Chronos said:A quasar is believed to be an actively feeding supermassive black hole. Such a feeding frenzy is probably unlikely until galaxy formation is well underway.
So let's take an extremely fast spinning Kerr black hole with a large mass M, how long does it take to evaporate for a given background temperature?Mordred said:That process would take longer than the age of the universe.
For a fast spinning Kerr black hole or a Schwarzschild black hole?Mordred said:A 1 solar mass black hole would take roughly 2.0*10^67 years
1. Would you agree that most (if not all) black holes in our universe spin?Mordred said:The figute above is Shwartzchild non rotating
Mordred said:Good luck but you won't find any theory that a supermassive black hole will eventually collapse into a galaxy. For that matter the only theory that suggests black holes can ever evaperate is by Hawking radiation. That process would take longer than the age of the universe.
However the gravitational influences of black holes may assist galaxy formation.
Quasars are a result of the formation of galaxies. It doesn't even make sense to talk about a galaxy forming from a quasar, any more than it makes sense for a solar system to form from a planet.SpiderET said:Im wondering, if there is some theory, which is proposing that galaxies were formed from quasars?
Or if not, are there some facts which are opposing such formation?
Chalnoth said:Quasars are a result of the formation of galaxies. It doesn't even make sense to talk about a galaxy forming from a quasar, any more than it makes sense for a solar system to form from a planet.
The reason why I used a planet as the example in the analogy is because the supermassive black holes at the centers of galaxies tend to be, at most, a few percent of the galaxies' mass. The Sun, on the other hand, contains nearly all of the mass of our solar system. So a quasar is much more like Jupiter in the analogy: significant impact on the structure of the solar system (e.g. by preventing the planet that tried to form in the asteroid belt from actually forming), but a small fraction of the total mass, and in no sense the cause of the solar system forming in the first place.SpiderET said:I doubt that this solar system example is relevant. Solar system evolved around Sun in the center, not around planet.
Quasars are what happens when the nuclei of galaxies gobble up matter. This happens when galaxies first form, and can also happen when galaxies collide.SpiderET said:But the question is as following: Is it possible, that quasars are only an early stage in evolution of rotating galaxies?
Chalnoth said:The reason why I used a planet as the example in the analogy is because the supermassive black holes at the centers of galaxies tend to be, at most, a few percent of the galaxies' mass. The Sun, on the other hand, contains nearly all of the mass of our solar system. So a quasar is much more like Jupiter in the analogy: significant impact on the structure of the solar system (e.g. by preventing the planet that tried to form in the asteroid belt from actually forming), but a small fraction of the total mass, and in no sense the cause of the solar system forming in the first place.
Quasars are what happens when the nuclei of galaxies gobble up matter. This happens when galaxies first form, and can also happen when galaxies collide.
SpiderET said:Yes, but I am not sure if this is answer to my question.
Both galaxies and quasars probably have supermassive black hole in the center. The question is, could it be possible, that over time quasars evolve into standard rotating galaxies?
Is there some theory which is predicting such evolution? I personally do believe, that supermassive black hole in center of quasar decreases feeding and gravitational pull over time and then it evolves into standard galaxy. Now I am searching for theories which would either predict something similar or are ruling it out.
Indeed, there's evidence of jets streaming from the center of our own galaxy that indicate that our black hole may have been active as recently as 20,000 years ago:P.Bo said:Quasars are part of a galaxy, they're they're just the active galactic nucleus of a SMBH gobbling up matter. Eventually they will fizzle out, whether it's the energy output pushing material away, or there's "no more stuff" to eat... in which case a quasar becomes a non-active galaxy kind of like the Milky Way, which could have been a quasar in the past (or at the very least some type of other active galaxy)
Galaxies can form from quasars through a process called galaxy merging. When two or more galaxies collide, the gas and dust in each can become compressed and trigger the formation of new stars. Quasars, which are extremely bright and active supermassive black holes at the center of galaxies, can also contribute to the formation of new stars by heating up the gas and dust in their vicinity.
Quasars are the most luminous and energetic objects in the universe, powered by supermassive black holes at their centers. They are typically found at the centers of galaxies, indicating a strong connection between the two. In fact, it is believed that quasars may have played a crucial role in the formation and evolution of galaxies.
No, not all galaxies are formed from quasars. While quasars may have been involved in the formation of many galaxies, there are other processes that can lead to the formation of galaxies, such as galaxy collisions, gas accretion, and mergers of smaller galaxies.
The exact timeline for how long it takes for a quasar to form a galaxy is still uncertain. It likely depends on a variety of factors, including the mass of the black hole, the rate at which it is accreting matter, and the environment in which it is located. It is estimated that the process could take anywhere from millions to billions of years.
Yes, quasars can still exist in galaxies that have already formed. In fact, many galaxies, including our own Milky Way, have a central supermassive black hole that could potentially become active and form a quasar in the future. However, the likelihood of this happening decreases as the galaxy ages and the black hole's supply of gas and dust decreases.