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We present ultraviolet integrated and azimuthally-averaged surfacephotometric properties of a sample of 44 dIm, BCD, and Sm galaxies measuredfrom archival NUV and FUV images obtained with GALEX. We compare the UV toHalpha and V-band properties and convert FUV, Halpha, and V-band luminositiesinto star formation rates (SFRs). We also model the star formation history fromcolors and compare the integrated SFRs and SFR profiles with radius for thesemethods. In most galaxies, the UV photometry extends beyond Halpha in radius,providing a better measure of the star formation activity in the outer disks.The Halpha appears to be lacking in the outer disk because of faintness in lowdensity gas. The FUV and V-band profiles are continuous with radius, althoughthey sometimes have a kink from a double exponential disk. There is no obviousdifference in star formation properties between the inner and outer disks. Nodisk edges have been observed, even to stellar surface densities as low as 0.1Msun/pc2 and star formation rates as low as 10^{-4} Msun/yr/kpc2. Galaxies withlow HI to luminosity ratios have relatively low FUV compared to V-band emissionin the outer parts, suggesting a cessation of star formation there. Galaxieswith relatively high HI apparently have fluctuating star formation with a Gyrtimescale.

GALEX Ultraviolet Imaging of Dwarf Galaxies and Star Formation