Optical Variability of Narrow-line and Broad-line Seyfert 1 Galaxies
Optical Variability of Narrow-line and Broad-line Seyfert 1 Galaxies
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DOI：
10.3847/1538-4357/aa72f4
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发表时间：
2017-05
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通讯作者：
S. Rakshit;C. .. Stalin
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作者：
S. Rakshit;C. .. Stalin
我们研究了z < 0.8的窄线Seyfert 1 （NLSy1）和宽线Seyfert 1 （BLSy1）星系的光学变异性（OV），以探讨它们的OV性质的差异。利用卡特琳娜实时瞬态巡天的档案光学v波段光曲线（跨度5-9年），并使用阻尼随机漫步对其进行建模，我们估计了变异性的幅度。我们发现，NLSy1星系作为一个整体，其变异性的幅度比宽线星系要低。在NLSy1和BLSy1星系的样本中，发现无线电噪声源比无线电噪声源具有更高的变幅。仅考虑在x射线波段探测到的源，NLSy1星系的光学变化比BLSy1星系小。NLSy1和BLSy1星系样品的变异性幅度与Fe强度呈反相关，而与Hβ线宽度相关。我们的数据中存在众所周知的变异性-光度和变异性-爱丁顿比的反相关。在射电噪声源样本中，变异性振幅与射电噪声源的响度和功率相关，表明射流在射电噪声源的OV中也起着重要作用，而Eddington比是射电噪声源OV的主要驱动因素。
We studied the optical variability (OV) of a large sample of narrow-line Seyfert 1 (NLSy1) and broad-line Seyfert 1 (BLSy1) galaxies with z < 0.8 to investigate any differences in their OV properties. Using archival optical V-band light curves from the Catalina Real Time Transient Survey that span 5–9 years and modeling them using damped random walk, we estimated the amplitude of variability. We found that NLSy1 galaxies as a class show lower amplitude of variability than their broad-line counterparts. In the sample of both NLSy1 and BLSy1 galaxies, radio-loud sources are found to have higher variability amplitude than radio-quiet sources. Considering only sources that are detected in the X-ray band, NLSy1 galaxies are less optically variable than BLSy1 galaxies. The amplitude of variability in the sample of both NLSy1 and BLSy1 galaxies is found to be anti-correlated with Fe ii strength but correlated with the width of the Hβ line. The well-known anti-correlation of variability–luminosity and the variability–Eddington ratio is present in our data. Among the radio-loud sample, variability amplitude is found to be correlated with radio-loudness and radio-power, suggesting that jets also play an important role in the OV in radio-loud objects, in addition to the Eddington ratio, which is the main driving factor of OV in radio-quiet sources.