Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..13e...1n&link_type=abstract
Exploiting Large Surveys for Galactic Astronomy, 26th meeting of the IAU, Joint Discussion 13, 22-23 August 2006, Prague, Czech
Astronomy and Astrophysics
Astronomy
Scientific paper
Recently, the 2MASS, SDSS and SDSS II surveys have been used to discover and quantify Milky Way substructure from stellar densities, including new dwarf galaxies and tidal debris in the spheroid and new measurements of the disk scale height(s). These studies, which make use of large sky coverage and millions of stars, make it possible to see the forest for the trees, and illustrate how important it is to know the global properties of a stellar component before fitting model parameters. I will highlight some of the results from these surveys. To date, advances have resulted primarily from new visualizations of the data. The long-term goal is to produce a model consisting of a set of stellar components with population descriptions that match the observations. One would like to construct a model by selecting stars from one component at a time, constructing a population model for it, and then fitting global parameters. This is difficult when the number of components is unknown, each component consists of a range of stellar populations, substructure exists on even the largest scales, and the density model for each component is not well constrained.
Jo Newberg Heidi
SEGUE Collaboration
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