Faber-Jackson relation

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The observed relationship between the luminosity of an elliptical galaxy and the random speed of stars near its centre. The relation has been useful in estimating the relative distances of galaxies, since the absolute magnitude of a galaxy can be determined from stellar motions within it, deduced from its spectrum. The relation is named after the American astronomers Sandra Moore Faber (1944– ) and Robert Earl Jackson (1949– ), who published it in 1976.

Subjects: Astronomy and Astrophysics.

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