Self-consistent Bulge/Disk/Halo Galaxy Dynamical Modeling Using Integral Field Kinematics
We introduce a method for modeling disk galaxies designed to take full advantage of data from integral field spectroscopy (IFS). The method fits equilibrium models to simultaneously reproduce the surface brightness, rotation, and velocity dispersion profiles of a galaxy. The models are fully self-co...
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Online Access: | https://doi.org/10.3847/1538-4357/aa9221 |
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ftcaltechauth:oai:authors.library.caltech.edu:jvqbf-sjq03 2024-10-13T14:10:34+00:00 Self-consistent Bulge/Disk/Halo Galaxy Dynamical Modeling Using Integral Field Kinematics Taranu, D. S. Medling, A. M. 2017-11-20 https://doi.org/10.3847/1538-4357/aa9221 unknown American Astronomical Society https://arxiv.org/abs/1710.03241 eprintid:83399 info:eu-repo/semantics/openAccess Other Astrophysical Journal, 850(1), Art. No. 70, (2017-11-20) galaxies: fundamental parameters – galaxies: spiral – galaxies: structure – methods: data analysis info:eu-repo/semantics/article 2017 ftcaltechauth https://doi.org/10.3847/1538-4357/aa9221 2024-09-25T18:46:36Z We introduce a method for modeling disk galaxies designed to take full advantage of data from integral field spectroscopy (IFS). The method fits equilibrium models to simultaneously reproduce the surface brightness, rotation, and velocity dispersion profiles of a galaxy. The models are fully self-consistent 6D distribution functions for a galaxy with a Sérsic profile stellar bulge, exponential disk, and parametric dark-matter halo, generated by an updated version of GalactICS. By creating realistic flux-weighted maps of the kinematic moments (flux, mean velocity, and dispersion), we simultaneously fit photometric and spectroscopic data using both maximum-likelihood and Bayesian (MCMC) techniques. We apply the method to a GAMA spiral galaxy (G79635) with kinematics from the SAMI Galaxy Survey and deep g- and r-band photometry from the VST-KiDS survey, comparing parameter constraints with those from traditional 2D bulge–disk decomposition. Our method returns broadly consistent results for shared parameters while constraining the mass-to-light ratios of stellar components and reproducing the H i-inferred circular velocity well beyond the limits of the SAMI data. Although the method is tailored for fitting integral field kinematic data, it can use other dynamical constraints like central fiber dispersions and H i circular velocities, and is well-suited for modeling galaxies with a combination of deep imaging and H i and/or optical spectra (resolved or otherwise). Our implementation (MagRite) is computationally efficient and can generate well-resolved models and kinematic maps in under a minute on modern processors. © 2017 The American Astronomical Society. Received 2017 March 10; revised 2017 August 30; accepted 2017 October 6; published 2017 November 17. The SAMI Galaxy Survey is based on observations made at the Anglo-Australian Telescope. The Sydney-AAO Multi-object Integral field spectrograph (SAMI) was developed jointly by the University of Sydney and the Australian Astronomical Observatory. The SAMI ... Article in Journal/Newspaper sami Caltech Authors (California Institute of Technology) The Astrophysical Journal 850 1 70 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
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topic |
galaxies: fundamental parameters – galaxies: spiral – galaxies: structure – methods: data analysis |
spellingShingle |
galaxies: fundamental parameters – galaxies: spiral – galaxies: structure – methods: data analysis Taranu, D. S. Medling, A. M. Self-consistent Bulge/Disk/Halo Galaxy Dynamical Modeling Using Integral Field Kinematics |
topic_facet |
galaxies: fundamental parameters – galaxies: spiral – galaxies: structure – methods: data analysis |
description |
We introduce a method for modeling disk galaxies designed to take full advantage of data from integral field spectroscopy (IFS). The method fits equilibrium models to simultaneously reproduce the surface brightness, rotation, and velocity dispersion profiles of a galaxy. The models are fully self-consistent 6D distribution functions for a galaxy with a Sérsic profile stellar bulge, exponential disk, and parametric dark-matter halo, generated by an updated version of GalactICS. By creating realistic flux-weighted maps of the kinematic moments (flux, mean velocity, and dispersion), we simultaneously fit photometric and spectroscopic data using both maximum-likelihood and Bayesian (MCMC) techniques. We apply the method to a GAMA spiral galaxy (G79635) with kinematics from the SAMI Galaxy Survey and deep g- and r-band photometry from the VST-KiDS survey, comparing parameter constraints with those from traditional 2D bulge–disk decomposition. Our method returns broadly consistent results for shared parameters while constraining the mass-to-light ratios of stellar components and reproducing the H i-inferred circular velocity well beyond the limits of the SAMI data. Although the method is tailored for fitting integral field kinematic data, it can use other dynamical constraints like central fiber dispersions and H i circular velocities, and is well-suited for modeling galaxies with a combination of deep imaging and H i and/or optical spectra (resolved or otherwise). Our implementation (MagRite) is computationally efficient and can generate well-resolved models and kinematic maps in under a minute on modern processors. © 2017 The American Astronomical Society. Received 2017 March 10; revised 2017 August 30; accepted 2017 October 6; published 2017 November 17. The SAMI Galaxy Survey is based on observations made at the Anglo-Australian Telescope. The Sydney-AAO Multi-object Integral field spectrograph (SAMI) was developed jointly by the University of Sydney and the Australian Astronomical Observatory. The SAMI ... |
format |
Article in Journal/Newspaper |
author |
Taranu, D. S. Medling, A. M. |
author_facet |
Taranu, D. S. Medling, A. M. |
author_sort |
Taranu, D. S. |
title |
Self-consistent Bulge/Disk/Halo Galaxy Dynamical Modeling Using Integral Field Kinematics |
title_short |
Self-consistent Bulge/Disk/Halo Galaxy Dynamical Modeling Using Integral Field Kinematics |
title_full |
Self-consistent Bulge/Disk/Halo Galaxy Dynamical Modeling Using Integral Field Kinematics |
title_fullStr |
Self-consistent Bulge/Disk/Halo Galaxy Dynamical Modeling Using Integral Field Kinematics |
title_full_unstemmed |
Self-consistent Bulge/Disk/Halo Galaxy Dynamical Modeling Using Integral Field Kinematics |
title_sort |
self-consistent bulge/disk/halo galaxy dynamical modeling using integral field kinematics |
publisher |
American Astronomical Society |
publishDate |
2017 |
url |
https://doi.org/10.3847/1538-4357/aa9221 |
genre |
sami |
genre_facet |
sami |
op_source |
Astrophysical Journal, 850(1), Art. No. 70, (2017-11-20) |
op_relation |
https://arxiv.org/abs/1710.03241 eprintid:83399 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.3847/1538-4357/aa9221 |
container_title |
The Astrophysical Journal |
container_volume |
850 |
container_issue |
1 |
container_start_page |
70 |
_version_ |
1812817881151307776 |