NOAO >   Observing Info >   Approved Programs >   2014B-0178

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Proposal Information for 2014B-0178


PI: Joseph Ward Moody, Brigham Young University, jmoody@byu.edu
Address: Physics Department, N484 ESC, Provo, UT 84624, USA

CoI: Chris Draper, Brigham Young University
CoI: Michael D Joner, Brigham Young University

Title: Dwarf Galaxies Within Void FN2

Abstract: The dwarf galaxy population in low density volumes is a test of galaxy formation models and how they treat dark matter; some models say dwarf galaxies can be in void centers while others say they cannot. All extensive magnitude-limited surveys published to date have completeness limits that are too bright to say anything about the theoretically interesting dwarf galaxies with M_r fainter than -14 in the center of larger, well-defined voids. We propose to conduct such a survey using redshifted H(alpha) imaging for dwarf galaxies with -14.0 < M_r < -12.0 in the void ``FN2''. Finding no H(alpha) emitters in the heart constrains the population there to be less than 2 to 8% of the mean. Conversely, finding even one H(alpha) emitter in the void heart will be a significant challenge to several otherwise successful theories. Either result will be a significant step in better understanding galaxy formation and large-scale structure. We started this survey by examining void FN8 in February 2013. These data verified our survey technique but poor weather prevented us from obtaining a large data set. We are seeking to survey through FN2 to compile a statistically significant sample when combined with the limited 2013 results.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2014B-0178

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