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4th of July 2015
Kinematic Modelling of Warped Galaxy Discs
by Peter Kamphuis (CASS)
Kinematical parameterisations of disc galaxies, employing emission line observations, are indispensable tools for studying the formation and evolution of galaxies. In Kamphuis et al. (2015) we present an automated procedure which fits tilted-ring models to HI data cubes of individual, well-resolved galaxies, the so-called Fully Automated TiRiFiC (FAT) an IDL wrapper around TiRiFiC (Jozsa 2007). FAT accurately models the kinematics and the morphologies of galaxies with an extent of eight beams across the major axis in the inclination range 20 to 90 degrees without the need for priors such as disc inclination. When comparing to 2D methods we find that velocity fields cannot be used to determine inclinations in galaxies that are marginally resolved. We conclude that with the current code tilted-ring models can be produced in a fully automated fashion. This will be essential for future HI surveys, with the Square Kilometre Array (SKA) and its pathfinders. - The picture above (click to enlarge) shows some of the measured and modelled HI velocity fields of LVHIS galaxies obtained with the Australia Telescope Compact Array (ATCA).

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