Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50816h&link_type=abstract
Spitzer Proposal ID #50816
Computer Science
Scientific paper
Extremely low-metallicity galaxies represent key objects to understand the chemical evolution of galaxies throughout the ages of the Universe. Spitzer observed so far an incomplete sample for which the metallicity distribution may not be representative of the actual situation in the Universe. We selected a complete sample of very metal-poor galaxies (leq 1/10 Zodot) from the SDSS DR5 survey. This sample will allow doubling the present sample of Spitzer observations of BCDs with comparable metallicities. The main goal of the proposal is to view the sample as a whole, and study the variation and distributions of their infrared properties. We will explore the effect of metallicity on the variation of these properties, particularly examine the possibility of a metallicity threshold for the formation of polycyclic aromatic hydrocarbons. We are also interested in the general properties and variations in the SED of these BCDs. The wealthy information from the SDSS survey will be implemented to the sample to understand the influence of the large-scale environment on the star-formation properties inferred from their infrared observations. The resulted dataset we can obtain will constitute a long-lasting resource for studies of metal-deficient galaxies. The whole observations are divided into one GO and one GTO proposals. The GTO proposal is focused on obtaining the IRS spectra of the sample, while the GO one is focused on the photometry of the sample. Thus they are each complete in its own.
Hao Lei
Houck Jim
Lebouteiller Vianney
Wu Yanling
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