Apparent [O iii] variability in the narrow line Seyfert I Mrk142

Apparent [O iii] variability in the narrow line Seyfert I Mrk142
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窄线 Seyfert I Mrk142 中明显的 [OIII] 变异性

DOI:
10.1093/mnrasl/slv204
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发表时间:
2015-12
影响因子:
4.8
通讯作者:
Feng Longlong
Feng Longlong
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhang Xueguang;Feng Longlong

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在这封信中,我们检查了众所周知的窄线Seyfert I Mrk142的光谱特性,试图找到窄线变异性对Mrk142的BLR半径的影响,Mrk142是R-L平面上的一个离群值。虽然在BLR半径上没有发现改善,但在Mrk142中可以证实明显的窄线变异性。利用Lick AGN监测项目采集的公共光谱,通过考察宽窄发射谱线特性,首先验证了基于\oiii线常数假设的光谱标度方法。应用谱标度方法发现,\oiii线通量与\oiii线宽度之间存在较强的相关性,而宽H $\alpha$通量与宽H $\beta$通量之间以及宽H $\alpha$通量与5100 \AA连续辐射之间的相关性较弱。结果表明,不建议采用\oiii线为常数的假设,在采用光谱标度定标方法时应谨慎。然后,我们可以发现\oiii线通量与5100 \AA处的连续辐射之间存在很强的相关性,这表明Mrk142中\oiii线在大约两个月内存在明显的短期变异性。
In this letter, we checked spectral properties of the well-known narrow line Seyfert I Mrk142, in order to try to find effects of narrow line variability on BLR radius of Mrk142 which is an outlier in the R-L plane. Although, no improvement can be found on BLR radius, apparent narrow line variability can be confirmed in Mrk142. Using the public spectra collected from the Lick AGN Monitoring Project, the spectral scaling method based on assumption of constant \oiii line is firstly checked by examining broad and narrow emission line properties. We find that with the application of the spectral scaling method, there is a strong correlation between the \oiii line flux and the \oiii line width, but weaker correlations between the broad H$\alpha$ flux and the broad H$\beta$ flux, and between the broad H$\alpha$ flux and the continuum emission at 5100\AA. The results indicate that the assumption of constant \oiii line is not preferred, and caution should be exercised when applying the spectral scaling calibration method. And then, we can find a strong correlation between the \oiii line flux and the continuum emission at 5100\AA, which indicates apparent short-term variability of the \oiii line in Mrk142 over about two months.
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