Statistics – Applications
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..383a&link_type=abstract
NOAO Proposal ID #1999B-0383
Statistics
Applications
Scientific paper
The Tully-Fisher (TF) relationship between rotation speed and luminosity is a powerful tool for extragalactic research. While the applications of TF are numerous, the scatter of the relation itself places constraints on models of galaxy formation and structure. One source of TF scatter which has not been sufficiently quantified is galaxy asymmetry. If galaxy disks are non-circular, measured inclination or position angles will be in error. Such errors could lead to much of the observed scatter in the TF relation. By comparing kinematic and photometric observations of face-on spiral disks, I propose to measure the intrinsic ellipticity of galaxy disks and assess its effect on TF scatter. In order to statistically constrain the intrinsic ellipticity of galaxy disks, a sample of ~30 galaxies with both high quality near- infrared images and two-dimensional velocity fields is needed. Near- infrared images provide the most accurate photometric axis ratios because they are relatively unaffected by dust and recent bursts of star formation. Integral field spectroscopy will be used to measure the kinematic axis ratio. The difference between the kinematic and photometric axis ratios is a measure of the intrinsic ellipticity of disk galaxies. The ellipticity can be translated into a measurement error of the photometric inclination angle which in turn contributes to the scatter in the TF relation.
Andersen David R.
Bershady Matthew A.
No associations
LandOfFree
The Effect of Spiral Galaxy Asymmetry on Tully-Fisher Scatter does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Effect of Spiral Galaxy Asymmetry on Tully-Fisher Scatter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Effect of Spiral Galaxy Asymmetry on Tully-Fisher Scatter will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1016110