The Galactic Structure and Stellar Population in the CFHTLS Wide Fields

Details The Galactic Structure and Stellar Population in the CFHTLS Wide Fields The Galactic Structure and Stellar Population in the CFHTLS Wide Fields

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..446..169x&link_type=abstract

Galaxy evolution: Infrared to millimeter wavelength perspective. Proceedings of a conference held at Guilin, China 25-29 October

Astronomy and Astrophysics

Astronomy

Scientific paper

Using the star counts from the CFHTLS (Canada-France-Hawaii Telescope Legacy Survey) release T0005, we individually investigate the Milky Way structure in each of the four wide fields. Both for the thin- and thick-disk, we adopt a double exponential model and fit the stars with g'-r' > 1.0 to determine their scale heights. The best-fittings give a similar thin-disk model of the scale heights H1˜220 pc in all fields. The scale heights of the thick-disk are about 700 pc in all fields. The local space number density normalization of the thick-disk is 6.2% - 11.9% of the thin disk. Given the binary fraction ƒm = 35%, the corrected scale heights of the thin- and thick-disk and the thick-to-thin disk density normalization is 260 pc, 860 pc and 10%, respectively. For the halo, the stellar density distribution is modeled as a power law. We fixed the disk parameters and estimate the structure of stellar halo based on all stars in each wide field. The results give a sharp (large power index: n>2.8) and round (large axial ratio: c/a > 0.8) halo. We find that it is difficulty to well constrain the stellar halo by a single power law, and a “dual-halo” model is needed to describe the density distribution of the stellar halo.

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