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Results tagged with galaxy
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user 2424
Questions regarding systems of large numbers of stars held together by gravity.
2
votes
Accepted
Question about total absolute magnitudes of galaxies - negative or not?
And, the $V_T$ and $M_{V_T}$ (note the correct subscripting, which the authors failed to do) means the V band radial profile is extrapolated to infinite radius to give a total for the whole galaxy. …
- 4,683
2
votes
Is there a paper on galaxy mergers in clusters of galaxies?
Galaxy mergers in clusters explain the large central galaxies in clusters. … Dynamical friction makes galaxies spiral down toward the center where they get eaten by the central galaxy and that in turn makes the central galaxy more massive and more efficient at this process. …
- 4,683
2
votes
Accepted
Fate of lone spiral galaxies?
I do agree that a given spiral galaxy can sometimes have a bar and sometimes not. …
- 4,683
1
vote
How do we know we're not getting bigger?
Locally, we are in a closed region called the Local Group, and the Andromeda galaxy is approaching. …
- 4,683
1
vote
Accepted
Question regarding the Milky Way when calculating galactic space velocities for galaxies
v$_r$ and μ are radial velocities and proper motion as seen from the Sun (ie heliocentric) and the equations in the appendix convert to v in the $S_o$ frame which is the center of the Galaxy. …
- 4,683
2
votes
Accepted
Can the collapse of a gas cloud lead to an elliptical structure?
The shape of a collapsing cloud is influenced by various factors, including the initial shape, angular momentum, ability to dissipate heat, and sub-clumping processes. When a gas cloud collapses, it c …
- 4,683
4
votes
Accepted
Dark Flow: statistical limits on existence
The dipole in the microwave background indicates motion of the Milky Way and thus of the whole Local Group, at least, at about 600 km/s in a certain direction. The straightforward explanation is that …
- 4,683
10
votes
Could light be dark matter?
Most of the light energy in the universe is still in the microwave background (MWB). The Wikipedia page on the MWB states its 2.7 K temperature implies it is making up a fraction of roughly $6 \times …
- 4,683