The SAMI Galaxy Survey: gas content and interaction as the drivers of kinematic asymmetry
In order to determine the causes of kinematic asymmetry in the Hα gas in the SAMI (Sydney–AAO Multi-object IFS) Galaxy Survey sample, we investigate the comparative influences of environment and intrinsic properties of galaxies on perturbation. We use spatially resolved Hα velocity fields from t...
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ftcaltechauth:oai:authors.library.caltech.edu:2m0nm-hf221 2024-10-13T14:10:34+00:00 The SAMI Galaxy Survey: gas content and interaction as the drivers of kinematic asymmetry Bloom, J. V. Croom, S. M. Bryant, J. J. Schaefer, A. L. Bland-Hawthorn, J. Brough, S. Callingham, J. Cortese, L. Federrath, C. Scott, N. van de Sande, J. D'Eugenio, F. Sweet, S. Tonini, C. Allen, J. T. Goodwin, M. Green, A. W. Konstantopoulos, I. S. Lawrence, J. Lorente, N. Medling, A. M. Owers, M. S. Richards, S. N. Sharp, R. 2018-05-11 https://doi.org/10.1093/mnras/sty273 unknown Royal Astronomical Society https://arxiv.org/abs/1801.06628 https://doi.org/10.1093/mnras/sty273 eprintid:86320 info:eu-repo/semantics/openAccess Other Monthly Notices of the Royal Astronomical Society, 476(2), 2339-2351, (2018-05-11) techniques: imaging spectroscopy – galaxies: evolution – galaxies: interactions – galaxies: kinematics and dynamics – galaxies: structure info:eu-repo/semantics/article 2018 ftcaltechauth https://doi.org/10.1093/mnras/sty273 2024-09-25T18:46:37Z In order to determine the causes of kinematic asymmetry in the Hα gas in the SAMI (Sydney–AAO Multi-object IFS) Galaxy Survey sample, we investigate the comparative influences of environment and intrinsic properties of galaxies on perturbation. We use spatially resolved Hα velocity fields from the SAMI Galaxy Survey to quantify kinematic asymmetry (ν_(asym)) in nearby galaxies and environmental and stellar mass data from the Galaxy And Mass Assembly survey. We find that local environment, measured as distance to nearest neighbour, is inversely correlated with kinematic asymmetry for galaxies with log (M*/M⊙) > 10.0, but there is no significant correlation for galaxies with log (M*/M⊙) < 10.0. Moreover, low-mass galaxies [log (M*/M⊙) < 9.0] have greater kinematic asymmetry at all separations, suggesting a different physical source of asymmetry is important in low-mass galaxies. We propose that secular effects derived from gas fraction and gas mass may be the primary causes of asymmetry in low-mass galaxies. High gas fraction is linked to high σm/V (where σm is Hα velocity dispersion and V the rotation velocity), which is strongly correlated with (ν_(asym)), and galaxies with log (M*/M⊙) < 9.0 have offset σm/V from the rest of the sample. Further, asymmetry as a fraction of dispersion decreases for galaxies with log (M*/M⊙) < 9.0. Gas mass and asymmetry are also inversely correlated in our sample. We propose that low gas masses in dwarf galaxies may lead to asymmetric distribution of gas clouds, leading to increased relative turbulence. © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2018 January 12. Received 2018 January 12; in original form 2017 July 9. Published: 01 February 2018. 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 ... Article in Journal/Newspaper sami Caltech Authors (California Institute of Technology) Monthly Notices of the Royal Astronomical Society 476 2 2339 2351 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
unknown |
topic |
techniques: imaging spectroscopy – galaxies: evolution – galaxies: interactions – galaxies: kinematics and dynamics – galaxies: structure |
spellingShingle |
techniques: imaging spectroscopy – galaxies: evolution – galaxies: interactions – galaxies: kinematics and dynamics – galaxies: structure Bloom, J. V. Croom, S. M. Bryant, J. J. Schaefer, A. L. Bland-Hawthorn, J. Brough, S. Callingham, J. Cortese, L. Federrath, C. Scott, N. van de Sande, J. D'Eugenio, F. Sweet, S. Tonini, C. Allen, J. T. Goodwin, M. Green, A. W. Konstantopoulos, I. S. Lawrence, J. Lorente, N. Medling, A. M. Owers, M. S. Richards, S. N. Sharp, R. The SAMI Galaxy Survey: gas content and interaction as the drivers of kinematic asymmetry |
topic_facet |
techniques: imaging spectroscopy – galaxies: evolution – galaxies: interactions – galaxies: kinematics and dynamics – galaxies: structure |
description |
In order to determine the causes of kinematic asymmetry in the Hα gas in the SAMI (Sydney–AAO Multi-object IFS) Galaxy Survey sample, we investigate the comparative influences of environment and intrinsic properties of galaxies on perturbation. We use spatially resolved Hα velocity fields from the SAMI Galaxy Survey to quantify kinematic asymmetry (ν_(asym)) in nearby galaxies and environmental and stellar mass data from the Galaxy And Mass Assembly survey. We find that local environment, measured as distance to nearest neighbour, is inversely correlated with kinematic asymmetry for galaxies with log (M*/M⊙) > 10.0, but there is no significant correlation for galaxies with log (M*/M⊙) < 10.0. Moreover, low-mass galaxies [log (M*/M⊙) < 9.0] have greater kinematic asymmetry at all separations, suggesting a different physical source of asymmetry is important in low-mass galaxies. We propose that secular effects derived from gas fraction and gas mass may be the primary causes of asymmetry in low-mass galaxies. High gas fraction is linked to high σm/V (where σm is Hα velocity dispersion and V the rotation velocity), which is strongly correlated with (ν_(asym)), and galaxies with log (M*/M⊙) < 9.0 have offset σm/V from the rest of the sample. Further, asymmetry as a fraction of dispersion decreases for galaxies with log (M*/M⊙) < 9.0. Gas mass and asymmetry are also inversely correlated in our sample. We propose that low gas masses in dwarf galaxies may lead to asymmetric distribution of gas clouds, leading to increased relative turbulence. © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2018 January 12. Received 2018 January 12; in original form 2017 July 9. Published: 01 February 2018. 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 ... |
format |
Article in Journal/Newspaper |
author |
Bloom, J. V. Croom, S. M. Bryant, J. J. Schaefer, A. L. Bland-Hawthorn, J. Brough, S. Callingham, J. Cortese, L. Federrath, C. Scott, N. van de Sande, J. D'Eugenio, F. Sweet, S. Tonini, C. Allen, J. T. Goodwin, M. Green, A. W. Konstantopoulos, I. S. Lawrence, J. Lorente, N. Medling, A. M. Owers, M. S. Richards, S. N. Sharp, R. |
author_facet |
Bloom, J. V. Croom, S. M. Bryant, J. J. Schaefer, A. L. Bland-Hawthorn, J. Brough, S. Callingham, J. Cortese, L. Federrath, C. Scott, N. van de Sande, J. D'Eugenio, F. Sweet, S. Tonini, C. Allen, J. T. Goodwin, M. Green, A. W. Konstantopoulos, I. S. Lawrence, J. Lorente, N. Medling, A. M. Owers, M. S. Richards, S. N. Sharp, R. |
author_sort |
Bloom, J. V. |
title |
The SAMI Galaxy Survey: gas content and interaction as the drivers of kinematic asymmetry |
title_short |
The SAMI Galaxy Survey: gas content and interaction as the drivers of kinematic asymmetry |
title_full |
The SAMI Galaxy Survey: gas content and interaction as the drivers of kinematic asymmetry |
title_fullStr |
The SAMI Galaxy Survey: gas content and interaction as the drivers of kinematic asymmetry |
title_full_unstemmed |
The SAMI Galaxy Survey: gas content and interaction as the drivers of kinematic asymmetry |
title_sort |
sami galaxy survey: gas content and interaction as the drivers of kinematic asymmetry |
publisher |
Royal Astronomical Society |
publishDate |
2018 |
url |
https://doi.org/10.1093/mnras/sty273 |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society, 476(2), 2339-2351, (2018-05-11) |
op_relation |
https://arxiv.org/abs/1801.06628 https://doi.org/10.1093/mnras/sty273 eprintid:86320 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1093/mnras/sty273 |
container_title |
Monthly Notices of the Royal Astronomical Society |
container_volume |
476 |
container_issue |
2 |
container_start_page |
2339 |
op_container_end_page |
2351 |
_version_ |
1812817882928644096 |