NOAO >   Observing Info >   Approved Programs >   2017A-0122

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Program Information for 2017A-0122


PI: Jeffrey Carlin, LSST, jcarlin@lsst.org
Address: 933 N CHERRY AVE, TUCSON, AZ 85721 USA

CoI: Denija Crnojevic, Texas Technical University
CoI: Beth Willman, LSST
CoI: David Sand, Texas Technical University
CoI: Jay Strader, Michigan State U.
CoI: Aaron Romanowsky, San Jose State U.
CoI: Kristine Spekkens, Royal Military College of Canada,
CoI: Annika Peter, Ohio State U.
CoI: Jonathan Hargis, STScI
CoI: Jean Brodie, UC Santa Cruz
CoI: Duncan Forbes, Swinburne U.
CoI: Greg Dooley, MIT

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 4214 (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 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 ~2-8 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 complimentary measure of each galaxy's formation history.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2017A):  GEM-N/HSC -- 2n on Feb 27 - Feb 28 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-0122

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