Astrophysics (Index)About

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 (by mass) of gas within a galaxy or galaxy cluster to all the baryonic mass, i.e., also including the galaxy or cluster's stars.

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.

Further reading:

Referenced by pages:
gas fraction estimation