We present the first comprehensive analysis of the argon K-edge absorption region (3.1-4.2 Å) using high-resolution HETGS {\it Chandra} spectra of 33 low-mas X-ray binaries. Utilizing R-matrix theory, we computed new K photoabsorption cross-sections for {\rm Ar}~{\sc i}--{\rm Ar}~{\sc xvi} species. For each X-ray source, we estimated column densities for the {\rm Ar}~{\sc i}, {\rm Ar}~{\sc ii}, {\rm Ar}~{\sc iii}, {\rm Ar}~{\sc xvi}, {\rm Ar}~{\sc xvii} and {\rm Ar}~{\sc xviii} ions, which trace the neutral, warm and hot components of the gaseous Galactic interstellar medium. We examined their distribution as a function of Galactic latitude, longitude, and distances to the sources. However, no significant correlations were discerned among distances, Galactic latitude, or longitude. Future X-ray observatories will allow us to benchmark the atomic data as the main resonance lines will be resolved.
XRISM spectroscopy of a crowded Galactic center region -- III. S, Ar and Ca ISM Absorption Features in the spectrum of MAXI J1744-294
Max-Planck-Institut für extraterrestrische Physik(马克斯·普朗克地外物理研究所);Ehime University(爱媛大学);Hasan Kalyoncu University(哈桑·卡伦库大学);Western Michigan University(西密歇根大学);Columbia Astrophysics Laboratory, Columbia University(哥伦比亚大学天体物理学实验室);Kyoto University(京都大学);Shizuoka University(静冈大学);Nara University of Education(奈良教育大学)
Carbon X-ray absorption in the local ISM: fingerprints in X-ray Novae spectra
我们提出了一个研究的C K-边缘使用高分辨率LETGS钱德拉光谱的四个新星在其超软源(SSS)阶段。我们确定了C~ii K $α$,C~iii K $α$和C~ iii K $β$共振的吸收线。我们使用这些天文观测来对原子数据进行基准测试,其中涉及共振和光电离截面的波长偏移。我们用改进的原子数据估计了C~ii和C~iii柱密度。吸收线的物理位移的情况下,多个观测和SSS新星大气建模所需的高温之间的柱密度的一致性支持我们的结论ISM起源的各自的吸收线。假设碰撞电离平衡等离子体,由吸收体C~ii/C~iii柱密度比导出的最高温度对应于$T_{max}< 3.05\times10^{4}$ K。
Nitrogen is one of the most abundant metals in the interstellar medium (ISM), and thus it constitutes an excellent test to study a variety of astrophysical environments, ranging from nova to active galactic nuclei. We present a detailed analysis of the gaseous component of the N K~edge using high-resolution { \it XMM-Newton} spectra of 12 Galactic and 40 extragalactic sources. For each source, we have estimated column densities for { \rm N}~{ \sc i}, { \rm N}~{ \sc ii}, { \rm N}~{ \sc iii}, { \rm N}~{ \sc v}, { \rm N}~{ \sc vi} and { \rm N}~{ \sc vii} ionic species, which trace the cold, warm …
Ne and Fe abundances in the ISM: Archival Study of Fe-L and Ne-K edges in Chandra and XMM-Newton
University of Michigan(密歇根大学);European Space Agency, European Space Research and Technology Center(欧洲空间局,欧洲空间研究与技术中心);Rochester Institute of Technology(罗切斯特理工学院)
Dust grain chemistry in the diffuse ISM towards the black hole transient GX 339-4
MIT Kavli Institute for Astrophysics and Space Research(麻省理工学院卡弗里天体物理学与空间研究所);European Space Agency (ESA)(欧洲空间局);European Research and Technology Centre (ESTEC)(欧洲研究与技术中心);SRON Space Research Organisation Netherlands(荷兰空间研究组织);University of Michigan(密歇根大学);Anton Pannekoek Institute, University of Amsterdam(阿姆斯特丹大学安东·潘内科克研究所);X-ray Astrophysics Laboratory, NASA Goddard Space Flight Center(NASA戈达德太空飞行中心X射线天体物理实验室);Cahill Center for Astrophysics, California Institute of Technology(加州理工学院凯尔天体物理中心);Max-Planck-Institut für extraterrestrische Physik(马克斯·普朗克地外物理研究所);Center for Astrophysics — Harvard & Smithsonian(哈佛-史密森尼天体物理中心);Scuola Universitaria Superiore IUSS Pavia(帕维亚高等大学学院);Space Telescope Science Institute(太空望远镜科学研究所)
Searching for the warm-hot intergalactic medium using XMM-Newton high-resolution X-ray spectra
局域宇宙中重子的缺失问题仍然是一个悬而未决的问题。另一种建议是,在低红移时,失踪的重子是以温暖的热星系际介质(WHIM)的形式存在。为了验证这一观点,我们对Mrk 421、1 ES 1028+511、1 ES 1553+113、H2356-309、PKS 0558-504和PG 1116+215等6个河外源的X射线高分辨谱进行了详细的分析,并对它们的X射线谱进行了比较。利用XMM-牛顿反射光栅光谱仪获得的X射线谱图来搜索WHIM和/或环星系介质(CGM)X射线吸收气体的信号。我们用IONeq模型拟合X射线吸收,使我们能够考虑到由于局部ISM的多相分量而存在的X射线光谱特征。包括一个额外的IONeq组件来模拟WHIM吸收,而不是传统的高斯吸收线建模。当在任何源中包括这样的分量时,我们没有发现拟合的统计改进,得出的结论是,我们可以安全地拒绝对这些视线的WHIM吸收体的成功检测。我们的模拟表明,多相ISM吸收特征的存在阻止了使用高分辨率光谱进行中等曝光时在17 A光谱区域中检测到低红移WHIM吸收特征。