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arXiv 1901.07899astro-ph.HE
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窄线塞弗特1星系Mrk 335在X射线耀斑期间出现盘风和准直流出的证据

Evidence for an emerging disc wind and collimated outflow during an X-ray flare in the narrow-line Seyfert 1 galaxy Mrk 335

L. C. Gallo, A. G. Gonzalez, S. G. H. Waddell, H. J. S. Ehler, D. R. Wilkins, A. L. Longinotti, D. Grupe, S. Komossa, G. A. Kriss, C. Pinto, S. Tripathi, A. C. … 展开作者

L. C. Gallo, A. G. Gonzalez, S. G. H. Waddell, H. J. S. Ehler, D. R. Wilkins, A. L. Longinotti, D. Grupe, S. Komossa, G. A. Kriss, C. Pinto, S. Tripathi, A. C. Fabian, Y. Krongold, S. Mathur, M. L. Parker, A. Pradhan

摘要:

2015年12月对窄线Seyfert 1(NLS 1)Mrk 335的触发140 ks XMM-牛顿观测捕获了自2007年以来最低的X射线通量。NLS 1在观测的前120 ks是相对静止的,在最后20 ks,它的亮度大约是耀斑的5倍。虽然只有部分耀斑被捕获之前,观测终止,数据显示耀斑和静止阶段之间的显着差异。在低通量状态下,Mrk 335展示了一个反射占主导地位的光谱,这是克尔黑洞周围致密日冕的结果。除了快速增亮之外,耀斑还被光谱软化和反射率下降所描述,这与先前的观测结果一致,主张Mrk 335中至少有一部分日冕可能是中止喷流的基础。在耀斑间隔期间的光谱揭示了2-3 σ水平之间的几个残差,这可能归因于高度电离等离子体的吸收线,该等离子体在v~0.12c处向外移动。可能是耀斑期间亮度的增加增强了辐射压力,足以引发可能的风。如果风确实对日冕光度的变化有反应,那么它一定位于80 Rg以内。这个距离的逃逸速度与估计的风速相当。如果得到证实,这是第一个无线电安静活动星系核表现出扩散和准直外流行为一致的例子。

英文摘要:

A triggered 140 ks XMM-Newton observation of the narrow-line Seyfert 1 (NLS1) Mrk 335 in December 2015 caught the active galaxy at its lowest X-ray flux since 2007. The NLS1 is relatively quiescent for the first ~120 ks of the observation before it flares in brightness by a factor of about five in the last 20 ks. Although only part of the flare is captured before the observation is terminated, the data reveal significant differences between the flare and quiescent phases. During the low-flux state, Mrk 335 demonstrates a reflection-dominated spectrum that results from a compact corona around a Kerr black hole. In addition to the rapid brightening, the flare is further described by spectral softening and a falling reflection fraction that are consistent with previous observations advocating at least part of the corona in Mrk 335 could be the base of an aborted jet. The spectrum during the flaring interval reveals several residuals between the 2-3 sigma level that could be attributed to absorption lines from a highly ionised plasma that is moving outward at v~0.12c. It could be that the increased luminosity during the flare enhances the radiation pressure sufficiently to launch a possible wind. If the wind is indeed responding to the change in corona luminosity then it must be located within ~80 Rg. The escape velocity at this distance is comparable to the estimated wind velocity. If confirmed, this is the first example of a radio-quiet AGN exhibiting behaviour consistent with both diffuse and collimated outflow.

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