Questions regarding interactions between galaxies or between major parts of a galaxy.
Questions tagged [galactic-dynamics]
118 questions
9
votes
1 answer
Half of the Milky Way's baryonic mass is from other galaxies - when did this happen?
The recent Phys.org article Milky Way's origins are not what they seem explains the recent MNRAS article Anglés-Alcázar et al. 2017; The cosmic baryon cycle and galaxy mass assembly in the FIRE simulations…
uhoh
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8
votes
1 answer
Python 2D Jean Instability in Spiral Galaxy Simulation
I have ~1000 snapshots of a spiral galaxy simulation (from Molecular cloud perturbations t=0 to t>1Gyr. What I need to do is determine whether any position at any of the snapshot times meets criteria for Jeans instability.
The simulation is 2D, and…
voidedbowel
- 101
- 2
8
votes
1 answer
What is the characteristic time of the evaporation of the galaxies?
For a star, to leave its galaxy, it requires probably a 3-body near-collision at the edge of the galaxy. It is unlikely, but possible. And, if a star once somehow got the required velocity to escape the galaxy, then it will escape and never comes…
peterh
- 3,161
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5
votes
3 answers
What happens to galaxies when they die?
Stars explode when they die and blast heavy elements into space. Do galaxies do the same thing?
Michael Lee
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2
votes
1 answer
1
vote
1 answer
Could discoid galaxies be expanding?
I understand that astronomers once thought that the material in the disc of a galaxy was moving around the galactic centre (where most of the mass was thought to be) in roughly circular orbits. The circular motions would be explained by the…
steveOw
- 1,444
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1
vote
0 answers
Why use this density function to derive the Lane-Emden equation?
I am currently reading Binney and Tremaines Galactic Dynamics, learning about spherical systems. In chapter 4.33 a density function (Eq. 4.83) is given as:
$$ f(\mathcal{E}) = \begin{cases} F \mathcal{E}^{n-3/2} & (\mathcal{E} > 0) \\ 0 &…
Squirrel
- 111
- 1
1
vote
0 answers
Is the Milky Way Galaxy predicted to collide with a neighboring galaxy?
Topic
I've read several articles online that state that our galaxy will collide with a neighboring galaxy in the future, but there is no evidence about it happening.
Question(s)
After reading a few articles on the topic, I started to…
Eevee
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1
vote
1 answer
Will we ever end up in the black hole?
Since we are spiraling around the black whole will we spiral into the black hole?
Rayan
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