Astro 

An intermediate sized black-hole.

BHs of mass 10^2–10^5  M⊙, more massive than stellar mass BHs and lighter than supermassive BHs (SMBHs), are traditionally designated IMBHs. A conclusive observation of these objects has thus far remained elusive, despite indirect evidence.

GW190521: A Binary Black Hole Merger with a Total Mass of 150  M⊙ (solar mass).
doi.org/10.1103/PhysRevLett.12

P.S.: The paper has two software citations, inc. 😄

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Astro 

This podcast episode covers it in detail.

Science Friday: Medium Black Holes, World of Wonders, Warsaw Typhus. Sept 11, 2020, Part 2 sciencefriday.com/episodes/sep

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