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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 to the mass also including stars themselves.

    Mgas
————————————
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.


(measure,gas,mass)
http://arxiv.org/abs/1209.3665

Referenced by:
gas fraction estimation
PHIBSS

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