- #1
shounakbhatta
- 288
- 1
Hello,
I have several question in this thread which is related to velocity dispersion as well as some other areas of galaxy formation and super massive black holes (SMBH)
(1) The sigma is used to calculate the speed of the star at the edge of the galaxy and there is a direct relationship with the SMBH. The heavier the black hole, the faster the stars move around. The M Sigma relation and the Sigma -- are they the same?
(2) The velocity dispersion measures the mass of a galaxy, by determining the kinetic energy and finally the potential energy of a stable system through 'virial theorem'. Is that correct?
(3) The M Sigma relation when plotted on a graph shows that the black hole mass M is directly proportional to the stellar velocity dispersion right?
(4) The numerical figure of M σ relation states:
M/10^8M ~~...
What does '~~' means?
Thanks,
-- Shounak
I have several question in this thread which is related to velocity dispersion as well as some other areas of galaxy formation and super massive black holes (SMBH)
(1) The sigma is used to calculate the speed of the star at the edge of the galaxy and there is a direct relationship with the SMBH. The heavier the black hole, the faster the stars move around. The M Sigma relation and the Sigma -- are they the same?
(2) The velocity dispersion measures the mass of a galaxy, by determining the kinetic energy and finally the potential energy of a stable system through 'virial theorem'. Is that correct?
(3) The M Sigma relation when plotted on a graph shows that the black hole mass M is directly proportional to the stellar velocity dispersion right?
(4) The numerical figure of M σ relation states:
M/10^8M ~~...
What does '~~' means?
Thanks,
-- Shounak