PI: Denija Crnojevic, Texas Technical University, firstname.lastname@example.org
CoI: David Sand, Texas Technical University
CoI: Marina Rejkuba, ESO
CoI: Gary Da Costa, Australian National U.
CoI: Stefano Pasetto, University College London
CoI: Eva Grebel, Astronomisches Rechen-Institute
CoI: Nelson Caldwell, Harvard-Smithsonian Center for Astrophysics
CoI: Puragra Guhathakurta, University of California Observatories
CoI: Anil Seth, University of Utah
CoI: Joshua Simon, Carnegie Observatories
CoI: Jay Strader, Michigan State U.
CoI: Elisa Toloba, University of California Observatories
Title: Environment and the evolution at low-mass galactic scales: clues from the Cen A group
Abstract: This proposal aims at ultimately obtaining quantitative constraints on the influence of environment on the star formation and evolution of low-mass satellites in the nearby (3.7 Mpc) Cen A group, dominated by an elliptical galaxy. Our proposed 22.1 h FLAMINGOS-2 survey of 12 objects with -8<M_V<-14 will allow us to determine the relative frequency and luminosity of their intermediate-age (~1-8 Gyr) luminous asymptotic giant branch (AGB) stars. Optical HST imaging is already available for our targets, but only near-IR observations can separate candidate AGB stars from foreground Galactic contaminants. We ultimately want to investigate the preliminary trend we found for 5 CenA satellites, where intermediate-age star formation is substantially lower than what is observed in Milky Way satellites of comparable luminosity (i.e. mass), suggesting environmental effects are key to galaxy evolution at these low-mass scales. The proposed program will allow the first derivation of accurate star formation histories for dwarfs as faint as M_V=-8 beyond the Local Group, and will represent a crucial step in providing observational constraints for future models of star formation at the lowest galactic masses.
Program Type: Standard/Extragalactic
Run 1 (2016A): GEM-SQ/Flamingos2 -- 22.1hrs band 2 (GS-2016A-Q-63)
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360