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Abstract:
Time Domain Astronomy has been getting popular especially in optical
astronomy, mainly using wide-field imaging instruments. Hyper
Suprime-Cam (HSC) on the 8.2-m Subaru telescope currently has the best
survey capability in terms of survey speed. We have been conducting
transient surveys with Subaru/HSC in various time scales from minutes
to years since its first light in 2014. I will summarize several main
results from our transient surveys. In the latter part of my talk, I
focus on one distant active galactic nucleus (AGN) showing a very
large decline in brightness over 20 years. This object is interpreted
as a rare phenomena in an AGN where its accretion activity has been
almost shut down.
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