NOAO >   Observing Info >   Approved Programs >   2013A-0106

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Proposal Information for 2013A-0106


PI: Joseph Ward Moody, Brigham Young University, jmoody@byu.edu
Address: Physics Department, N484 ESC, Provo, UT 84602, USA

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

Title: Dwarf Galaxies In and Behind Void FN8

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 cannot be in void centers while others say they can. Dwarf galaxies have been identified inside a small, nearby void. However, the completeness limits of the major magnitude-limited surveys are still 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 a redshifted H(alpha) imaging survey for dwarf galaxies with -14.0 <=M_r <=-12.0 in 40 fields in the heart and back of the void ``FN8''. Finding no H(alpha) emitters in the heart will constrain 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. The dwarf galaxies we find behind FN8 will additionally determine the galaxy LMF to M_r=-12.0 in volumes away from clusters.


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NOAO >   Observing Info >   Approved Programs >   2013A-0106

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