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Astronomy and Cosmology
Astronomy and Astrophysics
Quasar Number Densities and Lifetimes
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[QUOTE="stefan r, post: 5901313, member: 615251"] (4 x 10[SUP]10[/SUP]/1 x 10[SUP]10[/SUP]) x 108 = 432 Did you mean 10[SUP]8[/SUP] instead of 108? In that case 4 x 10[SUP]8[/SUP] Is also unclear what "that we can see at anyone time" means. Large parts of the sky are blocked by the milky way or other galaxies, stars, and clouds. It will also be an uneven distribution. Not a random distribution of quasars in any time window over 10 billion years. Not all [URL='https://en.wikipedia.org/wiki/Active_galactic_nucleus']active galactic nuclei[/URL] are quasars. [/QUOTE]
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Astronomy and Cosmology
Astronomy and Astrophysics
Quasar Number Densities and Lifetimes
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