Carbon X-ray absorption in the local ISM: Fingerprints in X-ray Novae spectra

被引：13

作者：

Gatuzz, Efrain ^{[1
,2
]}

Ness, J-U ^{[3
]}

Gorczyca, T. W. ^{[4
]}

Hasoglu, M. F. ^{[5
]}

Kallman, Timothy R. ^{[6
]}

Garcia, Javier A. ^{[7
]}

机构：

[1] ESO, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[2] Excellence Cluster Universe, Boltzmannstr 2, D-85748 Garching, Germany

[3] European Space Astron Ctr, XMM Newton Observ SOC, Camino Bajo del Castillo S-N, E-28692 Madrid, Spain

[4] Western Michigan Univ, Kalamazoo, MI 49008 USA

[5] Hasan Kalyoncu Univ, Dept Comp Engn, TR-27100 Sahinbey, Gaziantep, Turkey

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

[7] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 479卷 / 02期

关键词：

ISM: atoms; ISM: structure; X-rays: ISM; HIGH-RESOLUTION SPECTROSCOPY; INTERSTELLAR-MEDIUM; MODEL ATMOSPHERES; V4743; SAGITTARII; FINE-STRUCTURE; GALACTIC HALO; RS-OPHIUCHI; MILKY-WAY; GAS; CHANDRA;

D O I：

10.1093/mnras/sty1517

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a study of the C K-edge using high-resolution LETGS Chandra spectra of four novae during their super-soft-source (SSS) phase. We identified absorption lines due to C II K alpha, C III K alpha, and C III K beta resonances. We used these astronomical observations to perform a benchmarking of the atomic data, which involves wavelength shifts of the resonances and photoionization cross-sections. We used improved atomic data to estimate the C II and C III column densities. The absence of physical shifts for the absorption lines, the consistence of the column densities between multiple observations, and the high temperature required for the SSS nova atmosphere modelling support our conclusion about an interstellar medium origin of the respective absorption lines. Assuming a collisional ionization equilibrium plasma the maximum temperature derived from the ratio of C II/C III column densities of the absorbers correspond to T-max < 3.05 x 10(4) K.

引用

页码：2457 / 2463

页数：7

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