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Title:
Infrared Properties of Low-Metallicity Galaxies
Authors:
Engelbracht, C. W.; Gordon, K. D.; Misselt, K.; Smith, J. D. T.; Pérez-González, P. G.; Rieke, G. H.; Werner, M. W.; Vanzi, L.; Brandl, B. R.
Publication:
The Spitzer Space Telescope: New Views of the Cosmos ASP Conference Series, Volume 357, proceedings of the conference held 9-12 November, 2004 in Pasadena, California, USA. Edited by L. Armus and W.T. Reach. San Francisco: Astronomical Society of the Pacific, 2006., p.215
Publication Date:
12/2006
Origin:
ASP
Bibliographic Code:
2006ASPC..357..215E

Abstract

We present new Spitzer photometry of three low-metallicity galaxies. These galaxies have metallicities more than 30 times lower than the solar value and include the two galaxies with the lowest known metallicities, I Zw 18 and SBS 0335-52. Our IRAC and MIPS data represent the first mid- to far-infrared detections for most of these galaxies and allow us for the first time to explore the range of infrared properties of extremely low metallicity galaxies as a class. We derive dust temperatures, dust masses, and optical/infrared luminosities of the galaxies. To put our sample of low-metallicity galaxies into context, we use infrared colors and spectra of galaxies over the full range of metallicities observed in local galaxies to show that there is a transition metallicity below which PAHs are not observed in galaxies.

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