THE IMPACT OF ACCURATE EXTINCTION MEASUREMENTS FOR X-RAY SPECTRAL MODELS

被引：31

作者：

Smith, Randall K. ^{[1
]}

Valencic, Lynne A. ^{[2
,3
]}

Corrales, Lia ^{[4
]}

机构：

[1] Smithsonian Astrophys Observ, 60 Garden St, Cambridge, MA 02138 USA

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[3] Johns Hopkins Univ, Dept Phys & Astron, 366 Bloomberg Ctr,3400 N Charles St, Baltimore, MD 21218 USA

[4] MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave,37-241, Cambridge, MA 02139 USA

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 818卷 / 02期

关键词：

dust; extinction; methods: data analysis; X-rays: ISM; INTERSTELLAR DUST GRAINS; XMM-NEWTON; BINARY EXO-0748-676; NEUTRON-STAR; EXO; 0748-676; SCATTERING; HALOS; ASTROPHYSICS; ABSORPTION;

D O I：

10.3847/0004-637X/818/2/143

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Interstellar extinction includes both absorption and scattering of photons from interstellar gas and dust grains, and it has the effect of altering a source's spectrum and its total observed intensity. However, while multiple absorption models exist, there are no useful scattering models in standard X-ray spectrum fitting tools, such as XSPEC. Nonetheless, X-ray halos, created by scattering from dust grains, are detected around even moderately absorbed sources, and the impact on an observed source spectrum can be significant, if modest, compared to direct absorption. By convolving the scattering cross section with dust models, we have created a spectral model as a function of energy, type of dust, and extraction region that can be used with models of direct absorption. This will ensure that the extinction model is consistent and enable direct connections to be made between a source's X-ray spectral fits and its UV/optical extinction.

引用

页数：7

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