An Intermediate-mass Black Hole Lurking in A Galactic Halo Caught Alive during Outburst

C. -C. Jin, D. -Y. Li, N. Jiang +137

Stellar-mass and supermassive black holes abound in the Universe, whereas intermediate-mass black holes (IMBHs) of ~10^2-10^5 solar masses in between are largely missing observatio…