The Shape and Profile of the Galactic Halo as Seen by CFHT LS/b

Details The Shape and Profile of the Galactic Halo as Seen by CFHT LS/b The Shape and Profile of the Galactic Halo as Seen by CFHT LS/b

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724109s&link_type=abstract

American Astronomical Society, AAS Meeting #217, #241.09; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

One of the key goals of Galactic structure studies is to map the distribution of stars in the Galaxy. We use Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) data, recalibrated and transformed to the Sloan Digital Sky Survey ugri photometric system, to study the distribution of near-turnoff main sequence stars in the Galactic halo along four lines of sight and to distances of 35 kpc from the Sun. We find that the halo number density profile becomes steeper at Galactocentric distances greater than Rgal 28 kpc, with the power law index changing from ninner = -2.6 to nouter = -3.8. The oblateness of the halo is q = 0.70 and shows no evidence of change across the range of probed distances. The Sagittarius stream is detected in the l = 173 deg and b = -62 deg direction as an overdensity of [Fe/H] -1.5 dex stars at Rgal 32 kpc, and provides a new constraint for the Sagittarius stream and dark matter halo models. The Monoceros stream is also detected, as an overdensity of [Fe/H] > -1.5 dex stars in the l=232 deg and b = 26 deg direction with Rgal < 25 kpc. In two sightlines where we do not detect significant substructure, the median metallicity is found to be independent of distance within systematic uncertainties ([Fe/H] -1.5 with 0.2 dex of uncertainty).

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