Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21522909p&link_type=abstract
American Astronomical Society, AAS Meeting #215, #229.09; Bulletin of the American Astronomical Society, Vol. 42, p.578
Other
2
Scientific paper
Parametric fitting using analytic functions (e.g. Sérsic) is one of the useful ways to quantify the physical size, central concentration, surface brightness, axis ratio, and luminosity of galaxies over cosmic time. However, these are only a subset of fundamental parameters that characterize the global properties of galaxies. Galaxies interact and merge, causing large disturbances in global structures. As such, global distortion is another fundamental, physical, state of a galaxy. To date, global disturbances have not been quantified by parametric fitting techniques because they relied mostly on axisymmetric ellipsoid shapes for their models. In this talk, I will discuss one way to break free from the use of ellipsoid models, and in so doing it enables us to quantify asymmetry using fully parametric models. This is useful both for quantifying merger rates over cosmic time, and for decomposing any given galaxy into symmetric versus asymmetric, and low versus high surface brightness, components. I will describe the use of GALFIT on high redshift galaxies to date, and show examples of this new capability. I will also discuss good habits to adopt, and bad habits to avoid, when performing parametric analysis in general.
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