Spitzer 4.5 micron Luminosity-Metallicity and Mass-Metallicity Relations for Nearby Dwarf Irregular Galaxies

R D Gehrz; H Lee; C E Woodward; E Polomski; J M Cannon; E D Skillman; D C Jackson

doi:10.1007/978-3-540-71173-5_30

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Spitzer 4.5 micron Luminosity-Metallicity and Mass-Metallicity Relations for Nearby Dwarf Irregular Galaxies

R D Gehrz, H Lee, C E Woodward, E Polomski, J M Cannon, E D Skillman and D C Jackson

Groups of Galaxies in the Nearby Universe: Proceedings of the ESO Workshop held at Santiago de Chile, December 5 - 9, 2005

ESO Astrophysics Symposia

03/27/2006

DOI: 10.1007/978-3-540-71173-5_30

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https://arxiv.org/pdf/astro-ph/0603739View

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Abstract

For a sample of 25 dwarf irregular galaxies with distances D < 5 Mpc and measured oxygen abundances, we present results derived from stellar masses and galaxy luminosities 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.

Astrophysics and Astronomy

Details

Title: Subtitle: Spitzer 4.5 micron Luminosity-Metallicity and Mass-Metallicity Relations for Nearby Dwarf Irregular Galaxies
Creators: R D Gehrz - University of Minnesota
H Lee - University of Minnesota
C E Woodward - University of Minnesota
E Polomski - University of Minnesota
J M Cannon - Max Planck Institute for Astronomy
E D Skillman - University of Minnesota
D C Jackson - University of Minnesota
Resource Type: Conference proceeding
Publication Details: Groups of Galaxies in the Nearby Universe: Proceedings of the ESO Workshop held at Santiago de Chile, December 5 - 9, 2005
Series: ESO Astrophysics Symposia
DOI: 10.1007/978-3-540-71173-5_30
Language: English
Date published: 03/27/2006
Academic Unit: Physics and Astronomy
Record Identifier: 9984627303902771

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