Black Hole Mass

Black holes appear as two distinct populations. One population is stellar mass black holes ranging between 1 and 100 solar masses, which are thought to have formed from collapse of stars and the other is super massive black holes, which usually reside at the centres of gallaxies, and whose mass ranges from millions to billions of sollar masses. For this reason we discuss the mass limits of both populations.

Least Massive
The least massive black hole is the companion of 2M05215658+435922, and its mass is estimated between 2.5 and 5.8 solar masses.

Most Massive
The most massive stellar mass black hole is the result of the black hole merger GW150914, with a mass of about 60 solar masses

Least Massive
The least massive, non stellar black hole lies in the centre of the galaxy RGG 118, and its mass is estimated at 50,000 solar masses.

Most Massive
The most massive black hole is SDSS J140821.67+025733.2 with a mass of about $$2 \cdot 10^{11} M_{\odot}$$.