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arXiv 1807.00548astro-ph.HE
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活动星系核-恒星形成星系中一种新的强有力的和高度可变的盘风,MCG-03-58-007的情况

A new powerful and highly variable disk wind in an AGN-star forming galaxy, the case of MCG-03-58-007

V. Braito, J. N. Reeves, G. A. Matzeu, P. Severgnini, L. Ballo, A. Caccianiga, S. Campana, C. Cicone, R. Della Ceca, T. J. Turner

摘要:

我们提出了一个新的候选人的快速盘风的发现,在附近的塞弗特2星系MCG-03-58-007。这种风是在2010年进行的一次深朱雀观测中发现的。总的来说,MCG-03-58-007的X射线光谱被密度为NH~10^23 cm^-2的中性柱高度吸收,这与2型活动星系核的光学分类相一致。此外,这一观测揭示了在E = 7.4 +- 0.1 keV和E = 8.5 +- 0.2 keV处存在两个深吸收槽。如果与蓝移的FeXXVI有关,这些特征可以用两个高度电离的(log λ/(erg cm/s)~ 5.5)和高柱密度(NH~5-8 x 10^23 cm ^-2)流出吸收体的存在来解释,其v_out1~ -0.1c和v_out2~-0.2c。在这次观测中探测到的盘风很可能是从距离中心黑洞几百个引力半径内发射的,并且具有与显著反馈的处方相匹配的动力学输出。盘风的低速分量的存在被后续的XMM-牛顿和NuSTAR观测的分析独立地证实。在第二次观测中还看到了风的更快(v_out~ -0.35 c)分量。在这次观测中,我们还目睹了一次持续Δt ~ 120 ksec的掩星事件,我们将其归因于盘风不透明度的增加(ΔNH~1.4x10^24 cm^-2)。我们的解释是,风的慢区(v_out~ -0.1c)是最稳定但不均匀的分量,而风的快区可能与两种不同的风的内部流线相关联。

英文摘要:

We present the discovery of a new candidate for a fast disk wind, in the nearby Seyfert 2 galaxy MCG-03-58-007. This wind is discovered in a deep Suzaku observation that was performed in 2010. Overall the X-ray spectrum of MCG-03-58-007 is highly absorbed by a neutral column density of NH~10^23 cm^-2, in agreement with the optical classification as a type 2 AGN. In addition, this observation unveiled the presence of two deep absorption troughs at E = 7.4 +- 0.1 keV and E = 8.5 +- 0.2 keV. If associated with blue-shifted FeXXVI, these features can be explained with the presence of two highly ionised (log ξ/(erg cm/s)~ 5.5) and high column density (NH~5-8 x 10^23cm^-2) outflowing absorbers with v_out1~ -0.1c and v_out2~ -0.2c. The disk wind detected during this observation is most likely launched from within a few hundreds gravitational radii from the central black and has a kinetic output that matches the prescription for significant feedback. The presence of the lower velocity component of the disk wind is independently confirmed by the analysis of a follow-up XMM-Newton & NuSTAR observation. A faster (v_out~ -0.35 c) component of the wind is also seen in this second observation. During this observation we also witnessed an occultation event lasting Δt ~ 120 ksec, which we ascribe to an increase of the opacity of the disk wind (ΔNH~1.4x10^24 cm^-2). Our interpretation is that the slow zone (v_out~ -0.1c) of the wind is the most stable but inhomogeneous component, while the faster zones could be associated with two different inner streamlines of the wind.

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