Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-01-02
Astron.Astrophys.313:45-64,1996
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astronomy & Astrophysics 21 pages LaTeX, 45 PostScript figures, also available at http://star-ww
Scientific paper
The statistics of the fundamental bulge and disk parameters of galaxies and their relation to the Hubble sequence were investigated by an analysis of optical and near-infrared observations of 86 face-on spiral galaxies. The availability of near-infrared K-passband data made it possible for the first time to trace fundamental parameters related to the luminous mass while hardly being hampered by the effects of dust and stellar populations. The observed number frequency of galaxies was corrected for selection effects to calculate volume number densities of galaxies with respect to their fundamental parameters. The main conclusions of this investigation are: 1) Freeman's law has to be redefined. There is no single preferred value for the central surface brightnesses of disks in galaxies. There is only an upper limit to the central surface brightnesses of disks, while for lower central surface brightnesses the number of galaxies per volume element decreases only slowly as function of the central surface brightness. 2) The Hubble sequence type index correlates strongly with the effective surface brightness of the bulge, much better than with the bulge-to-disk ratio. 3) The disk and bulge scalelengths are correlated. 4) These scalelengths are not correlated with Hubble type. Hubble type is a lengthscale-free parameter and each type therefore comes in a range of magnitudes (and presumably a range of total masses). 5) Low surface brightness spiral galaxies are not a separate class of galaxies. In a number of aspects they are a continuation of a trend defined by the high surface brightness galaxies. Low surface brightness galaxies are in general of late Hubble type.
No associations
LandOfFree
Near-infrared and optical broadband surface photometry of 86 face-on disk dominated galaxies. III. The statistics of disk and bulge parameters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Near-infrared and optical broadband surface photometry of 86 face-on disk dominated galaxies. III. The statistics of disk and bulge parameters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Near-infrared and optical broadband surface photometry of 86 face-on disk dominated galaxies. III. The statistics of disk and bulge parameters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-118203