NOAO >   Observing Info >   Approved Programs >   2014B-0154

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Proposal Information for 2014B-0154


PI: Kathleen Eckert, University of North Carolina at Chapel Hill, keckert@physics.unc.edu
Address: Physics Department, CB 3255, Chapel Hill, NC 27599-3255, USA

CoI: Sheila Kannappan, University of North Carolina at Chapel Hill
CoI: Iraklis Konstantopoulos, Australian Astronomical Observatory
CoI: Millicent Maier, Australian Astronomical Observatory
CoI: Elaine Snyder, University of North Carolina at Chapel Hill
CoI: David Stark, University of North Carolina at Chapel Hill
CoI: Amanda Moffett, University of Western Australia
CoI: Andreas Berlind, Vanderbilt University
CoI: Erik Hoversten, University of North Carolina at Chapel Hill
CoI: Kirsten Hall, University of North Carolina at Chapel Hill
CoI: Jerry Sellwood, Rutgers University
CoI: Dara Norman, NOAO
CoI: Mark Norris, MPIA
CoI: David Guynn, University of North Carolina at Chapel Hill
CoI: Linda Watson, Harvard-Smithsonian Center for Astrophysics
CoI: the RESOLVE team

Title: Dynamical Masses of Gas-rich Dwarf Galaxies for the RESOLVE Velocity Function

Abstract: The RESOLVE (REsolved Spectroscopy Of a Local VolumE, \emphhttp://resolve.astro.unc.edu) survey is measuring the galaxy velocity function (proxy for the dynamical mass function) for >50,000 cubic Mpc of the z ~ 0 universe. The B-semester subvolume, an unusually complete sample overlapping the SDSS Stripe 82 footprint, is an approved NOAO survey program to be completed in 2014B with both NOAO and UNC guaranteed time. Of the galaxies still to be observed, 33 are low-mass, low-inclination galaxies that were originally slated for UNC time using SOAR's SIFS IFU, but it has been delayed in commissioning. We therefore request 4 nights of grey time to measure the H(alpha) kinematics of these galaxies with the KOALA IFU on the AAT. We need full velocity field information for these low-inclination galaxies to measure their deprojected rotation velocities. With baryonic masses down to ~10^8.6 M_\odot, these 33 galaxies are essential to construct the first velocity function for an environmentally diverse sample of galaxies complete to baryonic masses well into the dwarf regime where gas-dominated galaxies become common. While stellar and baryonic mass functions exhibit much flatter low mass slopes than predicted by theory, with the complete RESOLVE B-semester velocity function, we can measure the low mass slope of the \emphtotal mass function, and determine whether potential ``dark'' gas components resolve the discrepancy.


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