期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 846, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/aa85de
关键词
accretion, accretion disks; galaxies: active; galaxies: Seyfert; infrared: galaxies
资金
- National Basic Research Program of China [2015CB857005]
- NSFC [NSFC-11233002, NSFC-11421303, NSFC-116203021, U1431229]
- Chinese Academy of Science
- NSF
- National Aeronautics and Space Administration through Science Mission Directorate Near-Earth Objects Observations Program [NNG05GF22G]
- U.S. National Science Foundation [AST-0909182]
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.
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