Questions tagged [supermassive-black-hole]
Questions regarding the most massive examples of black holes that typically reside at the centers of galaxies.
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Could a super massive black hole actually be primordial black hole in disguise?
If primordial black hole do exists today could it be responsible for galaxies maybe even quasars, I mean these ancient monsters gobble up all materials in its wake and grow bigger and eventually ...
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What is the mechanism through which mass is converted to thermal energy in the accretion disc of a black hole?
In the book The Cosmic Perspective, it is stated that as matter is falling into a supermassive black hole, up to $40\%$ of its mass are converted to thermal energy, making the accretion of matter ...
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If black holes contain dark energy would the expansion of the universe be uniform?
Because black holes are different sizes presumably they would contain different quantities of dark energy and so some galaxies would accelerate faster in some directions than others.
Dark energy from ...
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Did the Grus star get expelled from the Milky way because it was accelerated by the Sagittarius A black hole?
On Wikipedia there is an article that says a star may have been expelled from the Milky Way because it interacted with Sagittarius A.
Sagittarius A* from Wikipedia:
In July 2019, astronomers reported ...
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Does the (relative) distance of the photon sphere from the center of a black hole vary according its mass?
I know that the photon circle or photon sphere is located at around 1.5 times the radius of the Schwarzschild event horizon, but wouldn't it be comparatively further out for smaller black holes?
After ...
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What do the symbols signify in Dr. Becky Smethurst's radiation pressure equation for black holes?
In her most recent video, "An ULTRAMASSIVE black hole has been discovered in a BRAND NEW way!", as well as a previous video, "How massive can black holes get?", Dr. Becky Smethurst ...
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How does Very Long Baseline Interferometry work?
According to internet sources, this technique increases the effective diameter of the telescope, thus improving the angular resolution of the telescope. However I don't understand how this actually ...
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What's the meaning of "hard supermassive black hole binary"?
In this paper, the authors state in the Introduction that
A hard SMBHB [SuperMassive Black Hole Binary] can eject surrounding stars to transfer their orbital energy and angular momentum, which may be ...
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Can magnetism escape a black hole?
I know light, and practically nothing but gravity can escape a black hole. My question is: can magnetism escape a black hole?
A couple things that convince me it can are:
Jupiter's magnetic field ...
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Could we detect dark matter by black holes gaining unexplained mass?
Dark matter is said to interact only gravitationally, so it won't commonly form black holes by itself. But if a black hole is already there, and dark matter encounters the event horizon, it should go ...
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Black Hole Collision & Gravitational Waves
The Gravitational waves detected by LIGO on 14th September 2015 are attributed to a collision of two black holes, which had been rotating near the speed of light around each other just before the ...
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Would Hubble Space Telescope improve black hole image observed by EHT if it joined array of telesopes?
My question is related to black hole image released in April. As far as I understand idea of EHT, it joins observations from multiple locations to work like one telescope with radius that is equal to ...
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What is the rotational speed of Sagittarius A*?
Sagittarius A* is the Milky Way's own supermassive black hole. Up till recently, I used to think that Sagittarius A* was a static black hole, i.e. It had no rotational speed at all.
But after doing a ...
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If a black hole has a mass of a universe what will be the volume of it?
Will it suck the entire universe in? What will the black hole look like to us, assuming we do not immediately get sucked in?
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Will the universe eventually merge completely into a single, enormous BH
I see other similar questions, but mine is more specific: If total merger into one BH is the ultimate endgame, then if the universe had no net angular momentum in the beginning, then wouldn't the ...
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