Mid-infrared Variability of Changing-look AGNs

被引：111

作者：

Sheng, Zhenfeng ^{[1
,2
]}

Wang, Tinggui ^{[1
,2
]}

Jiang, Ning ^{[1
,2
]}

Yang, Chenwei ^{[1
,2
]}

Yan, Lin ^{[3
,4
]}

Dou, Liming ^{[5
,6
]}

Peng, Bo ^{[1
,2
]}

机构：

[1] Univ Sci & Technol China, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China

[2] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China

[3] CALTECH, Caltech Opt Observ, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA

[4] CALTECH, Infrared Proc & Anal Ctr, Pasadena, CA 91125 USA

[5] Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Guangdong, Peoples R China

[6] Dept Educ Guangdong Prov, Astron Sci & Technol Res Lab, Guangzhou 510006, Guangdong, Peoples R China

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2017年 / 846卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

accretion; accretion disks; galaxies: active; galaxies: Seyfert; infrared: galaxies; ACTIVE GALACTIC NUCLEI; SEYFERT-1; GALAXIES; EMISSION; SPECTROPOLARIMETRY; QUASARS;

D O I：

10.3847/2041-8213/aa85de

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

It is known that some active galactic nuclei (AGNs) transit from Type 1 to Type 2 or vice versa. There are two explanations for the so-called changing-look AGNs: one is the dramatic change of the obscuration along the line of sight, and the other is the variation of accretion rate. In this Letter, we report the detection of large amplitude variations in the mid-infrared luminosity during the transitions in 10 changing-look AGNs using the Wide-field Infrared Survey Explorer (WISE) and newly released Near-Earth Object WISE Reactivation data. The mid-infrared light curves of 10 objects echo the variability in the optical band with a time lag expected for dust reprocessing. The large variability amplitude is inconsistent with the scenario of varying obscuration, rather it supports the scheme of dramatic change in the accretion rate.

引用

页数：7

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