Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20516901l&link_type=abstract
American Astronomical Society Meeting 205, #169.01; Bulletin of the American Astronomical Society, Vol. 36, p.1622
Astronomy and Astrophysics
Astronomy
Scientific paper
Dwarf irregular galaxies display a correlation between metallicity and total luminosity. It is possible that this relationship arises from mass loss due to galactic winds. However, the relationship at optical wavelengths shows a large dispersion, and part of the dispersion may be due to variations in luminosity caused by variations in the star formation rate. Infrared luminosities are less affected by changes in the star formation rate, so it is of interest to study the infrared luminosity-metallicity relationship. We present new 4.5 μ m luminosities for nearby dwarf irregular galaxies observed under the Spitzer GTO program #128 (P. I. R. Gehrz). For the first time, we construct an infrared luminosity-metallicity relationship for dwarf irregular galaxies. E. D. S. and H. L. acknowledge partial support from a NASA LTSARP grant NAG 5--9221 and from the University of Minnesota. Support for this work was provided by NASA through contract #1256406 issued to R. D. G. by JPL/Caltech.
Gehrz Robert D.
Jackson Dale C.
Lee Hyunyoung
Polomski Elisha
Skillman Evan D.
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