IMBH (Intermediate black hole)
IMBH (Intermediate black hole). IMBH black hole is smaller than a supermassive black hole. But larger than a stellar black hole.
Intermediate black holes are black holes with a mass smaller than supermassive black holes, but higher than stellar black holes. The IMBHs (Intermediate Black Holes) are the "gates" between the supermassive- and stellar black holes. I recently wrote that there are three types of black holes.
1) Supermassive black holes.
2) Stellar black holes.
3) Quantum black holes.
I should mention the IMBHs. The classification where there are three types of back holes means that the term "supermassive black holes" means all black holes that are more massive than stellar black holes. So IMBH is the smaller supermassive black hole. And if we use the classification of four types of black holes. That classification looks like this.
1) Supermassive black holes.
2) IMBH (Intermediate Black holes). Those are "lightweight supermassive black holes". That means they are lighter than Sagittarius A but more massive than stellar black holes.
3) Stellar black holes like Cygnus X-1.
4) Quantum black holes.
There is a possibility that supermassive black holes form when the interstellar nebula collapses. And maybe the collapse of the interplanetary- or smaller nebula forms the IMBH. It's possible that IMBH forms when some star cluster or group of stars collide. But there is possibility. That also interplanetary nebula's collapse forms IMBH. As you see from below.
"This diagram illustrates a mechanism turning massive cluster stars (1-5) into an intermediate-mass black hole (IMBH) within about 6 million years. The sequence begins with three normal stars, two forming a binary orbiting each other (1a, 1b, 2). After a while, this stellar triple undergoes a merging event, leaving only two stars (1a, 3), which again capture a massive cluster star (4). Finally, two stars merge (1a, 3) to produce a so-called very massive star (VMS) exhibiting more than 300 solar masses. At that stage, the VMS can grow further by drawing material from its companion (4). The VMS is now massive enough to evolve into an IMBH. It continues to grow by capturing additional stars (5), eventually leading to an IMBH of 350 solar masses. Credit: © M. Arca Sedda et al. / MPIA" (ScitechDaily, Galactic Shadows: The Elusive Trail of Intermediate Black Holes)
Substellar or planetary black holes.
Theoretically is possible that if the energy level in the molecular nebula around some red dwarf or planet rises to a high enough level. That molecular cloud can press a planet or red dwarf into a black hole.
Maybe. Some substellar black holes form when some red dwarf travels through GRB or FRB. In that case. Is possible, that the temperature of the molecular cloud is around the red dwarf or planet. If that object is in the right position in the molecular cloud, that energy can press that object into the black hole.
Of course, the rise of energy level in the molecular nebula increases the energy level in the red dwarf. And increase its energy production. It's possible, that the nebula's energy state turns higher than the red dwarf's energy. In that model, the ultra-hot molecular nebula could press that red or brown dwarf or planet into the black hole.
That fascinating model means that also "substellar" or "planet mass" black holes are possible. Those object's size is not big. And there is hypothetically possible, that there is a grapefruit- or ping-pong-ball-size black hole even in our system.
https://scitechdaily.com/galactic-shadows-the-elusive-trail-of-intermediate-black-holes/
https://en.wikipedia.org/wiki/Intermediate-mass_black_hole
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