Kinematics of the Stellar Populations of M33

Details Kinematics of the Stellar Populations of M33 Kinematics of the Stellar Populations of M33

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340710h&link_type=abstract

American Astronomical Society, AAS Meeting #213, #407.10; Bulletin of the American Astronomical Society, Vol. 41, p.204

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We are quantifying the kinematics of the stellar populations (thin disk, thick disk and halo) of the nearby spiral galaxy M33. We separate bona fide M33 red giant stars from foreground Galactic dwarfs based on photometry in V, I, and narrow-band DDO51 filters. We then use the DEIMOS spectrograph at the Keck II 10-meter telescope to obtain spectra surrounding the Ca II near-infrared triplet lines for individual red giant stars throughout M33. We present radial velocities for 443 confirmed M33 stars from seven fields along the major and minor axes of the galaxy. In addition to a thin disk with an intrinsic velocity dispersion of 24 km/s, we detect a stellar halo. This halo shows a velocity dispersion of 54 km/s and makes up 8% of the stars in our spectroscopic fields. This 54 km/s halo dispersion is nearly 3 times smaller than the 145 km/s dispersion observed in M31's halo. Assuming the same mass to light ratio, this smaller velocity dispersion is expected since M31 is approximately 10 times more luminous than M33 and stellar velocity dispersion is proportional to the square root of the total mass. We also see evidence for a thick disk component that rotates slower than the neutral hydrogen gas and has a higher velocity dispersion than the stars in the thin disk.

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