NOAO >   Observing Info >   Approved Programs >   2016A-0290

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Program Information for 2016A-0290


PI: Beth Willman, U. of Arizona, bwillman@lsst.org
Address: 933 AVENUE, TUCSON, AZ 85721 USA

CoI: David Sand, Texas Technical University
CoI: Jonathan Hargis, Haverford College
CoI: Denija Crnojevic, Texas Technical University
CoI: Jay Strader, Michigan State U.
CoI: Kristine Spekkens, Royal Military College of Canada
CoI: Annika Peter, Ohio State U.
CoI: Robert Lupton, Princeton U.
CoI: Aaron Romanowsky, San Jose State U.
CoI: Jean Brodie, UC Santa Cruz
CoI: Duncan Forbes, Swinburne U.
CoI: Paul Price, Princeton U.
CoI: Evan Kirby, California Institute of Technology
CoI: Eric Bell, U. of Michigan

Title: The Stellar Halos and Dwarf Satellites of LMC-mass Analogs

Abstract: We propose to use two nights of Subaru/HSC to map the stellar halos and satellite populations of NGC 2403 (d ~ 3.2 Mpc, M_star ~ 7x10^9 M_Sun and NGC 40214 (d~3 Mpc, M_star ~ 1x10^9 M_Sun) with resolved red giant branch stars. These isolated galaxies have LMC-like stellar masses. Our observations will include most of their virial volumes and will deliver the first measure of the dwarf satellite populations and comprehensive stellar halo properties within isolated LMC-like environments. We expect to discover a total of ~8 dwarf satellites and measure their luminosities, sizes, stellar populations and spatial distributions. These will inform our understanding of the recent DES discoveries of dwarf satellites tentatively affiliated with the LMC/SMC system (Bechtol et al. 2015; Koposov et al. 2015). We will compare the stellar halos' observed properties with a suite of N-Body+SPH simulations to measure the relative importance of in-situ components and accreted components in LMC-mass stellar halos - a critical benchmark of the hierarchical model. The globular cluster censuses enabled by this program will be the most complete (in halo volume and cluster luminosity) possible from the ground, and will yield a complimentary measure of each galaxy's formation history.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2016A):  GEM-N/HSC -- 2n on Feb 09 - Feb 10 2016


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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