3D BAROLO: a new 3D algorithm to derive rotation curves of galaxies
Abstract
We present ^{3{D}}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 H I 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 (∼2 resolution elements) provided that the signal to noise of the data is larger than 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 data sets. 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 Integral Field Units, ALMA and the SKA pathfinders.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- August 2015
- DOI:
- 10.1093/mnras/stv1213
- arXiv:
- arXiv:1505.07834
- Bibcode:
- 2015MNRAS.451.3021D
- Keywords:
-
- methods: data analysis;
- galaxies: kinematics and dynamics;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 13 pages + 5 (appendix). Accepted for publication in MNRAS. Code available at http://editeodoro.github.io/Bbarolo