arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0706.4022astro-ph
收藏

塞弗特1.8 ESO113-G010的100 kS XMM-牛顿视图。I. X射线大变率的发现和FeKalpha线复合体的研究

A 100ks XMM-Newton view of the Seyfert 1.8 ESO113-G010. I. Discovery of large X-ray variability and study of the FeKalpha line complex

Delphine Porquet, Phil Uttley, James N. Reeves, Alex Markowitz, Stefano Bianchi, Nicolas Grosso, Lance Miller, Sandrine Deluit, Ian M. George

摘要:

我们在这里介绍了2005年11月对Seyfert 1.8星系ESO 113-G 010进行的一个长(100 ks)XMM-牛顿跟踪,以便在更长的时间尺度上研究其主要的X射线特性。发现该源处于较高/较软的时间平均通量状态,对该源的时序分析显示出强烈的快速变化。功率谱密度(PSD)分析表明(95% c.l.)在3.7 x 10^-4 Hz处出现一个中断。这个截止频率与其他一些快速变化的塞弗特(如MCG-6-30-15和NGC 4051)中测得的截止频率相当。根据质光时标,我们推断M_BH的范围在4 × 10^6 - 10^7 M_odot之间,并且源以或接近爱丁顿速率(甚至更高)吸积。现有的数据不能区分光谱旋转的连续和两个组成部分的起源光谱软化,主要是因为数据没有跨越足够宽的流量范围。在双分量模型的情况下,如果存在恒定的反射分量,则通量-通量图中测量的分数偏移向更高的能量显著增加(类似于MCG-6-30-15中观察到的情况)。与2001年5月的观测结果相反,没有观测到明显的高红移发射线(这可能与源通量水平有关),而观测到了两条窄的6.5keV和7 keV的发射线。信噪比不足以确定这些线是可变的还是恒定的。正如2001年的观测所指出的那样,没有观测到明显的恒定窄的6.4keV FeK线(EW~ 32 eV),因此排除了来自遥远的冷物质的任何主要发射,例如这个塞弗特1.8型星系中的环面。

英文摘要:

(Abridged) We present here a long (100ks) XMM-Newton follow-up of the Seyfert 1.8 galaxy ESO113-G010 performed in November 2005, in order to study over a longer time-scale its main X-ray properties. The source was found in a higher/softer time-averaged flux state, and timing analysis of this source reveals strong, rapid variability. The Power Spectral Density (PSD) analysis indicates (at 95% c.l.) a break at 3.7 x 10^-4 Hz. This cut-off frequency is comparable to those measured in some other rapidly-variable Seyferts, such as MCG-6-30-15 and NGC4051. From the mass-luminosity-time-scale, we infer that M_BH ranges from 4 x 10^6 - 10^7 M_odot and the source is accreting at or close to the Eddington rate (or even higher). The existing data cannot distinguish between spectral pivoting of the continuum and a two-component origin for the spectral softening, primarily because the data do not span a broad enough flux range. In the case of the two-component model, the fractional offsets measured in the flux-flux plots increase significantly toward higher energies (similar to what is observed in MCG-6-30-15) as expected if there exists a constant reflection component. Contrary to May 2001, no significant highly redshifted emission line is observed (which might be related to the source flux level), while two narrow emission lines at about 6.5keV and 7keV are observed. The S/N is not high enough to establish if the lines are variable or constant. As already suggested by the 2001 observation, no significant constant narrow 6.4keV FeK line (EW~32eV) is observed, hence excluding any dominant emission from distant cold matter such as a torus in this Seyfert type 1.8 galaxy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑