Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.4902b&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #49.02; Bulletin of the American Astronomical Society, Vol. 24, p.808
Astronomy and Astrophysics
Astronomy
Scientific paper
Freeman (1970, Ap.J., 160, p. 811) defined a Type II spiral galaxy brightness profile as one in which the inward extrapolation of the disk brightness distribution at some point becomes brighter than the observed brightness profile; this indicates a lack of disk light at small radii. There are three possible mechanisms to explain such behavior: 1) no stars were formed near the center of the disk, 2) stars have been removed from the center of the disk, or 3) the stars are present but cannot be seen. As a first step toward sorting between these hypotheses, we have collected an inhomogeneous sample of 167 brightness profiles from the literature and used it to determine how frequently these disk types occur. We classified each brightness profile as to the disk type based on a visual inspection of the published profile, except those from Freeman (1970), whose classifications were accepted without question. The initial results of our study will be presented, with some interpretation as to the relationship with the three hypotheses on the origin of such disks. Our study will be continued by the specification of a better-defined galaxy sample and a homogeneous source of brightness profiles. In addition, we are locating rotation curves for as many galaxies as possible to check for correlations with rotation curve characteristics.
Anderson Kurt S. J.
Baggett Sylvia Marie
Baggett Wayne E.
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