Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21547019l&link_type=abstract
American Astronomical Society, AAS Meeting #215, #470.19; Bulletin of the American Astronomical Society, Vol. 42, p.517
Astronomy and Astrophysics
Astronomy
Scientific paper
The RESOLVE (REsolved Spectroscopy Of a Local VolumE) Survey will quantify the stellar, gas, and total dynamical mass of every galaxy with baryonic mass >109 Msun within a well-defined volume of the local universe. The survey's all-inclusive nature presents substantial challenges for dynamical mass measurement, best addressed by 2D velocity field modeling and statistical analysis. Here we describe a straightforward method to translate observational velocity fields into intrinsic maximal rotation velocities and inclinations. Initially, we build a library of model galaxy velocity fields based on a simple rotating disk model. We then use chi-squared minimization to find the best fit model to our observational data. We present an example implementation of this approach for SparsePak IFU data. We also discuss a method for determining the intrinsic flattening of specific classes of galaxies through the statistical comparison of real data and randomly oriented galaxy models.
Cui Yi
Kannappan Sheila J.
Liu Xuan
Norris Mark A.
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