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arXiv 1502.06771astro-ph.GAastro-ph.CO
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Seyfert 1星系PGC50427的宽线区和尘埃环的大小

The broad-line region and dust torus size of the Seyfert 1 galaxy PGC50427

F. Pozo Nuñez, M. Ramolla, C. Westhues, M. Haas, R. Chini, K. Steenbrugge, A. Barr Domínguez, L. Kaderhandt, M. Hackstein, W. Kollatschny, M. Zetzl, Klaus W. Hodapp, M. Murphy

摘要:

本文介绍了对$z = 0.024$ 1型活动星系核(AGN)PGC 50427的三年观测结果。通过使用宽频带和窄带滤波器的光度混响映射,我们通过测量连续谱的可变性和H $α$发射线之间的时间延迟来确定宽线发射区域的大小。H $α$发射线响应蓝色连续变化,平均静止帧滞后$19.0 \pm 1.23$天。利用单历元谱,我们确定了宽线H $α$速度宽度为1020 km s $^{-1}$,结合静止标架滞后和采用几何标度因子$f = 5.5$,我们计算了黑洞质量为$M_{BH} \sim 17 \times 10^{6} M_{\odot}$ .利用通量变化梯度法,我们将主星系的贡献从活动星系核的贡献中分离出来,计算了观测时的静止坐标系5100 nm ~的光度。利用静止帧滞后和主星扣除光度,我们得到了PGC 50427在BLR大小-活动星系核光度图中的位置,这与理论上预期的$R \propto L^{0.5}$关系非常接近。同时进行的光学和近红外(PDMATHAMT和PDMATHAMU)观测使我们能够通过使用尘埃混响映射方法来确定尘埃环的大小。我们发现,热尘排放($\sim 1800K$)滞后于光学变化的平均休息帧滞后$46.2 \pm 2.60$天。尘埃反射半径和核近红外光度允许我们推导出的位置,PGC 50427上已知的$τ- M{V}$图。对宽线区和尘埃热辐射的观测表明,最内层的尘埃环位于PGC 50427的BLR之外,支持活动星系核的统一方案。(摘要缩短,见手稿。)

英文摘要:

We present the results of a three years monitoring campaigns of the $z = 0.024$ type-1 active galactic nucleus (AGN) PGC50427. Through the use of Photometric Reverberation Mapping with broad and narrow band filters, we determine the size of the broad-line emitting region by measuring the time delay between the variability of the continuum and the H$α$ emission line. The H$α$ emission line responds to blue continuum variations with an average rest frame lag of $19.0 \pm 1.23$ days. Using single epoch spectroscopy we determined a broad-line H$α$ velocity width of 1020 km s$^{-1}$ and in combination with the rest frame lag and adoption a geometric scaling factor $f = 5.5$, we calculate a black hole mass of $M_{BH} \sim 17 \times 10^{6} M_{\odot}$. Using the flux variation gradient method, we separate the host galaxy contribution from that of the AGN to calculate the rest frame 5100Å~ luminosity at the time of our monitoring campaign. The rest frame lag and the host-subtracted luminosity permit us to derive the position of PGC50427 in the BLR size -- AGN luminosity diagram, which is remarkably close to the theoretically expected relation of $R \propto L^{0.5}$. The simultaneous optical and NIR ($J$ and $K_{s}$) observations allow us to determine the size of the dust torus through the use of dust reverberation mapping method. We find that the hot dust emission ($\sim 1800K$) lags the optical variations with an average rest frame lag of $46.2 \pm 2.60$ days. The dust reverberation radius and the nuclear NIR luminosity permit us to derive the position of PGC50427 on the known $τ- M{V}$ diagram. The simultaneus observations for the broad-line region and dust thermal emission demonstrate that the innermost dust torus is located outside the BLR in PGC50427, supporting the unified scheme for AGNs. (Abstract shortened, see the manuscript.)

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