Computer Science
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..326d&link_type=abstract
NOAO Proposal ID #2006A-0326
Computer Science
Scientific paper
We propose to resolve the halo stellar populations of four nearby, massive disk galaxies (NGC 2403, M81, M83, and NGC 4244) using deep observations with MegaCam on the MMT and IMACS on Magellan-I. These observations will provide star counts and color-magnitude diagrams ~1.5 magnitudes below the tip of the Red Giant Branch (RGB) of the halos of each galaxy. We will measure the metallicity distribution functions and stellar density profiles from star counts down to very low average surface brightnesses, equivalent to ~29.5 V-magnitude per square arcsec. Our targets are part of our HST SNAP program and cover a range in galaxy mass, luminosity, and morphology. As function of these galaxy properties this survey will provide:
The first systematic study of the radial and isophotal shapes of diffuse stellar halos.
A comprehensive analysis of halo metallicity distributions as a function of galaxy type and position within the galaxy.
A sensitive search for tidal streams and halo substructure.
The first detailed comparative study of stellar populations across outer disk truncations.
We will use these fossil record of the galaxy assembly process locked up in the old stellar populations to test halo formation models within the hierarchical galaxy formation scheme.
Bell Eric
Bullock James
Courteau Stephane
Dalcanton Julianne
de Jong Roelof
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