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 the S...
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Oxford University Press
2018
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Online Access: | https://espace.library.uq.edu.au/view/UQ:5751e83/UQ5751e83_OA.pdf https://espace.library.uq.edu.au/view/UQ:5751e83 |
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:5751e83 2023-05-15T18:11:21+02:00 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. 2018-02-01 https://espace.library.uq.edu.au/view/UQ:5751e83/UQ5751e83_OA.pdf https://espace.library.uq.edu.au/view/UQ:5751e83 eng eng Oxford University Press doi:10.1093/mnras/sty273 issn:0035-8711 issn:1365-2966 orcid:0000-0002-1576-2505 CE110001020 HST-HF2-51377 NAS5-26555 FT100100457 FT140100255 Space and Planetary Science Astronomy and Astrophysics Journal Article 2018 ftunivqespace https://doi.org/10.1093/mnras/sty273 2020-12-08T07:44:42Z 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 (vasym¯¯¯¯¯¯¯¯¯¯¯) 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 σmV (where σm is Hα velocity dispersion and V the rotation velocity), which is strongly correlated with vasym¯¯¯¯¯¯¯¯¯¯¯, and galaxies with log (M*/M⊙) < 9.0 have offset σmV¯¯¯¯¯¯ 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. Article in Journal/Newspaper sami The University of Queensland: UQ eSpace Monthly Notices of the Royal Astronomical Society 476 2 2339 2351 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Space and Planetary Science Astronomy and Astrophysics |
spellingShingle |
Space and Planetary Science Astronomy and Astrophysics 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 |
Space and Planetary Science Astronomy and Astrophysics |
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 (vasym¯¯¯¯¯¯¯¯¯¯¯) 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 σmV (where σm is Hα velocity dispersion and V the rotation velocity), which is strongly correlated with vasym¯¯¯¯¯¯¯¯¯¯¯, and galaxies with log (M*/M⊙) < 9.0 have offset σmV¯¯¯¯¯¯ 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. |
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 |
Oxford University Press |
publishDate |
2018 |
url |
https://espace.library.uq.edu.au/view/UQ:5751e83/UQ5751e83_OA.pdf https://espace.library.uq.edu.au/view/UQ:5751e83 |
genre |
sami |
genre_facet |
sami |
op_relation |
doi:10.1093/mnras/sty273 issn:0035-8711 issn:1365-2966 orcid:0000-0002-1576-2505 CE110001020 HST-HF2-51377 NAS5-26555 FT100100457 FT140100255 |
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_ |
1766184025458737152 |