Astrophysics (index)

Gas Fraction

(Gas Mass Fraction, Baryonic Gas Fraction)
(fraction of a galaxy or cluster consisting of gas)

Gas Fraction (or Gas Mass Fraction or Baryonic Gas Fraction) is the ratio of the mass of Baryons in the form of gas in a region such as a Galaxy or Galaxy Cluster (CL) to the mass also including stars themselves.

Mgas + Mstars

The term Molecular Gas Fraction is similar, but indicates the gas mass in the numerator is specifically gas in molecular form, i.e., "ready" for Star Formation (SF).


Referenced by:
Gas Fraction Estimation