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Number of Stars per Co Moving Unit Volume?
How many stars are there per Gpc^3 Co Moving Volume of the Universe?
I entered numbers into Ned Wright's calculator to find Co Moving volumes (and radii) for the universe at different z values, in 1Gyr increments back to 13 Gyrs in the past. I got the following values using the default settings and "General" button, (which I think includes the acceleration to the expansion of the universe due to Dark Energy): Co Moving Volume Gpc^3 0.134 1.205 4.571 12.252 27.232 53.97 99.348 174.105 296.192 497.486 842.187 1484.868 2997.275 at Universe age - 0.721 Gyrs / z=3D7.368 If there are about 100E9 stars per galaxy and 100E9 galaxies in universe, do I essentially have 1.0E22 stars per 2997 Gpc^3? ie, rho_stars ~ 3.34E18 stars / Gpc co moving volume? So that for each co moving volume above, I can multiply by this value to get the number of stars within each co moving volume? Ross |
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