Other
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.3907p&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #39.07; Bulletin of the American Astronomical Society, Vol. 27, p.868
Other
3
Scientific paper
Some of the largest galaxies known belong to the so-called ``Malin-type'' class of galaxies. Like their prototype, Malin 1 (Impey & Bothun 1989), these galaxies have large scale lengths (>10 kpc, H0 = 100 km s(-1) Mpc(-1) ), low central surface brightnesses, and generally large HI masses (> 10(10) Msun). Previous studies of chemical abundances of LSB galaxies (e.g. McGaugh 1994) have found them to have generally low metallicities (Z < (1)/(3)Zsun). However, only a couple galaxies in this sample have scale lengths of greater than 10 kpc. The APM survey for LSB galaxies (Impey et al. 1995) has turned up 10 more Malin-type galaxies as defined by a ``diffuseness index'' mu_ {B} + 5 log alpha (-1) > 27.0 (Sprayberry et al. 1995). We present preliminary results from a program to study the chemical abundances in these galaxies via spectroscopy of H II regions. Preliminary analysis has found that some of these galaxies have fairly high metallicities with Z =~ Zsun or more. This is somewhat surprising since these galaxies seem otherwise rather unevolved. Along with other evidence, this seems to imply that these galaxies have undergone previous episodes of star formation or have been slowly forming stars for some time.
Impey Chris David
Pickering Timothy E.
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