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The Lifecycle of Dust and Metals in Low-Abundance Galaxies

Published online by Cambridge University Press:  30 October 2019

Alec S. Hirschauer Open the ORCID record for Alec S. Hirschauer [Opens in a new window] ,
Laurin Gray ,
William Paranzino ,
Margaret Meixner ,
Martha L. Boyer Open the ORCID record for Martha L. Boyer [Opens in a new window]  and
Olivia C. Jones Open the ORCID record for Olivia C. Jones [Opens in a new window]
Alec S. Hirschauer
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: ahirschauer@stsci.edu
Laurin Gray
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: ahirschauer@stsci.edu Steward Observatory, University of Arizona, 933 N. Cherry Ave, Tucson, AZ 85721, USA
William Paranzino
Affiliation:
Department of Physics & Astronomy, Johns Hopkins University, 2400 N. Charles St., Baltimore, MD 21218, USA Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA
Margaret Meixner
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: ahirschauer@stsci.edu Department of Physics & Astronomy, Johns Hopkins University, 2400 N. Charles St., Baltimore, MD 21218, USA
Martha L. Boyer
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: ahirschauer@stsci.edu
Olivia C. Jones
Affiliation:
United Kingdom Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, UK
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Abstract

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The earliest generations of stars were produced in galaxies at high redshift. The physical conditions in which these stars formed, produced heavy elements and dust, and subsequently ended their life cycles, however, are vastly different from those in the Milky Way. Nearby low metal-abundance galaxies provide critical laboratories within which it is possible to observe conditions similar to those at high redshift, shedding light on the lifecycle of dust and metals in the early Universe. Does the process of star formation change at low metallicity? How did galaxies in the early Universe produce significant amounts of dust without the elapsed time necessary for stars to evolve to the asymptotic giant branch (AGB) phase and contribute via mass loss? Here we present work cataloging dust-producing sources in the nearby metal-poor galaxy NGC 6822 and outline forthcoming GTO observations of this system and the blue compact dwarf I Zw 18 with JWST.

Keywords

galaxies: dwarfgalaxies: irregulargalaxies: individual (NGC 6822)infrared: galaxiesinfrared: starsstars: AGB and post-AGB
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 201 - 203
Copyright
© International Astronomical Union 2019 

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