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Ranku
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By what means can a galaxy's spin increase whereby matter is expelled from the outer reaches of the galaxy?
I'm trying to understand the process by which matter can leave a spinning galaxy.Ibix said:Do you have evidence that this has happened? Please provide a link.
Ranku said:I'm trying to understand the process by which matter can leave a spinning galaxy.
Conservation of momentum doesn't preclude a random object being thrown out on a hyperbolic orbit, though i.e. to escape. The angular momentum of that object still contributes to the total angular momentum of the galaxy.DrStupid said:The matter has a net angular momentum from the beginning.
sophiecentaur said:Conservation of momentum doesn't preclude a random object being thrown out on a hyperbolic orbit, though i.e. to escape.
I would expect not. Impact yes, significant no. That's why I asked the question in post #2, because #1 reads a bit like the OP is expecting some process that alters the spin of the galaxy and causes it to eject stars en masse. I've never heard of such a thing - as far as I know any matter escaping the galaxy does so by mechanisms as you described.DrStupid said:Can something like that ever have a significant impact on the total angular momentum of the galaxy?
I am trying to understand how does a galaxy settle into its mass during its formation. Does the process of matter accretion during galaxy formation itself ensure that no matter needs to be expelled due to excess angular momentum? Or is it a process where any matter that may have been attracted during the galaxy formation process is eventually expelled if it has excess angular momentum?DrStupid said:The matter has a net angular momentum from the beginning.
DrStupid said:Reaching galactic escape velocity requires a lot of energy.
If it's a rare event then we can postulate some rare conditions. I'd suspect that, just as in a planetary system, the planets that are farthest out will have only slightly negative orbital energy. Energy needed to leave the Sun's orbit will only be just above this negative level of total energy. Waving my arms suggests that the limiting diameter of a galaxy would be affected in the same way. The final dimensions of a galaxy would be dominated by the original mass and rotational momentum of the nebula it was formed from.Ranku said:Does the process of matter accretion during galaxy formation itself ensure that no matter needs to be expelled due to excess angular momentum
Ranku said:I am trying to understand how does a galaxy settle into its mass during its formation.
sophiecentaur said:I'd suspect that, just as in a planetary system, the planets that are farthest out will have only slightly negative orbital energy.
Matter leaving a spinning galaxy refers to the movement of particles, gas, and dust away from the center of a galaxy due to its rotation. This phenomenon is known as galactic outflow.
The rotation of a galaxy creates a centrifugal force that pushes matter away from the center. In addition, the gravitational pull of nearby galaxies can also contribute to the outflow of matter.
Matter leaving a spinning galaxy can have a significant impact on the evolution of the galaxy. It can regulate the rate of star formation, distribute heavy elements throughout the galaxy, and even affect the formation of new galaxies.
Scientists use various methods to study galactic outflow, including observations with telescopes, computer simulations, and mathematical models. They also analyze the composition and movement of the outflowing matter to understand its effects on the galaxy.
Yes, matter leaving a spinning galaxy can have a significant impact on nearby galaxies. The outflowing matter can merge with the gas and dust of other galaxies, triggering star formation and influencing their evolution.