Understanding a Cosmic Yardstick Simulating Neutral Hydrogen in Disk Galaxies

Details Understanding a Cosmic Yardstick Simulating Neutral Hydrogen in Disk Galaxies Understanding a Cosmic Yardstick Simulating Neutral Hydrogen in Disk Galaxies

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7729s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #77.29; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

I am developing a 3-dimensional model of neutral hydrogen (HI) in disk galaxies to study galaxy kinematics and its effects on the Tully-Fisher (TF) relation. Many factors can introduce bias in the TF relation. The study of these factors is important because, if not corrected, these factors would result in a bias in distances determined from the TF relation. One of the important sources of bias lies in the estimation and correction of turbulent motions. The current practices result in over-correcting for turbulent velocities. This correction is larger for smaller galaxies, and thus turbulent motion corrections introduce errors as well as bias in the distances.
We simulated HI in UGC7321 and compared the simulated line profile and channel maps with the observations of the galaxy. Both show good agreement with the published results, with the caveat that the best-fit rotation curve and turbulent velocity are slightly different from the ones published in literature. One of the reasons for this discrepancy could be because of the lack of flaring/warping of HI in our model, while UGC7321 clearly shows signs of warping and flaring.

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