NOAO >   Observing Info >   Approved Programs >   2017B-0816

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Program Information for 2017B-0816


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: Nick Smith, Indiana U.

Title: WIYN ODI Imaging of Ultra-Compact High Velocity Clouds, Almost-Dark Galaxies, and Andromeda Satellite Galaxies

Abstract: We propose to obtain follow-up WIYN ODI imaging of objects discovered by the ALFALFA neutral hydrogen survey. Our goal is to detect and study the optical emission and stellar populations associated with two types of ALFALFA sources: Ultra-Compact High Velocity Clouds (UCHVCs), which are HI clouds with properties that make them good candidates for nearby low-mass galaxies, and “Almost-Dark” galaxies, HI sources with a wider range of possible distances and masses. Both classes of objects have no clear optical counterpart in existing catalogs. We will use the WIYN ODI data to investigate the nature of these objects and to study how star formation and galaxy evolution proceed in galaxies that occupy the extreme end of the HI mass to optical luminosity regime. From our master list of Almost-Darks and UCHVCs, we have chosen 12 objects that have either not yet been observed in previous semesters, or were observed under poor seeing conditions. In addition to the ALFALFA sources, we plan to obtain deep imaging of four Andromeda satellite galaxies, as part of a larger study of the stellar populations, metallicity distributions, and structural properties of Local Group dwarf galaxies. In total, we are requesting 5 ODI nights in 2017B to image these 16 objects to sufficient depth in at least two filters.

Program Type: ITAC

Scheduled Nights:
Run 1 (2017B):  WIYN/ODI -- 5n on Sep 17 - Sep 21 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 >   2017B-0816

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