论文标题
瞬时X射线观测瞬时源Cygnus A-2
Late-Time X-ray Observations of the Transient Source Cygnus A-2
论文作者
论文摘要
We examine Chandra observations of the powerful Fanaroff-Riley class II (FR II) radio galaxy Cygnus A for an X-ray counterpart to the radio transient Cygnus A-2 that was first detected in 2011. Observations are performed using the High-Resolution Camera (HRC) instrument in order to spatially resolve Cygnus A-2 and the central Active Galactic Nucleus (AGN) at a separation of 0.42 arcseconds.模拟图像是由发射区域产生的，并提取了感兴趣区域的径向轮廓。模拟与观察之间的比较表明，Cygnus A-2对0.5-7.0 KeV通量上限$ 1.04 \ times 10^{ - 12} \ rm \，erg \，erg^，cm^{ - 2}} 10^{42} \ rm \，erg \，s^{ - 1} $。我们根据X射线通量极限估算Cygnus A-2的黑洞质量，发现它与燃烧的黑洞一致，而不是稳定增强的来源。还将HRC观察结果与2016 - 2017年的档案ACI数据进行比较，并且AGN复合物的总体形态和两个数据集之间的磁通限。尽管ACI的堆积效应在以前被认为是AGN观察到的形态，但这种一致性仍然存在。数据集之间的一致性证明了利用Cygnus a的档案Chandra数据以前所未有的精度分析其AGN的可行性。
We examine Chandra observations of the powerful Fanaroff-Riley class II (FR II) radio galaxy Cygnus A for an X-ray counterpart to the radio transient Cygnus A-2 that was first detected in 2011. Observations are performed using the High-Resolution Camera (HRC) instrument in order to spatially resolve Cygnus A-2 and the central Active Galactic Nucleus (AGN) at a separation of 0.42 arcseconds. Simulated images are generated of the emission region, and radial profiles for the region of interest are extracted. A comparison between the simulations and observations reveals no X-ray detection of Cygnus A-2 to a 0.5-7.0 keV flux upper limit of $1.04 \times 10^{-12}\rm\,erg\,cm^{-2}\,s^{-1}$, or a rest-frame 2-10 keV luminosity of $8.6\times 10^{42}\rm\,erg\,s^{-1}$. We estimate the black hole mass of Cygnus A-2 based on our X-ray flux limit and find it to be consistent with a flaring black hole rather than a steadily accreting source. The HRC observations are additionally compared with archival ACIS data from 2016-2017, and both the overall morphology and the flux limits of the AGN complex agree between the two datasets. This consistency is despite the pile-up effect in ACIS which was previously considered to bias the observed morphology of the AGN. The agreement between the datasets demonstrates the viability of utilizing the archival Chandra data of Cygnus A to analyze its AGN at an unprecedented level of precision.
