The origin of galactic discs with exponential z-profiles | Zendy

Andreas Burkert | Zendy; Yuzuru Yoshii | Zendy

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The origin of galactic discs with exponential z-profiles

Author(s) -

Andreas Burkert,

Yuzuru Yoshii

Publication year - 1996

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/282.4.1349

Subject(s) - physics , astrophysics , exponential function , star formation , spiral galaxy , galactic plane , galaxy , gravitation , isothermal process , astronomy , thermodynamics , mathematical analysis , mathematics

A new solution is presented for the puzzling, observed universality of the exponential luminosity profiles, perpendicular to the disc planes of spiral and lenticular galaxies. It is shown that such exponential z-profiles result naturally from gaseous protodiscs which settle into isothermal equilibrium prior to star formation. Subsequent cooling leads to a gravitational contraction of the gas towar...

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