A galactic disk is not a true exponential

Details A galactic disk is not a true exponential A galactic disk is not a true exponential

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282...95s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 282, July 1, 1984, p. 95-100. Research supported by the Lewis and Betsy Ste

Astronomy and Astrophysics

Astrophysics

41

Disk Galaxies, Interstellar Gas, Stellar Evolution, Brightness, Density Distribution, Stochastic Processes

Scientific paper

Stochastic self-propagating star formation predicts that the distribution of atomic hydrogen in a galactic disk should be relatively independent of radius. The molecular hydrogen density should therefore vary as the total gas density minus a constant. The most likely distribution for the total gas density is approximately 1/r, the same as the distribution of column density in a halo that produces a flat rotation curve. The authors propose that the approximately exponential surface brightness distribution observed in disk galaxies results from the intrinsic r-1-constant distribution produced by propagating star formation. The exponential fit has no intrinsic physical meaning.

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