NOAO >   Observing Info >   Approved Programs >   2017A-0418

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Program Information for 2017A-0418


PI: Katherine L Rhode, Indiana U., krhode@indiana.edu
Address: Department of Astronomy, 727 E. Third Street, Bloomington, IN 47405 USA

CoI: William Janesh, Indiana U.
CoI: Hannah Pagel, Indiana U.
CoI: John J Salzer, Indiana U.
CoI: Elizabeth Adams, ASTRON
CoI: Martha Haynes, Cornell U.
CoI: Riccardo Giovanelli, Cornell U.
CoI: Luke Leisman, Cornell U.
CoI: John M Cannon, Macalester College
CoI: Steven Janowiecki, Univ. of Western Australia

Title: WIYN ODI Imaging of Ultra-Compact High Velocity Clouds and Almost-Dark Objects from ALFALFA

Abstract: We propose to obtain follow-up WIYN ODI imaging of objects discovered by the ALFALFA neutral hydrogen survey. The combination of ALFALFA $+$ WIYN allows us to probe the extreme low-mass end of the galaxy and HI mass functions and to investigate the complex interplay between low-mass dark matter halos, their baryonic components, and the gas and stellar processes that shape them. Most of the targets for this run are Ultra-Compact High Velocity Clouds (UCHVCs), which have kinematics and sizes that make them likely to be low-mass dwarf galaxies within the Local Group or its environs, but which have no optical counterpart in existing catalogs. The prototype UCHVC is Leo P, a gas- rich dwarf galaxy at 1.6 Mpc that is the lowest-mass star-forming galaxy known and was identified by following up an ALFALFA HI detection with WIYN. The remaining targets are ”Almost-Dark” galaxies, which also have no obvious optical counterpart but a wider range of possible distances than the UCHVCs. From our master list of UCHVCs and Almost- Dark sources, we have chosen 33 of the highest-priority objects to observe in 2017A in order to study the optical emission and stellar populations associated with these HI sources. We are requesting 8 ODI nights, with the goal of imaging $sim of the objects in our list in at least two filters in 2017A.

Program Type: ITAC

Scheduled Nights:
Run 1 (2017A):  WIYN/ODI -- 5n on Mar 24 - Mar 28 2017


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 >   2017A-0418

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