NOAO >   Observing Info >   Approved Programs >   2017A-0312

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Program Information for 2017A-0312


PI: Adam Smercina, U. of Michigan, asmerci@umich.edu
Address: Department of Astronomy, 1085 S UNIVERSITY AVENUE, ANN ARBOR, MI 48109-1107 USA

CoI: Eric Bell, U. of Michigan
CoI: Antonela Monachesi, MPA
CoI: Richard D'Souza, U. of Michigan
CoI: Jeremy Bailin, University of Alabama
CoI: David Nidever, NOAO
CoI: Colin Slater, U. of Washington
CoI: Paul Price, Princeton U.

Title: Revealing the Stellar Halo and Dwarf Satellites of M94

Abstract: The stellar halos and satellite populations of galaxies are crucial probes of their assembly. Nearby Milky Way-mass spirals exhibit a high level of diversity in their observed stellar halo properties, directly implying a variety of assembly histories. We propose a carefully-designed, deep Subaru Hyper Suprime-Cam gri imaging survey - building off of a successful survey of the stellar halos of M81 and M83 - to resolve the stellar populations of the large spiral galaxy M94. M94 hosts one of the largest known pseudobulges (~50% of its stellar mass), implying a possibly unique growth history. We will measure the mass, profile shape, substructure, and axis ratio of its completely unstudied stellar halo, and uncover, for the first time, its satellite galaxy population. In two nights, we will survey ~1/2 of M94’s stellar halo out to a distance of 120kpc, measure any substructure, and discover all M_V < -6 dwarf satellites in our target footprint (6+ are expected, given the dwarf populations of M81, the Milky Way, and M31). We will carefully compare M94's stellar halo with models of stellar halo formation in a cosmological context, revealing the most dominant events in its accretion history that resulted in its unique current morphology.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2017A):  GEM-N/HSC -- 2n on Apr 20 - Apr 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 >   2017A-0312

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