Abstract
view Abstract Citations (44) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A galactic disk is not a true exponential Seiden, P. E. ; Schulman, L. S. ; Elmegreen, B. G. Abstract 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. Publication: The Astrophysical Journal Pub Date: July 1984 DOI: 10.1086/162179 Bibcode: 1984ApJ...282...95S Keywords: Disk Galaxies; Interstellar Gas; Stellar Evolution; Brightness; Density Distribution; Stochastic Processes; Astrophysics full text sources ADS |
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