X-ray spectral analysis of the low-luminosity active galactic nucleus NGC 7213 using long XMM-Newton observations

被引：13
|
作者：
Emmanoulopoulos, D. [1 ]
Papadakis, I. E. [2 ,3 ]
Nicastro, F. [3 ,4 ]
McHardy, I. M. [1 ]
机构：
[1] Univ Southampton, Southampton SO17 1BJ, Hants, England
[2] Univ Crete, Dept Phys, Iraklion 71003, Greece
[3] Fdn Res & Technol, IESL, Iraklion 71110, Greece
[4] INAF Osservatorio Astron Roma, I-00040 Monte Porzio Catone, Italy
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2013年 / 429卷 / 04期
基金：
英国科学技术设施理事会;
关键词：
line: identification; galaxies: individual: NGC7213; galaxies: nuclei; galaxies: Seyfert; X-rays: galaxies; K-ALPHA LINES; IRON; EMISSION; VARIABILITY; PLASMA; REGION; DIAGNOSTICS; NGC-7213; CHANDRA; ORIGIN;
D O I：
10.1093/mnras/sts610
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the X-ray spectral results from the longest X-ray Multi-mirror Mission-Newton observation, 133 ks, of the low-luminosity active galactic nucleus NGC 7213. The hardness-ratio analysis of the X-ray light curves discloses a rather constant X-ray spectral shape, at least for the observed exposure time, enabling us to perform X-ray spectral studies using the total observed spectrum. Apart from a neutral Fe K alpha emission line, we also detect narrow emission lines from the ionized iron species, Fe XXV and Fe XXVI. Our analysis suggests that the neutral Fe K alpha originates from a Compton-thin reflector, while the gas responsible for the high-ionization lines is collisionally excited. The overall spectrum, in the 0.3-10 keV energy band, registered by the European Photon Imaging Camera can be modelled by a power-law component (with a slope of Gamma similar or equal to 1.9) plus two thermal components at 0.36 and 8.84 keV. The low-energy thermal component is entirely consistent with the X-ray spectral data obtained by the Reflection Grating Spectrometer between 0.35-1.8 keV.
引用
收藏
页码：3439 / 3448
页数：10
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