LSST探寻AGN光变
LSST and the Dynamic Cosmos: Unraveling AGN Variability
Time domain science play an important role in the understanding of transient and variable phenomena which are physically and phenomenologically. The Large Synoptic Survey Telescope (LSST) provide time series ranging between 1-minute and 10 yr cadence which could probe over a significant fraction of the sky and capture events from short-lived events to long-period variables. Recent observations found the AGN variability is hard to explain by unified model. The accretion-disk instabilities, changes in accretion rate, the line-of-sight absorption changes have been considered to model the observed Changing-look AGN (CLAGN). CLAGN have been found by repeat spectroscopic observations which showed significant variations. The LSST variability survey will bring the combination of size, number of observation epochs, range of timescales probed, multi-color coverage, and photometric accuracy in the observation which could enhance our understanding of AGN physics. LSST could also unveil strong transient outbursts from AGN such as tidal disruption events (TDEs) and binary SMBHs. In this talk, I will briefly introduce how LSST contributes to advancing our understanding on transient events focusing on AGN variability, temporary AGNs and cataclysmic AGN outbursts.
