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THE IRON Kα LINE PROFILE IN NGC 4151

机译:NGC 4151中的铁Kα线轮廓

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We present the first measurements of the Fe Kα line profile in NGC 4151 from ASCA observations performed in 1993 May, November, and December. The apparent line profile is asymmetric, consisting of a peak at ~6.3-6.4 keV, a sharp drop on the blue side below ~7 keV, and a broad red wing extending to ~4-5 keV. This first clear indication of complex structure confirms earlier tentative measurements of the Fe-K region with the Broad Band X-Ray Telescope (BBXRT). The line intensity, equivalent width, and detailed shape are model dependent. Interpretation of the profile in terms of emission from a disk rotating around a central black hole strongly constrains the putative disk to be face on, but this contradicts the current body of knowledge of the geometry of this source. If the apparent red wing is not in fact part of a peculiar continuum, then a face-on disk may be allowed only if the collimated structure observed at the parsec scale is misaligned with respect to the disk normal by at least 20° and iron is overabundant by a factor of ~2, with some additional caveats. Alternatively, a different geometry of line-emitting material may be required. In contrast to clear variability in the soft X-ray line emission below ~1 keV between the observations, these data show no significant variability of the Fe Kα overall line shape, intensity, or equivalent width.
机译:我们根据1993年5月,11月和12月进行的ASCA观测结果,对NGC 4151中的FeKα谱线进行了首次测量。视在线轮廓是不对称的,由在6.3〜6.4 keV处的峰值,在〜7 keV以下的蓝色面急剧下降以及延伸到〜4-5 keV的宽阔的红色翅膀组成。这是复杂结构的第一个清晰迹象,证实了较早的尝试使用宽带X射线望远镜(BBXRT)对Fe-K区进行了测量。线强度,等效宽度和详细形状取决于模型。从围绕中心黑洞旋转的圆盘的发射方面来解释轮廓,强烈地限制了假定的圆盘要面朝上,但这与该源的几何学的现有知识相矛盾。如果视在的红翼实际上不是特殊连续体的一部分,则只有在以秒差距标度观察到的准直结构相对于盘法线未对准至少20°且铁为铁时,才允许面朝上的盘丰度约2倍,还有一些附加警告。替代地,可能需要线发射材料的不同几何形状。观测之间,软X射线线发射在低于〜1 keV时具有明显的变异性,这些数据表明FeKα的整体线形,强度或等效宽度没有明显的变异性。

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