Correlation Between Dark Matter & Bright Matter ?

For galaxies in the Ursa Major group, it is found that spiral galaxy
apparent luminosity, L, is related to peak stellar tangential velocity,
V_max (from spectral Doppler shift), by

L = L0 (V_max)^4 (Tully - Fisher relation)

Where L0 is a constant. On the left hand side of the equation, L
gives a measure of the visible matter in a galaxy, while, on the right
hand side, V_max yields a measure of the total matter, including
dark matter, in that galaxy wherein the majority (~ 75 %) of galactic
matter is found to be dark matter. In other words, the amount of
dark matter in a galaxy is tied to the amount of visible matter in
that galaxy. Maybe dark matter isn't so strange after all.

Reference:
"Galaxies in the Universe" (2000) LS Sparke & JS Gallagher
ISBN 0 521 59740 4

Its a great book! [Old Man]

Old Man wrote:

For galaxies in the Ursa Major group, it is found that spiral galaxy
apparent luminosity, L, is related to peak stellar tangential velocity,
V_max (from spectral Doppler shift), by

L = L0 (V_max)^4 (Tully - Fisher relation)

Where L0 is a constant. On the left hand side of the equation, L
gives a measure of the visible matter in a galaxy, while, on the right
hand side, V_max yields a measure of the total matter, including
dark matter, in that galaxy wherein the majority (~ 75 %) of galactic
matter is found to be dark matter. In other words, the amount of
dark matter in a galaxy is tied to the amount of visible matter in
that galaxy. Maybe dark matter isn't so strange after all.

Reference:
"Galaxies in the Universe" (2000) LS Sparke & JS Gallagher
ISBN 0 521 59740 4

Its a great book! [Old Man]

Thanks Old Man!
-Sam