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3D-Barolo: a new 3D algorithm to derive rotation curves of galaxies

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arxiv 1505.07834 v1 pith:QICHNH6K submitted 2015-05-28 astro-ph.GA

classification astro-ph.GA
keywords d-barologalaxiesrotationalgorithmcurvesdataderivelines
verification ladder T0 review T1 audit T2 compute T3 formal
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We present 3D-Barolo, a new code that derives rotation curves of galaxies from emission-line observations. This software fits 3D tilted-ring models to spectroscopic data-cubes and can be used with a variety of observations: from HI and molecular lines to optical/IR recombination lines. We describe the structure of the main algorithm and show that it performs much better than the standard 2D approach on velocity fields. A number of successful applications, from high to very low spatial resolution data are presented and discussed. 3D-Barolo can recover the true rotation curve and estimate the intrinsic velocity dispersion even in barely resolved galaxies (about 2 resolution elements) provided that the signal to noise of the data is larger that 2-3. It can also be run automatically thanks to its source-detection and first-estimate modules, which make it suitable for the analysis of large 3D datasets. These features make 3D-Barolo a uniquely useful tool to derive reliable kinematics for both local and high-redshift galaxies from a variety of different instruments including the new-generation IFUs, ALMA and the SKA pathfinders.

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Forward citations

Cited by 5 Pith papers

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