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arXiv 1709.01708astro-ph.GA
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从NuSTAR看ULIRG IRAS F00183-7111的活性核

The active nucleus of the ULIRG IRAS F00183-7111 viewed by NuSTAR

K. Iwasawa, H. W. W. Spoon, A. Comastri, R. Gilli, G. Lanzuisi, E. Piconcelli, C. Vignali, M. Brusa, S. Puccetti

摘要:

利用NuSTAR、Chandra X射线天文台、朱雀和XMM-牛顿的观测数据,对超亮红外星系IRAS F00183-7111(z=0.327)进行了X射线研究。钱德拉成像显示,一个点状X射线源位于星系核,能量超过2 keV。然而,在较低的能量,点源解析为扩散发射,延伸到东部,在那里的nuclear [O III]发射,推测引起的银河系规模的流出,是存在的。核源由NuSTAR检测到,最高可达30 keV的静止帧。强,高电离铁K线,首先看到的XMM-牛顿,随后由朱雀和钱德拉,是没有检测到的NuSTAR数据。在2003年至2016年期间,线通量似乎一直在持续下降,而连续辐射则稳定在30%以内。低于10 keV的X射线连续谱的特征在于由nH ~ 1 e ~(23)cm ~(-2)的冷吸收引起的硬光谱,与9.7微米处的硅酸盐吸收兼容,以及约8 keV的宽吸收特征,我们将其归因于高电离Fe K吸收边。后者最好用蓝移的高电离(log xi ~3)吸收体来描述。在NuSTAR的数据中没有看到康普顿厚源产生的额外硬分量。虽然一个纯反射的情况下(与一个完全隐藏的中心源)是可行的,直接发射的L(2-10 keV)= 2 e44 erg/s的中心源,后面层的冷和热的吸收气体可能是一个替代的解释。在这种情况下,相对的X射线宁静度(Lx/L_AGN ~ 6 e-3),高电离Fe线,从各种观测推断的强流出,以及其他与已被充分研究的ULIRG/类星体Mrk 231的相似之处,表明该ULIRG的中心源可能在爱丁顿极限附近吸积。

英文摘要:

We present an X-ray study of the ultra-luminous infrared galaxy IRAS F00183-7111 (z=0.327), using data obtained from NuSTAR, Chandra X-ray Observatory, Suzaku and XMM-Newton. The Chandra imaging shows that a point-like X-ray source is located at the nucleus of the galaxy at energies above 2 keV. However, the point source resolves into diffuse emission at lower energies, extending to the east, where the extranuclear [O III] emission, presumably induced by a galactic-scale outflow, is present. The nuclear source is detected by NuSTAR up to the rest-frame 30 keV. The strong, high-ionization Fe K line, first seen by XMM-Newton, and subsequently by Suzaku and Chandra, is not detected in the NuSTAR data. The line flux appears to have been declining continuously between 2003 and 2016, while the continuum emission remained stable to within 30%. The X-ray continuum below 10 keV is characterised by a hard spectrum caused by cold absorption of nH ~1e23 cm-2, compatible to that of the silicate absorption at 9.7 micron, and a broad absorption feature around 8 keV which we attribute to a high-ionization Fe K absorption edge. The latter is best described by a blueshifted, high-ionization (log xi ~3) absorber. No extra hard component, which would arise from a Compton-thick source, is seen in the NuSTAR data. While a pure reflection scenario (with a totally hidden central source) is viable, direct emission from the central source of L(2-10 keV) = 2e44 erg/s, behind layers of cold and hot absorbing gas may be an alternative explanation. In this case, the relative X-ray quietness (Lx/L_AGN ~6e-3), the high-ionization Fe line, strong outflows inferred from various observations, and other similarities to the well-studied ULIRG/QSO Mrk 231 point that the central source in this ULIRG might be accreting close to the Eddington limit.

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