NOAO >   Observing Info >   Approved Programs >   2016A-0068

Small NOAO Logo

Program Information for 2016A-0068


PI: Thomas Deboer, University of Cambridge, tdeboer@ast.cam.ac.uk
Address: Institute of Astronomy, Madingley Road, Cambridge, Cambridgeshire CB3 0HA United Kingdom

CoI: Vasily Belokurov, University of Cambridge
CoI: Sergey Koposov, University of Cambridge
CoI: Denis Erkal, University of Cambridge

Title: Mapping the star formation of the Sagittarius dwarf galaxy and stream

Abstract: Stellar streams provide dramatic confirmation that large systems accrete smaller systems, in the context of a hierarchical merging cosmology, and therefore contain important clues about the formation mechanism of the Galactic halo. By studying the detailed spatial properties of the galaxy-stream interface we can determine how stars are stripped from their hosts due to the Galactic tidal field and how the formation of the Galactic halo may have proceeded. \ Here we propose to use deep, wide-field photometry to trace the cover the main body of the Sgr dwarf galaxy and the galaxy-stream interface region. We will determine deep, MW decontaminated CMD across the face of Sgr, allowing us to determine the accurate star formation history of a system at the upper end of the dwarf galaxy mass range. Comparison between the stellar populations present within the surviving main body and the streams will allow us to piece together the stripping history of the system and determine when and from where each piece of stream was stripped. Furthermore, Analysis of the accurate spatial information in the stream-galaxy interface region will allow us to determine the detailed morphology and stellar population mix of the region were stars are stripped from their host, providing valuable constraints on satellite disruption modelling.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2016A):  CT-4m/DECam -- 2.5n on Jun 30 - Jul 02 2016


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 >   2016A-0068

noaoprop-help@noao.edu

Small NOAO Logo