The SAMI Galaxy Survey: Environmental analysis of the orbital structures of passive galaxies
Most dynamical models of galaxies to date assume axisymmetry, which is not representative of a significant fraction of massive galaxies. We have built triaxial orbit-superposition Schwarzschild models of galaxies observed by the SAMI Galaxy Survey, in order to reconstruct their inner orbital structu...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Oxford University Press (OUP)
2023
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Online Access: | http://hdl.handle.net/1959.3/471966 https://doi.org/10.1093/mnras/stad713 |
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ftswinburne:tle:b537e3fd-4815-4ebe-9fff-65c7011b2e9d:28f49f06-0da8-44be-9edc-ad1dd0a9c582:1 |
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ftswinburne:tle:b537e3fd-4815-4ebe-9fff-65c7011b2e9d:28f49f06-0da8-44be-9edc-ad1dd0a9c582:1 2023-06-11T04:16:22+02:00 The SAMI Galaxy Survey: Environmental analysis of the orbital structures of passive galaxies Santucci, Giulia Brough, Sarah van de Sande, Jesse McDermid, Richard Barsanti, Stefania Bland-Hawthorn, Joss Bryant, Julia J. Croom, Scott M. Lagos, Claudia Lawrence, Jon S. Owers, Matt S. van de Ven, Glenn Vaughan, Sam P. Yi, Sukyoung K. Swinburne University of Technology 2023 http://hdl.handle.net/1959.3/471966 https://doi.org/10.1093/mnras/stad713 unknown Oxford University Press (OUP) http://hdl.handle.net/1959.3/471966 https://doi.org/10.1093/mnras/stad713 Copyright © 2023 Monthly Notices of the Royal Astronomical Society, Vol. 521, no. 2 (Mar 2023), pp. 2671-2691 Journal article 2023 ftswinburne https://doi.org/10.1093/mnras/stad713 2023-04-24T22:27:47Z Most dynamical models of galaxies to date assume axisymmetry, which is not representative of a significant fraction of massive galaxies. We have built triaxial orbit-superposition Schwarzschild models of galaxies observed by the SAMI Galaxy Survey, in order to reconstruct their inner orbital structure and mass distribution. The sample consists of 153 passive galaxies with total stellar masses in the range 10(9.5) to 10(12) M-?. We present an analysis of the internal structures and intrinsic properties of these galaxies as a function of their environment. We measure their environment using three proxies: central or satellite designation, halo mass and local 5th nearest neighbour galaxy density. We find that although these intrinsic properties correlate most strongly with stellar mass, environment does play a secondary role: at fixed stellar mass, galaxies in the densest regions are more radially anisotropic. In addition, central galaxies, and galaxies in high local densities sho w lo wer v alues of edge-on spin parameter proxy ?(Re, EO). We also find suggestions of a possible trend of the fractions of orbits with environment for lower mass galaxies (between 10(9.5) and 10(11) M-?) such that, at fixed stellar mass, galaxies in higher local densities and halo mass have higher fractions of hot orbits and lower fractions of warm orbits. Our results demonstrate that after stellar mass, environment does play a role in shaping present-day passive galaxies. Article in Journal/Newspaper sami Swinburne University of Technology: Swinburne Research Bank Monthly Notices of the Royal Astronomical Society 521 2 2671 2691 |
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Swinburne University of Technology: Swinburne Research Bank |
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ftswinburne |
language |
unknown |
description |
Most dynamical models of galaxies to date assume axisymmetry, which is not representative of a significant fraction of massive galaxies. We have built triaxial orbit-superposition Schwarzschild models of galaxies observed by the SAMI Galaxy Survey, in order to reconstruct their inner orbital structure and mass distribution. The sample consists of 153 passive galaxies with total stellar masses in the range 10(9.5) to 10(12) M-?. We present an analysis of the internal structures and intrinsic properties of these galaxies as a function of their environment. We measure their environment using three proxies: central or satellite designation, halo mass and local 5th nearest neighbour galaxy density. We find that although these intrinsic properties correlate most strongly with stellar mass, environment does play a secondary role: at fixed stellar mass, galaxies in the densest regions are more radially anisotropic. In addition, central galaxies, and galaxies in high local densities sho w lo wer v alues of edge-on spin parameter proxy ?(Re, EO). We also find suggestions of a possible trend of the fractions of orbits with environment for lower mass galaxies (between 10(9.5) and 10(11) M-?) such that, at fixed stellar mass, galaxies in higher local densities and halo mass have higher fractions of hot orbits and lower fractions of warm orbits. Our results demonstrate that after stellar mass, environment does play a role in shaping present-day passive galaxies. |
author2 |
Swinburne University of Technology |
format |
Article in Journal/Newspaper |
author |
Santucci, Giulia Brough, Sarah van de Sande, Jesse McDermid, Richard Barsanti, Stefania Bland-Hawthorn, Joss Bryant, Julia J. Croom, Scott M. Lagos, Claudia Lawrence, Jon S. Owers, Matt S. van de Ven, Glenn Vaughan, Sam P. Yi, Sukyoung K. |
spellingShingle |
Santucci, Giulia Brough, Sarah van de Sande, Jesse McDermid, Richard Barsanti, Stefania Bland-Hawthorn, Joss Bryant, Julia J. Croom, Scott M. Lagos, Claudia Lawrence, Jon S. Owers, Matt S. van de Ven, Glenn Vaughan, Sam P. Yi, Sukyoung K. The SAMI Galaxy Survey: Environmental analysis of the orbital structures of passive galaxies |
author_facet |
Santucci, Giulia Brough, Sarah van de Sande, Jesse McDermid, Richard Barsanti, Stefania Bland-Hawthorn, Joss Bryant, Julia J. Croom, Scott M. Lagos, Claudia Lawrence, Jon S. Owers, Matt S. van de Ven, Glenn Vaughan, Sam P. Yi, Sukyoung K. |
author_sort |
Santucci, Giulia |
title |
The SAMI Galaxy Survey: Environmental analysis of the orbital structures of passive galaxies |
title_short |
The SAMI Galaxy Survey: Environmental analysis of the orbital structures of passive galaxies |
title_full |
The SAMI Galaxy Survey: Environmental analysis of the orbital structures of passive galaxies |
title_fullStr |
The SAMI Galaxy Survey: Environmental analysis of the orbital structures of passive galaxies |
title_full_unstemmed |
The SAMI Galaxy Survey: Environmental analysis of the orbital structures of passive galaxies |
title_sort |
sami galaxy survey: environmental analysis of the orbital structures of passive galaxies |
publisher |
Oxford University Press (OUP) |
publishDate |
2023 |
url |
http://hdl.handle.net/1959.3/471966 https://doi.org/10.1093/mnras/stad713 |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society, Vol. 521, no. 2 (Mar 2023), pp. 2671-2691 |
op_relation |
http://hdl.handle.net/1959.3/471966 https://doi.org/10.1093/mnras/stad713 |
op_rights |
Copyright © 2023 |
op_doi |
https://doi.org/10.1093/mnras/stad713 |
container_title |
Monthly Notices of the Royal Astronomical Society |
container_volume |
521 |
container_issue |
2 |
container_start_page |
2671 |
op_container_end_page |
2691 |
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1768374123350720512 |