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The application of physical theory to celestial systems such as stars, planets, galaxies, supernovae, and black holes. Astrophysics proper is concerned with explaining phenomena more so than making observations, the latter falling under the purview of astronomy.

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Regarding my question, I went to a conference with Dr. Asimina Arvanitaki, and she answered by saying that there are no compelling data to be sure what happens at the edge, so this is still a mystery. …
answered Sep 13 '16 by user115376
1
vote
1answer
A polytrope is a relation between the pressure and the density of the form $$P\sim \rho^\gamma\equiv\rho^{1+1/n}$$ where $n$ is usually referred as the "polytropic index" and in principle could vary i …
asked Apr 2 '18 by user115376
1
vote
1answer
As I have read in the literature, the virial radius of a dark matter halo is the radius of a sphere such that the density $\frac{M_{\text{virial}}}{\frac{4\pi}{3}R_{\text{virial}}^{3}}=97.2\rho_{\text …
asked Jul 2 '17 by user115376
1
vote
0answers
Is there a limit of baryonic masses $M_{B}$ ($M_{B}=M_{\star}+M_{g}$), beyond which a spiral galaxy is no longer rotationally supported? Like for example: Could spiral galaxies of baryonic masses $M_{ …
asked Jun 27 by user115376
3
votes
3answers
What happens at the edge (around the optical radius) of a galaxy when it has a flat rotation curve? After some length scale: does the velocity start to decrease or is there a phase-transition-like tha …
asked Sep 12 '16 by user115376
2
votes
0answers
I'm starting a new project on dark matter astrophysics in which I have to extract from some data (I will write some below) the surface brightness, to later construct the mass density profiles of de …
asked Oct 15 '15 by user115376
0
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1answer
Dark matter is suppose to form large halos of unknown yet type of particle with a specific density density profile. Does the dark matter halo can be viewed as a fluid of particles with density and non …
asked Aug 13 '18 by user115376