绝对光度
绝对光度-
一旦它们的绝对光度得到标定，就可以定出哈勃常数H0。
Once the absolute luminosity of SNe Ia is determined , we can get the value of the Hubble parameter .
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SAS-2的Υ辐射数据，已被用来测定类星体和赛弗特星系的Υ辐射绝对光度与光学绝对光度间的函数关系，并由此导出它们对河外Υ射线背景辐射的贡献。
The SAS-2 r-ray data have been employed to determine the functional relationships between the absolute y-ray luminosities Ly and the absolute optical luminosities of quasars and Seyfert galaxies . From these , their contribution to the extragalactic y-ray background have been derived .
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光谱滤波技术对星等测量精度的影响远红外绝对分光光度计
Precision of magnitude measurement caused by spectral filtering technology far infrared absolute spectrophotometer
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远红外绝对分光光度计
Far infrared absolute spectrophotometer