Home
- Seminars and Workshops
- Institute of Astronomy and Astrophysics
- Location
R1203 of the Astronomy-Mathematics Building, National Taiwan University
- Speaker Name
Yu-Ching (Tony) Chen, UIUC
- State
Definitive
- Url
Searching binary supermassive black holes in astronomical surveys
2021-01-13 14:00 - 15:30
Binary Supermassive Black Holes (BSBHs) are important objects for studying galaxy evolution, gravitational wave, and cosmology. However, searching close BSBHs at high redshift (z>1) is difficult due to the angular resolution of the telescopes. For the first half of the talk, I will present our new discovery of candidate periodic quasars as possible BSBHs at milli-pc scale. The search is based on 20-yr light curves by combining DES and SDSS. I will also discuss the implications of those candidates. For the second half of the talk, I will show a new astrometric technique to find the unresolved dual/lensed quasars at (sub)kpc scale using Gaia. The follow-up HST observations returned handful dual/lensed quasar candidates proving the feasibility of the technique. Those candidates if confirmed could form a pilot sample for studying close dual AGNs at high redshift.
