[40.06] Stellar and Gas Content of Dwarf and Low Surface Brightness Galaxies

AAS 202nd Meeting, May 2003
Session 40 Galaxies
Poster, Wednesday, May 28, 2003, 10:00am-6:45pm, West Exhibit Hall

[40.06] Stellar and Gas Content of Dwarf and Low Surface Brightness Galaxies

A. C. Schwortz, S. E. Schneider (UMass-Amherst)

Out of a target list of 1845 dwarf and low surface brightness (LSB) galaxies drawn from the Uppsala General Catalog (UGC) of galaxies, 1247 are detected in the 2-Micron All Sky Survey (2MASS). We combine data from the J-band Version 2 and 3 extended source catalogs. These data are compared with existing HI data to determine general properties of dwarf and LSB galaxies as compared to ``normal" high surface brightness galaxies. The 2MASS-detected sample possesses J-band angular radii from 7'' to nearly 1', apparent magnitudes of 10 to 14, and J-band surface brightnesses (\mu_J) from 18 to 23 mag/arcsec². The distances of these sources ranges from 2 to 100Mpc, and thus many of the high-redshift sources actually have high luminosities and masses even though they are morphologically classified as dwarfs. Our sample possesses J-band luminosites and of 10⁶-10¹¹L_J,\sun, and M_HI=10⁶-10¹¹M_\sun, with a "star-to-gas" ratio ranging over -2 < log(M_HI/L_J) < 2, in solar units. Within the various late-type morphological classifications drawn from the UGC, we find three categories based on the physical properties of the galaxies.

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The author(s) of this abstract have provided an email address for comments about the abstract: andriaschwortz@yahoo.com

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