All Questions
7
questions
1
vote
0
answers
124
views
How are CMB frame redshifts of galaxies corrected for coherent flows?
Say, if I downloaded the CMB frame redshifts of some galaxies from NED database, then what is the procedure to correct it for coherent flows?
I'm using the SNooPy(snpy) Python package to analyze some ...
1
vote
1
answer
73
views
How to identify component of velocity of a star from its red shift? [duplicate]
When a telescope observes a distant star, all it sees is the light being emitted by the star. Observing the wavelength of this light, we determine the velocity of the star. If the wavelength is red-...
- 131
0
votes
1
answer
75
views
Where a database of different z values of redshift can be found?
I was working on reshift details for various galaxies but do not know any database to find the z values given to redshift galaxies. Can anyone help?
2
votes
2
answers
305
views
Is blue light not traveling faster then red light in space?
I just can't understand why light and other massless particles are not traveling at different speeds?
Gravity effects anything with a mass but light has no mass but a black hole, and weak lensing ...
- 1
3
votes
1
answer
2k
views
How do I apply a velocity shift to a wavelength array with uniform logarithmic spacing?
Suppose I have a wavelength array for a spectrum in units of Angstroms. Suppose further that the wavelength has "uniform logarithmic spacing" such that if I just take the difference in Angstroms ...
- 723
2
votes
1
answer
94
views
How do I modify redshifts to gain corrected line of sight velocities?
I'm currently trying to collect the data to run an N-body simulation for 11 of the galaxies in the Local Group where proper motions are known, however I don't understand how to get the required line ...
- 147
1
vote
2
answers
290
views
How does one measure velocities of far-off, bright objects
As the title already says, I want to know how one measures velocities of far-off, bright objects, e.g. when the mean parallax drift isn't measurable with current apparatus (this means when there is ...
- 113