DUST REVERBERATION MAPPING IN THE ERA OF BIG OPTICAL SURVEYS AND ITS COSMOLOGICAL APPLICATION
DUST REVERBERATION MAPPING IN THE ERA OF BIG OPTICAL SURVEYS AND ITS COSMOLOGICAL APPLICATION
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DOI：
10.1088/2041-8205/784/1/l4
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发表时间：
2014-01
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影响因子：
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通讯作者：
S. Hoenig
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作者：
S. Hoenig
光学和近红外（IR）通量变化之间的时滞可以作为确定活动星系核（AGN）中超大质量黑洞周围尘埃“环面”升华半径的一种手段。我将展示来自大型光学巡天望远镜（例如大型综合巡天望远镜（LSST））的数据也可用于测量灰尘升华半径。该方法利用了热尘埃发射的维恩尾部进入光学的事实，并且可以通过高质量的光度测量可靠地恢复。模拟表明，使用 LSST 可以可靠地将大量 AGN 样本的尘埃升华半径确定为红移 z ∼ 0.1–0.2。由于活动星系核的普遍存在（高达高红移），它们已被作为宇宙学探针进行研究。在这里，我讨论了光学确定的灰尘时间延迟如何适应使用灰尘升华半径作为“标准烛光”的建议，并提出结合红外干涉测量将灰尘时间延迟扩展为“标准尺子”。
The time lag between optical and near-infrared (IR) flux variability can be taken as a means to determine the sublimation radius of the dusty “torus” around supermassive black holes in active galactic nuclei (AGNs). I will show that data from large optical survey telescopes, e.g., the Large Synoptic Survey Telescope (LSST), can be used to measure dust sublimation radii as well. The method makes use of the fact that the Wien tail of the hot dust emission reaches into the optical and can be reliably recovered with high-quality photometry. Simulations show that dust sublimation radii for a large sample of AGNs can be reliably established out to redshift z ∼ 0.1–0.2 with the LSST. Due to the ubiquitous presence of AGNs up to high redshifts, they have been studied as cosmological probes. Here, I discuss how optically determined dust time lags fit into the suggestion of using the dust sublimation radius as a “standard candle” and propose an extension of the dust time lags as “standard rulers” in combination with IR interferometry.