NOAO >   Observing Info >   Approved Programs >   2015B-0811

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Program Information for 2015B-0811


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: Steven Janowiecki, Indiana U.
CoI: John J Salzer, Indiana U.
CoI: Elizabeth Adams, Cornell U.
CoI: Martha Haynes, Cornell U.
CoI: Riccardo Giovanelli, Cornell U.
CoI: John M Cannon, Macalester College

Title: WIYN ODI Imaging of Ultra-Compact High Velocity Clouds and Other ALFALFA- Selected Targets

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. The UCHVCs have no optical counterpart in existing catalogs and may or may not have an associated stellar population. The prototype UCHVC is Leo~P, a gas-rich dwarf galaxy at 1.7 Mpc that is the lowest-mass star-forming galaxy known and was identified by following up an ALFALFA HI detection with WIYN imaging. The other targets for this run are "Almost Dark" galaxies, ALFALFA sources that also have no optical counterpart but a wider range of possible distances than the UCHVCs, and SHIELD galaxies, extreme low- mass, gas-rich, star-forming galaxies at distances of $\sim$5$-$12 Mpc. We have compiled a list of 22 objects that need WIYN imaging and we request five nights of ODI time to image them to sufficient depth in at least two filters.

Program Type: ITAC

Scheduled Nights:
Run 1 (2015B):  WIYN/ODI -- 5.5n on Oct 07 - Oct 11 2015, Dec 20 2015


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 >   2015B-0811

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