Mathematics – Logic
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19312202p&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #122.02; Bulletin of the American Astronomical Society, Vol. 31, p.664
Mathematics
Logic
Scientific paper
We present preliminary abundance gradient data for a sample of 21 low surface brightness (LSB) galaxies. The galaxies span a range of physical properties from dwarfs to several giant LSB galaxies where abundances are measured out to radii of greater then 20 kpc h-175. Except for three cases, most of the galaxies observed do not show any clearly observable abundance gradients with another four or so having perhaps slight gradients. This is consistent with the relations between abundance gradients and other galaxian properties found by Vila-Costas & Edmunds (1992, MNRAS, 259, 121) for galaxies of similar luminosities and similarly late morphological types. However, even the large and luminous galaxies such as UGC 6614 have flat abundance profiles. In fact, UGC 6614 is the most striking example where the derived abundances are constant and relatively high ((1)/(2) Zsun or greater) both near the center and in the very LSB outer disk at a radius of about 35 kpc h-175. It is not clear yet why the enrichment in the outer disk and center should be so similar in this case given the very different stellar and gas mass surface densities at those locations.
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