Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-03-22
Astronomy and Astrophysics
Astrophysics
5 pages + 3 figures, uuencoded gzipped tar format, submitted to MNRAS. Text and figures also available at http://www.mpia-hd
Scientific paper
A new solution is presented for the puzzling, observed universality of the exponential luminosity profiles, perpendicular to the disk plane of spiral and lenticular galaxies. It is shown that such exponential $z$-profiles result naturally from gaseous protodisks which settle into isothermal equilibrium prior to star formation. Subsequent cooling leads to a gravitational contraction of the gas towards the equatorial plane and to a stellar exponential $z$-profile if the star formation rate is assumed to be comparable to the cooling rate of the gas. The final stellar scale height depends only on the initial gas temperature and local surface density. This model therefore provides a new method to investigate the early energetic state of galactic protodisks with measured scale heights and surface densities along the disk plane.
Burkert Andreas
Yoshii Yoji
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