Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916707l&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #167.07; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
Ultra-violet photometry is added to a multi-wavelength investigation of star formation in dwarf irregular (dIm) galaxies. We obtained FUV (1516 Angstrom) and NUV (2267 Angstrom) images of 13 dIm galaxies from the GALEX (Galaxy Evolution Explorer) satellite archives, and combined them with UBVJHK and Halpha images. Halpha may not be an effective tracer of recent star formation in the outer parts of galaxies, but UV photometry has the potential to trace star formation to large radii. We found that the UV does reveal recent star formation beyond where Halpha nebular emission ends in about half of the galaxies. The UV colors are consistent with star formation in the outer parts of these galaxies being either constant or having occurred in 10-200 Myr old bursts. Surface brightness profiles show that the UV light decreases in brightness faster with radius than visual light in most of the galaxies, suggesting that the density of the young stars drops off faster than that of the older stars.
BCL would like to thank the 2006 Research Experiences for Undergraduates program at Northern Arizona University which is funded by the National Science Foundation under grant AST-0453611.
Hunter Deidre
Ludka Bonnie C.
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