Computer Science
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..374..281h&link_type=abstract
From Stars to Galaxies: Building the Pieces to Build Up the Universe. ASP Conference Series, Vol. 374, proceedings of the confer
Computer Science
1
Scientific paper
We are quantifying the kinematics of the stellar populations (thin disk, thick disk and halo) of the nearby spiral galaxy M33. Photometry from tet{hoo_ferg06} shows M33's inner region is well-fit by a single exponential disk with a scale length of 0.1° (1.4 kpc) out to a radius of 0.6°, although individual stars observed well outside a radius of 1.0° are potential members of a thick disk or halo. We are using the DEIMOS spectrograph at the Keck II 10-meter telescope to obtain spectra surrounding the CaII near-infrared triplet lines for ˜1000 individual red giant stars throughout M33. We derived radial velocities for 331 stars to date from five fields along the major and minor axes of the galaxy, with typical 1-σ random errors of 10 km/s. Of these stars, 234 are probable M33 red giants rather than foreground Milky Way dwarfs based on our photometric observations made in the narrow-band DDO51 filter. In addition to a thin disk with a velocity dispersion of 15 km/s around the HI disk, we also see a component with a large velocity dispersion of 47 km/s. This dispersion is much larger than the 17 km/s dispersion seen in young disk clusters tep{hoo_chan02} and the 9 km/s dispersion found in the HI disk tep{hoo_warner73}, suggesting the existence of a thick disk and stellar halo that make up 30% and 4% of the total number of stars in these fields, respectively.
Ferguson Annette Mairi Nelson
Hood M.
Irwin Mary Jane
Smecker-Hane Tammy
Teig Matthew
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