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arXiv 0911.3153astro-ph.HE
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Seyfert 1 Mrk841的高分辨率X射线光谱学:对热吸收体和热发射体的认识

High resolution X-ray spectroscopy of the Seyfert 1 Mrk841: insights into the warm absorber and warm emitter

A. L. Longinotti, E. Costantini, P. O. Petrucci, C. Boisson, M. Mouchet, M. Santos-Lleo, G. Matt, G. Ponti, A. C. Goncalves

摘要:

在2001年至2005年期间,XMM-牛顿X射线天文台对塞弗特1星系Mrk 841进行了五次观测。该源是众所周知的,显示光谱的复杂性,在可变的铁线和软X射线过剩。本文首次报道了Mrk 841软X射线谱的高分辨研究。反射光栅光谱仪(RGS)相机获得的多次曝光的可用性允许在软X射线band.的复杂的吸收和发射光谱特征的深入研究的三个组合曝光获得在2001年1月和两个获得在2005年1月和7月使用DAC软件进行了分析。我们检测到一个两相的热吸收体:一个中等电离分量(logxi~1.5-2.2 ergs s cm^{-1})负责Fe M壳层的未分辨跃迁阵列中的深吸收特征和OVI-VIII带中的几条吸收线;一个更高的电离相位(logxi~3 ergs cm^{-1})需要拟合NeIX-X带中的吸收。电离状态和柱密度的气体呈现温和的变化,从2001年到2005年的两个阶段。热吸收体的高电离分量在Fe K带中没有影响。在RGS数据中没有测量到明显的吸收线速度漂移。值得注意的是,2005年的光谱显示了与高密度(n_e>10^{11} cm^{-3})气体中的光电离一致的发射特征:在2005年1月清楚地观察到一个突出的OVII线三重态,在2005年的两个数据集中都观察到OVII和CVI的窄辐射衰减连续(RRC)。还需要21.7埃左右的宽高斯线来拟合所有数据集。导出的发射线的径向距离似乎表明,光电离发生在光源的光学宽线区域内。

英文摘要:

The Seyfert 1 galaxy Mrk841 was observed five times between 2001 and 2005 by the XMM-Newton X-ray observatory. The source is well known for showing spectral complexity in the variable iron line and in the soft X-ray excess. This paper reports on the first study of Mrk841 soft X-ray spectrum at high spectral resolution. The availability of multiple exposures obtained by the Reflection Grating Spectrometer (RGS) cameras allows a thorough study of the complex absorption and emission spectral features in the soft X-ray band.The three combined exposures obtained in January 2001 and the two obtained in January and July 2005 were analysed using the SPEX software. We detect a two-phase warm absorber: a medium ionisation component (logxi~1.5-2.2 ergs s cm^{-1}) is responsible for a deep absorption feature in the Unresolved Transition Array of the Fe M-shell and for several absorption lines in the OVI-VIII band; a higher ionisation phase with logxi~3 ergs s cm^{-1} is required to fit absorption in the NeIX-X band. The ionisation state and the column density of the gas present moderate variation from 2001 to 2005 for both phases. The high ionisation component of the warm absorber has no effect in the Fe K band. No significant velocity shift of the absorption lines is measured in the RGS data. Remarkably, the 2005 spectra show emission features consistent with photoionisation in a high density (n_e>10^{11} cm^{-3}) gas: a prominent OVII line triplet is clearly observed in January 2005 and narrow Radiative Recombination Continua (RRC) of OVII and CVI are observed in both 2005 data sets. A broad Gaussian line around 21.7 Angstrom is also required to fit all the data sets. The derived radial distance for the emission lines seems to suggest that the photoionisation takes place within the optical Broad Line Region of the source.

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