子云相互作用发射伽马射线。我们将这个模型应用于信噪比W28和W 44,并表明它可以重现铁线强度和γ射线谱的观测。这可能是另一个支持的强子方案的伽马射线发射从这些SNR。
Narrow iron- and nickel-K absorption lines from the eclipsing low-mass X-ray binary AX~J1745.6$-$2901
Tokyo Metropolitan University(东京都立大学);Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)(宇宙科学研究所(ISAS),日本宇宙航空研究开发机构(JAXA));Osaka University(大阪大学);University of Michigan(密歇根大学);ESO(欧洲南方天文台);Centre for Extragalactic Astronomy, Department of Physics, University of Durham(杜伦大学物理系河外天文中心);Saitama University(埼玉大学)
A Comparison of the Galactic Cosmic Ray Electron and Proton Intensities From 1 MeV/nuc to 1 TeV/nuc Using Voyager and Higher Energy Magnetic Spectrometer Measurements Are There Differences in the Source Spectra of These Particles?
X-ray spectroscopy in the microcalorimeter era III: line formation under Case A, Case B, Case C, and Case D in H- and He-like iron for a photoionized cloud
X-ray spectroscopy in the microcalorimeter era I: Effects of Fe XXIV Resonance Auger Destruction on Fe XXV K$α$ spectra
我们讨论了在光学厚云中Fe $^{23+}$在确定Fe XXV K $α$络合物谱线强度中的重要性,并研究了Liedahl(2005)对有云共振俄歇破坏(RAD)的预测。虽然最初的动机英仙座集群,我们的计算扩展到广泛的列密度在天文学中遇到的。Fe XXV线光子在被三电子铁吸收后可以改变/失去其身份,这是“线联锁”的结果。这可能导致吸收离子的自电离,最终通过RAD破坏Fe XXV K $α$光子。在Fe XXV K $α$络合物中的四个成员中,显著部分的x线光子被Fe $^{23+}$吸收并被破坏,导致x线强度降低。例如,在10 $^{25}$ cm $^{-2}$的氢柱密度下,$\sim$ 32%的x光子由于RAD而被破坏,而w几乎不受影响。y的线强度略有降低($\leq$ 2\%)。z不直接受RAD影响,但是z和x线强度之间的对比行为指向x光子的微小部分($\sim$ 2\%)到z光子的可能转换。本文还讨论了快热电子散射逃逸(ESE)引起的谱线强度的变化。