arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1610.03076astro-ph.GA
收藏

NGC 1068:尽管存在X射线变异性,但中红外环面结构无变化

NGC 1068: No change in the mid-IR torus structure despite X-ray variability

N. López-Gonzaga, D. Asmus, F. E. Bauer, K. R. W. Tristram, L. Burtscher, A. Marinucci, G. Matt, F. A. Harrison

摘要:

上下文最近的NuSTAR观测显示,NGC 1068的原子核X射线通量出现了一些意想不到的增加。我们预期尘埃环的红外辐射会对吸积盘的内在变化产生反应。目的。我们的目的是调查的起源X射线变化的调查中红外环境的响应。方法.我们获得了单孔径和干涉中红外测量,并直接比较了X射线变化之前和之后立即观察到的测量结果。直接比较平均相关通量和单孔通量以及微分相位,以检测$\sim$ 2 pc尺度上核发射结构的可能变化。结果在X射线变化之前和期间的观测的通量密度和微分相位在十年的时间内没有显示出显著的变化。红外发射的可能微小变化为$\lesssim$ 8%。结论.我们的研究结果表明,NGC 1068的中红外环境十年来一直保持不变。最近X射线的瞬时变化并没有引起红外发射的显著变化。这项独立的研究支持了以前的结论,即NuSTAR观测检测到的X射线变化是由于X射线发射穿透了尘埃区域的一个不规则部分。

英文摘要:

Context. Recent NuSTAR observations revealed a somewhat unexpected increase in the X-ray flux of the nucleus of NGC 1068. We expect the infrared emission of the dusty torus to react on the intrinsic changes of the accretion disk. Aims. We aim to investigate the origin of the X-ray variation by investigating the response of the mid-infrared environment. Methods. We obtained single-aperture and interferometric mid-infrared measurements and directly compared the measurements observed before and immediately after the X-ray variations. The average correlated and single-aperture fluxes as well as the differential phases were directly compared to detect a possible change in the structure of the nuclear emission on scales of $\sim$ 2 pc. Results. The flux densities and differential phases of the observations before and during the X-ray variation show no significant change over a period of ten years. Possible minor variations in the infrared emission are $\lesssim$ 8 %. Conclusions. Our results suggest that the mid-infrared environment of NGC 1068 has remained unchanged for a decade. The recent transient change in the X-rays did not cause a significant variation in the infrared emission. This independent study supports previous conclusions that stated that the X-ray variation detected by NuSTAR observations is due to X-ray emission piercing through a patchy section of the dusty region.

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。

↑