NOAO >   Observing Info >   Approved Programs >   2006B-0013

Small NOAO Logo

Program Information for 2006B-0013


PI: Abhijit Saha, NOAO, saha@noao.edu
Address: NTSS, 950 N Cherry Ave, PO Box 26732, Tucson, AZ 85726-6732 USA

CoI: Edward W Olszewski, U. of Arizona
CoI: R Chris Smith, CTIO
CoI: Annapurni Subramaniam, Indian Institute of Astrophysics
CoI: Andrew Dolphin, U. of Arizona
CoI: Nicholas B Suntzeff, Texas A&M U.
CoI: Armin Rest, CTIO
CoI: Patrick Seitzer, U. of Michigan
CoI: Jason Harris, U. of Arizona
CoI: Dante Minniti, Pontificia Universidad Catolica de Chile
CoI: Kem Cook, Lawrence Livermore National Laboratory
CoI: Knut Olsen, CTIO
CoI: Patricia Knezek, WIYN

Title: The Outer Limits Survey: Stellar Populations at the Extremities of the Magellanic Clouds

Abstract: Knowledge of the distribution and population characteristics in outlying regions of the LMC/SMC complex is essential for understanding the early history of these objects and their place in the $\Lambda$CDM heirarchy. Past studies have either been very localized albeit detailed (e.g. deep HST population studies); or panoramic, but only identifying brighter objects. The latter limits not only what we can learn about the ages and abundances, but also how far out we can trace the structures, since small numbers of bright Cloud stars are overwhelmed by foreground stars from the Galaxy well before the estimated tidal radii are reached. We propose a survey that addresses this information gap by reaching 1.5 mag deeper than the oldest Main Sequence (MS) turnoff stars. Well chosen passbands ($R,I$ and Washington $C,M,DDO51$) provide ages and abundances. Using MS stars, we can measure the stellar distribution free of population bias beyond the expected tidal radius, out to 15$^\circ$ from either galaxy. While we cannot image the full $\sim 800$ square degrees of the region of interest, our chosen fields allow several important questions to be attacked. The survey will also identify stars that can be used later as kinematic probes of the dark matter surrounding the LMC and SMC, and their role within the Galactic halo.

Program Type: Survey

Scheduled Nights:
Run 1 (2006B):  CT-4m/MOSAIC -- 10n on Aug 15 - Aug 19 2006, Sep 15 2006, Oct 12 2006, Oct 14 2006, Oct 16 2006, Oct 18 2006, Oct 20 2006, Oct 22 2006, Oct 24 2006, Oct 26 2006, Nov 15 2006, Nov 17 2006, Nov 19 2006, Nov 21 2006, Nov 23 2006, Nov 25 2006
Run 1 (2007A):  CT-4m/MOSAIC -- 5n on Feb 17 - Feb 21 2007
Run 1 (2007B):  CT-4m/MOSAIC -- 5n on Jan 02 - Jan 07 2008
Run 1 (2008B):  CT-4m/MOSAIC -- 10n on Oct 21 - Oct 24 2008, Dec 21 - Dec 26 2008
Run 2 (2006B):  CT-0.9m/CFIM -- 8n on Aug 17 - Aug 21 2006, Jan 18 - Jan 20 2007
Run 2 (2007B):  CT-0.9m/CFIM -- 4n on Oct 11 - Oct 14 2007
Run 2 (2008B):  CT-0.9m/CFIM -- 3n on Dec 18 - Dec 20 2008
Run 2 (2009B):  CT-0.9m/CFIM -- 4n on Dec 17 - Dec 20 2009
Run 3 (2007A):  CT-0.9m-PRE/CFIM -- 30hrs


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 >   2006B-0013

noaoprop-help@noao.edu

Small NOAO Logo