The SAMI Galaxy Survey: The Internal Orbital Structure and Mass Distribution of Passive Galaxies from Triaxial Orbit-superposition Schwarzschild Models
Dynamical models are crucial for uncovering the internal dynamics of galaxies; however, most of the results to date assume axisymmetry, which is not representative of a significant fraction of massive galaxies. Here, we build triaxial Schwarzschild orbit-superposition models of galaxies taken from t...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/316467 2024-04-28T08:37:18+00:00 The SAMI Galaxy Survey: The Internal Orbital Structure and Mass Distribution of Passive Galaxies from Triaxial Orbit-superposition Schwarzschild Models Santucci, Giulia Brough, Sarah van de Sande, Jesse McDermid, Richard M van de Ven, Glenn Zhu, Ling D'Eugenio, Francesco Bland-Hawthorn, Joss Barsanti, Stefania Bryant, Julia J. application/pdf http://hdl.handle.net/1885/316467 https://doi.org/10.3847/1538-4357/ac5bd5 https://openresearch-repository.anu.edu.au/bitstream/1885/316467/3/Santucci_2022_ApJ_930_153.pdf.jpg en_AU eng IOP Publishing http://purl.org/au-research/grants/arc/CE170100013 http://purl.org/au-research/grants/arc/CE1101020 http://purl.org/au-research/grants/arc/FT140101166 http://purl.org/au-research/grants/arc/DE200100461 http://purl.org/au-research/grants/arc/FT150100333 http://purl.org/au-research/grants/arc/FF0776384 http://purl.org/au-research/grants/arc/LE130100198 http://purl.org/au-research/grants/arc/FT140100255 0004-637X http://hdl.handle.net/1885/316467 doi:10.3847/1538-4357/ac5bd5 https://openresearch-repository.anu.edu.au/bitstream/1885/316467/3/Santucci_2022_ApJ_930_153.pdf.jpg © 2022. The Author(s). Published by the American Astronomical Society https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International License The Astrophysical Journal Galaxy evolution Galaxy dynamics Galaxy structure Galaxy kinematics Journal article ftanucanberra https://doi.org/10.3847/1538-4357/ac5bd5 2024-04-09T23:31:30Z Dynamical models are crucial for uncovering the internal dynamics of galaxies; however, most of the results to date assume axisymmetry, which is not representative of a significant fraction of massive galaxies. Here, we build triaxial Schwarzschild orbit-superposition models of galaxies taken from the SAMI Galaxy Survey, in order to reconstruct their inner orbital structure and mass distribution. The sample consists of 161 passive galaxies with total stellar masses in the range 109.5-1012 M ⊙. We find that the changes in internal structures within 1R e are correlated with the total stellar mass of the individual galaxies. The majority of the galaxies in the sample (73% ± 3%) are oblate, while 19% ± 3% are mildly triaxial and 8% ± 2% have triaxial/prolate shape. Galaxies with logM⋆/M⊙>10.50 are more likely to be non-oblate. We find a mean dark matter fraction of f DM = 0.28 ± 0.20, within 1R e. Galaxies with higher intrinsic ellipticity (flatter) are found to have more negative velocity anisotropy β r (tangential anisotropy). β r also shows an anticorrelation with the edge-on spin parameter λRe,EO , so that β r decreases with increasing λRe,EO , reflecting the contribution from disk-like orbits in flat, fast-rotating galaxies. We see evidence of an increasing fraction of hot orbits with increasing stellar mass, while warm and cold orbits show a decreasing trend. We also find that galaxies with different (V/σ - h 3) kinematic signatures have distinct combinations of orbits. These results are in agreement with a formation scenario in which slow- and fast-rotating galaxies form through two main channels. The SAMI Galaxy Survey is based on observations made at the Anglo-Australian Telescope. SAMI was developed jointly by the University of Sydney and the Australian Astronomical Observatory. The SAMI input catalog is based on data taken from SDSS, the GAMA Survey, and the VST ATLAS Survey. The SAMI Galaxy Survey is supported by the Australian Research Council center of Excellence for All Sky Astro- physics in 3 ... Article in Journal/Newspaper sami Australian National University: ANU Digital Collections The Astrophysical Journal 930 2 153 |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
English |
topic |
Galaxy evolution Galaxy dynamics Galaxy structure Galaxy kinematics |
spellingShingle |
Galaxy evolution Galaxy dynamics Galaxy structure Galaxy kinematics Santucci, Giulia Brough, Sarah van de Sande, Jesse McDermid, Richard M van de Ven, Glenn Zhu, Ling D'Eugenio, Francesco Bland-Hawthorn, Joss Barsanti, Stefania Bryant, Julia J. The SAMI Galaxy Survey: The Internal Orbital Structure and Mass Distribution of Passive Galaxies from Triaxial Orbit-superposition Schwarzschild Models |
topic_facet |
Galaxy evolution Galaxy dynamics Galaxy structure Galaxy kinematics |
description |
Dynamical models are crucial for uncovering the internal dynamics of galaxies; however, most of the results to date assume axisymmetry, which is not representative of a significant fraction of massive galaxies. Here, we build triaxial Schwarzschild orbit-superposition models of galaxies taken from the SAMI Galaxy Survey, in order to reconstruct their inner orbital structure and mass distribution. The sample consists of 161 passive galaxies with total stellar masses in the range 109.5-1012 M ⊙. We find that the changes in internal structures within 1R e are correlated with the total stellar mass of the individual galaxies. The majority of the galaxies in the sample (73% ± 3%) are oblate, while 19% ± 3% are mildly triaxial and 8% ± 2% have triaxial/prolate shape. Galaxies with logM⋆/M⊙>10.50 are more likely to be non-oblate. We find a mean dark matter fraction of f DM = 0.28 ± 0.20, within 1R e. Galaxies with higher intrinsic ellipticity (flatter) are found to have more negative velocity anisotropy β r (tangential anisotropy). β r also shows an anticorrelation with the edge-on spin parameter λRe,EO , so that β r decreases with increasing λRe,EO , reflecting the contribution from disk-like orbits in flat, fast-rotating galaxies. We see evidence of an increasing fraction of hot orbits with increasing stellar mass, while warm and cold orbits show a decreasing trend. We also find that galaxies with different (V/σ - h 3) kinematic signatures have distinct combinations of orbits. These results are in agreement with a formation scenario in which slow- and fast-rotating galaxies form through two main channels. The SAMI Galaxy Survey is based on observations made at the Anglo-Australian Telescope. SAMI was developed jointly by the University of Sydney and the Australian Astronomical Observatory. The SAMI input catalog is based on data taken from SDSS, the GAMA Survey, and the VST ATLAS Survey. The SAMI Galaxy Survey is supported by the Australian Research Council center of Excellence for All Sky Astro- physics in 3 ... |
format |
Article in Journal/Newspaper |
author |
Santucci, Giulia Brough, Sarah van de Sande, Jesse McDermid, Richard M van de Ven, Glenn Zhu, Ling D'Eugenio, Francesco Bland-Hawthorn, Joss Barsanti, Stefania Bryant, Julia J. |
author_facet |
Santucci, Giulia Brough, Sarah van de Sande, Jesse McDermid, Richard M van de Ven, Glenn Zhu, Ling D'Eugenio, Francesco Bland-Hawthorn, Joss Barsanti, Stefania Bryant, Julia J. |
author_sort |
Santucci, Giulia |
title |
The SAMI Galaxy Survey: The Internal Orbital Structure and Mass Distribution of Passive Galaxies from Triaxial Orbit-superposition Schwarzschild Models |
title_short |
The SAMI Galaxy Survey: The Internal Orbital Structure and Mass Distribution of Passive Galaxies from Triaxial Orbit-superposition Schwarzschild Models |
title_full |
The SAMI Galaxy Survey: The Internal Orbital Structure and Mass Distribution of Passive Galaxies from Triaxial Orbit-superposition Schwarzschild Models |
title_fullStr |
The SAMI Galaxy Survey: The Internal Orbital Structure and Mass Distribution of Passive Galaxies from Triaxial Orbit-superposition Schwarzschild Models |
title_full_unstemmed |
The SAMI Galaxy Survey: The Internal Orbital Structure and Mass Distribution of Passive Galaxies from Triaxial Orbit-superposition Schwarzschild Models |
title_sort |
sami galaxy survey: the internal orbital structure and mass distribution of passive galaxies from triaxial orbit-superposition schwarzschild models |
publisher |
IOP Publishing |
url |
http://hdl.handle.net/1885/316467 https://doi.org/10.3847/1538-4357/ac5bd5 https://openresearch-repository.anu.edu.au/bitstream/1885/316467/3/Santucci_2022_ApJ_930_153.pdf.jpg |
genre |
sami |
genre_facet |
sami |
op_source |
The Astrophysical Journal |
op_relation |
http://purl.org/au-research/grants/arc/CE170100013 http://purl.org/au-research/grants/arc/CE1101020 http://purl.org/au-research/grants/arc/FT140101166 http://purl.org/au-research/grants/arc/DE200100461 http://purl.org/au-research/grants/arc/FT150100333 http://purl.org/au-research/grants/arc/FF0776384 http://purl.org/au-research/grants/arc/LE130100198 http://purl.org/au-research/grants/arc/FT140100255 0004-637X http://hdl.handle.net/1885/316467 doi:10.3847/1538-4357/ac5bd5 https://openresearch-repository.anu.edu.au/bitstream/1885/316467/3/Santucci_2022_ApJ_930_153.pdf.jpg |
op_rights |
© 2022. The Author(s). Published by the American Astronomical Society https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International License |
op_doi |
https://doi.org/10.3847/1538-4357/ac5bd5 |
container_title |
The Astrophysical Journal |
container_volume |
930 |
container_issue |
2 |
container_start_page |
153 |
_version_ |
1797568762491174912 |