Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21910601h&link_type=abstract
American Astronomical Society, AAS Meeting #219, #106.01
Astronomy and Astrophysics
Astronomy
Scientific paper
We have assembled a multi-wavelength dataset on 41 relatively normal, nearby (<10 Mpc) gas-rich dwarf irregular galaxies for the purpose of determining the drivers for star formation in these systems. This project is called LITTLE THINGS (Local Irregulars That Trace Luminosity Extremes, The HI Nearby Galaxy Survey). Our data include GALEX UV images, ground-based UBV and Halpha images, some ground-based JHK images, Spitzer archival mid-IR images, and HI-line maps. The HI maps, obtained with the VLA, go deep (12/6/2 hrs in B/C/D arrays) and are characterized by high spectral resolution (=2.6 km/s) and high angular resolution (typically 6", which is 110 pc at the average distance of our sample). Our datasets trace the stellar populations, gas content and structure, dynamics, and star formation indicators in the galaxies, and are being used to answer the following questions: What regulates star formation in small, gas-rich galaxies? What is the relative importance of sequential triggering for star formation in dwarf galaxies? What is the relative importance of triggering of star formation by random turbulent compression in dwarf galaxies? What happens to the star formation process in the outer parts of disks? What happens to the star formation process at breaks in the exponential light profiles? And, what happens in Blue Compact Dwarf galaxies?
The LITTLE THINGS team is grateful to the National Science Foundation for funding through grants AST-0707563, AST-0707426, AST-0707468, and AST-0707835 to DAH, BGE, CES, and LMY.
Hunter Deidre Ann
Little Things Team
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