“source count”的概念、定义、翻译、参考文献-科学参考

source count

Astronomy

A statistical technique used to study the evolutionary history of the Universe. It involves counting the numbers of radio sources, N, above a threshold flux density, S, in a given area of sky. If the Universe is flat and the luminosity and space density of radio sources has not evolved with time, then a plot of N against S on logarithmic axes should be a straight line of slope −1.5. Deviations from this line for the faintest (and hence most distant) sources show that radio sources were both more powerful and more numerous in the early Universe, and are strong evidence that the Universe has evolved with time.

单词	source count
释义	source count Astronomy A statistical technique used to study the evolutionary history of the Universe. It involves counting the numbers of radio sources, N, above a threshold flux density, S, in a given area of sky. If the Universe is flat and the luminosity and space density of radio sources has not evolved with time, then a plot of N against S on logarithmic axes should be a straight line of slope −1.5. Deviations from this line for the faintest (and hence most distant) sources show that radio sources were both more powerful and more numerous in the early Universe, and are strong evidence that the Universe has evolved with time.
随便看	sounding rocket sound-level meter sound money soundness soundness theorem sound player sound pressure level sound recording sound reproduction soundscape sound speed soundtrack sound wave source source alphabet source code source code control source coding source coding theorem source compression coding source compression factor source count source follower source impedance source(in transportation problems)