Other
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011noao.prop..116j&link_type=abstract
NOAO Proposal ID #2011A-0116
Other
Scientific paper
DDO 125 may contain little or no dark matter, according to some radio observations of the neutral hydrogen gas in the disk. However, no dark matter could be the result of assuming a maximum stellar disk but, we can find out about the real stellar disk from kinematics of the stars. If a turnover in the rotation of the stars is detected and the rotation of the stars is flat after the turnover point, then dark matter would be needed to explain the stellar rotation curve of DDO 125. If there is, in fact, no turnover point and the stars and the gas follow each other kinematically, then there may be little or no dark matter detectable in this system. This could indicate a different evolutionary history. There are recent studies that show stars and gas do not move in the same way, thus, it could be quite possible that the stars and the gas of DDO 125 do not follow each other. Therefore, we propose to use the KPNO 4-m+Echelle as a 3 arcmin longslit spectrograph to obtain the stellar kinematics of DDO 125. We will use a cross-correlation function to determine heliocentric radial velocities and velocity dispersions as a function of radius for the stellar disk of DDO 125 and compare these to the gas kinematics determined from newly acquired 21 cm VLA HI data.
Hunter Deidre
Jackson Megan
Oh Se-Heon
RUBIN Vera
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