论文标题
三个放射优惠星系中的无线电和X射线变异性观察到的准单独观察
Quasi-simultaneous observations of radio and X-ray variability in three radio-quiet Seyfert galaxies
论文作者
论文摘要
某些无线电定价（RQ）活性银河系核的无线电变异性表明，靠近中央发动机的区域，可能是外部积聚的圆盘电晕。如果无线电和X射线发射的起源与物理相关，则它们的发射可能暂时相关，可能与一些时间延迟。我们介绍了对三个RQ Seyfert星系，MRK 110，MRK 766和NGC 4593的X射线广播和X射线监测的结果，在大约300天内，在8.5 GHz的情况下进行了非常大的阵列，以及Rossi X射线的时间表，在2-10 kev的2-10 kev时，大约在2-10天。可能在最高分辨率（配置）观察结果的MRK 110和NGC 4593中检测到无线电核的可变性，分别可变性幅度分别为6.3％和9.5％。互相关分析表明，MRK 110中显然强（Pearson r = -0.89）和高度显着的相关性（P = 1 x 10^（-6）），无线电滞后于56天。但是，对物理不相关的长时间延迟的R值分布的进一步分析表明，这种相关性并不重要。这是因为Pearson相关性假定白噪声，而X射线和无线电曲线都遵循红噪声，这将大幅度增加的机会增加了〜10^3，以在不相关的数据集中获得极高的R值。为了可靠地检测延迟，需要具有更高的采样率的无线无线电监视（优选使用高分辨率固定无线电阵列）。
Radio variability in some radio-quiet (RQ) active galactic nuclei suggests emission from regions close to the central engine, possibly the outer accretion disc corona. If the origins of the radio and the X-ray emission are physically related, their emission may be temporarily correlated, possibly with some time delays. We present the results of quasi-simultaneous radio and X-ray monitoring of three RQ Seyfert galaxies, Mrk 110, Mrk 766, and NGC 4593, carried out with the Very Large Array at 8.5 GHz over a period of about 300 days, and with the Rossi X-ray Timing Explorer at 2-10 keV over a period of about 2000 days. The radio core variability is likely detected in the highest resolution (A configuration) observations of Mrk 110 and NGC 4593, with a fractional variability amplitude of 6.3% and 9.5%, respectively. A cross-correlation analysis suggests an apparently strong (Pearson r = -0.89) and highly significant correlation (p = 1 x 10^(-6)) in Mrk 110, with the radio lagging the X-ray by 56 days. However, a further analysis of the r values distribution for physically unrelated long time delays, reveals that this correlation is not significant. This occurs since the Pearson correlation assumes white noise, while both the X-ray and the radio light curves follow red noise, which dramatically increases the chance, by a factor of ~ 10^3, to get extremely high r values in uncorrelated data sets. A significantly longer radio monitoring with a higher sampling rate, preferably with a high-resolution fixed radio array, is required in order to reliably detect a delay.
