Dust and Gas in Extremely Low-Metallicity Blue Compact Dwarf Galaxies

Details Dust and Gas in Extremely Low-Metallicity Blue Compact Dwarf Galaxies Dust and Gas in Extremely Low-Metallicity Blue Compact Dwarf Galaxies

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40335h&link_type=abstract

Spitzer Proposal ID #40335

Computer Science

Scientific paper

The power of Spitzer/IRS to penetrate dust and measure its emission has already changed how we view star-formation processes in metal-poor environments. Despite theoretical expectations, it appears that dust in metal-poor star-forming regions dominates the spectral energy distribution and can heavily obscure the optical light. Previous IRS GTO observations of blue compact dwarf galaxies (BCDs) have begun the data set needed to understand how dust affects star formation in low-metallicity environments and how dust grains themselves are created in metal-poor starbursts. Exploratory IRS GTO observations have been made of 61 BCDs, most only in peakup imaging mode, and of 26 observed spectroscopically, only 11 had adequate data for analysis. The current proposal will observe 7 extremely metal-poor BCDs which are sufficiently bright in the IR for full coverage with adequate S/N in all IRS modules. The new observations will be combined with those already in the Spitzer/IRS archive to achieve a comprehensive BCD sample with oxygen abundances ranging from 2% to 40% solar, and with several objects with good S/N in each metallicity bin. This will provide a greatly improved assessment of how star-formation properties of BCDs depend on metal abundance. We request 21.0 hrs in IRS AORs.

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