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Falcon-Barroso, J and Martig, M (2021) BAYES-LOSVD: A Bayesian framework for non-parametric extraction of the line-of-sight velocity distribution of galaxies. Astronomy and Astrophysics, 646. ISSN 0004-6361
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BAYES-LOSVD A Bayesian framework for non-parametric extraction of the line-of-sight velocity distribution of galaxies.pdf - Published Version Download (2MB) | Preview |
Abstract
We introduce BAYES-LOSVD, a novel implementation of the non-parametric extraction of line-of-sight velocity distributions (LOSVDs) in galaxies. We employed Bayesian inference to obtain robust LOSVDs and associated uncertainties. Our method relies on a principal component analysis to reduce the dimensionality on the set of templates required for the extraction and thus increase the performance of the code. In addition, we implemented several options to regularise the output solutions. Our tests, conducted on mock spectra, confirm the ability of our approach to model a wide range of LOSVD shapes, overcoming limitations of the most widely used parametric methods (e.g., Gauss-Hermite expansion). We present examples of LOSVD extractions for real galaxies with known peculiar LOSVD shapes, including NGC 4371, IC 0719, and NGC 4550, using MUSE and SAURON integral-field unit (IFU) data. Our implementation can also handle data from other popular IFU surveys (e.g., ATLAS3D, CALIFA, MaNGA, SAMI).
| Item Type: | Article |
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| Additional Information: | Falcon-Barroso, J & Martig, M. BAYES-LOSVD: A Bayesian framework for non-parametric extraction of the line-of-sight velocity distribution of galaxies. Astronomy and Astrophysics 646. https://dx.doi.org/10.1051/0004-6361/202039624 |
| Uncontrolled Keywords: | 0201 Astronomical and Space Sciences |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | EDP Sciences |
| Related URLs: | |
| Date Deposited: | 20 Sep 2021 09:16 |
| Last Modified: | 20 Sep 2021 09:16 |
| DOI or ID number: | 10.1051/0004-6361/202039624 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/15512 |
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