Spitzer 4.5 µ Mass-Metallicity Relation for 25 Nearby Dwarf Galaxies

Details Spitzer 4.5 µ Mass-Metallicity Relation for 25 Nearby Dwarf Galaxies Spitzer 4.5 µ Mass-Metallicity Relation for 25 Nearby Dwarf Galaxies

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..381..169l&link_type=abstract

The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series, Vol. 381,

Astronomy and Astrophysics

Astronomy

Scientific paper

For a sample of 25 dwarf irregular galaxies with distances D ⪉ 5~Mpc and measured oxygen abundances, we report galaxy luminosities at 4.5 µ and stellar masses from near-infrared imaging with IRAC on the Spitzer Space Telescope. We have constructed the appropriate luminosity-metallicity (L--Z) and mass-metallicity (M--Z) relations, and compared these relations with their corresponding relations from the Sloan Digital Sky Survey (SDSS). We obtain the following results. 1. The dispersion in the near-infrared L--Z relation is reduced with respect to the dispersion in the optical L--Z relation, which agrees with expectations for reduced variations of stellar mass-to-light ratios at longer wavelengths compared to optical wavelengths. 2. The dispersion in the optical L--Z relation is similar over approximately 11~mag in optical luminosity. 3. With our constructed M--Z relation, we have extended the SDSS M--Z relation to lower masses by about 2.5~dex in stellar mass. 4. The dispersion in the M--Z relation appears to be comparable over a range of 5.5~dex in stellar mass.

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