PI: Jeffrey Carlin, LSST, email@example.com
Address: 950 N CHERRY AVE, TUCSON, AZ 85719 USA
CoI: Denija Crnojevic, Texas Technical University
CoI: Beth Willman, LSST
CoI: David Sand, Texas Technical University
CoI: Jean Brodie, UC Santa Cruz
CoI: Duncan Forbes, Swinburne U.
CoI: Jonathan Hargis, STScI
CoI: Ricardo Munoz, Universidad de Chile
CoI: Annika Peter, Ohio State U.
CoI: Aaron Romanowsky, San Jose State U.
CoI: Kristine Spekkens, Royal Military College of Canada
CoI: Jay Strader, Michigan State U.
Title: The Stellar Halos and Dwarf Satellites of LMC-mass Analogs
Abstract: We propose to use two nights with 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 247 (D~3.7 Mpc, M_star ~ 3x10^9 M_Sun) with resolved red giant branch stars. These isolated galaxies have LMC-like stellar masses. Our observations will comprehensively map nearly their entire virial volumes and will deliver the first measure of the dwarf satellite populations and stellar halo properties within isolated LMC-like environments. We expect to discover a total of ~6-14 dwarf satellites and measure their luminosities, sizes, stellar populations and spatial distributions. We will compare these to models of galaxy formation to assess the predictions of satellite populations at the low-mass end of the galaxy hierarchy. Our discovered dwarf galaxies will inform our understanding of the recent DES discoveries of dwarf satellites tentatively affiliated with the LMC/SMC system. 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 complementary measure of each galaxy's formation history.
Program Type: Standard/Extragalactic
Run 1 (2017B): GEM-N/HSC -- 2n on Dec 23 - Dec 24 2017
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360