The SAMI Galaxy Survey: Stellar and gas misalignments and the origin of gas in nearby galaxies
Misalignment of gas and stellar rotation in galaxies can give clues to the origin and processing of accreted gas. Integral field spectroscopic observations of 1213 galaxies from the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey show that 11 per cent of galaxies with fitted...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Oxford University Press (OUP)
2018
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Online Access: | http://hdl.handle.net/1959.3/448792 https://doi.org/10.1093/mnras/sty3122 |
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ftswinburne:tle:23f32394-07a8-472c-a17b-360c4396f6f7:28f49f06-0da8-44be-9edc-ad1dd0a9c582:1 2023-05-15T18:11:20+02:00 The SAMI Galaxy Survey: Stellar and gas misalignments and the origin of gas in nearby galaxies Bryant, J. J. Croom, S. M. van de Sande, J. Scott, N Fogarty, L. M. R. Bland-Hawthorn, J. Bloom, J. V. Taylor, E. N. Brough, S. Robotham, A. Cortese, L. Couch, W. Owers, M. S. Medling, A. M. Federrath, C. Bekki, K. Richards, S. N. Lawrence, J. S. Konstantopoulos, I. S. Swinburne University of Technology 2018 http://hdl.handle.net/1959.3/448792 https://doi.org/10.1093/mnras/sty3122 unknown Oxford University Press (OUP) http://purl.org/au-research/grants/arc/CE110001020 http://purl.org/au-research/grants/arc/CE170100013 http://purl.org/au-research/grants/arc/FT180100231 http://purl.org/au-research/grants/arc/FT100100457 http://purl.org/au-research/grants/arc/DP130100664 http://purl.org/au-research/grants/arc/FT180100066 http://purl.org/au-research/grants/arc/FT140101166 http://purl.org/au-research/grants/arc/FL140100278 http://purl.org/au-research/grants/arc/FT140100255 http://purl.org/au-research/grants/arc/DP150104329 http://purl.org/au-research/grants/arc/DP170100603 http://purl.org/au-research/grants/arc/FT180100495 http://hdl.handle.net/1959.3/448792 https://doi.org/10.1093/mnras/sty3122 This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. Copyright © 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Monthly Notices of the Royal Astronomical Society, Vol. 483, no. 1 (Nov 2018), pp. 458-479 Journal article 2018 ftswinburne https://doi.org/10.1093/mnras/sty3122 2019-09-07T21:20:02Z Misalignment of gas and stellar rotation in galaxies can give clues to the origin and processing of accreted gas. Integral field spectroscopic observations of 1213 galaxies from the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey show that 11 per cent of galaxies with fitted gas and stellar rotation are misaligned by more than 30 degrees in both field/group and cluster environments. Using SAMI morphological classifications and Sersic indices, the misalignment fraction is 45 +/- 6 per cent in early-type galaxies (ETGs), but only 5 +/- 1 per cent in late-type galaxies (LTGs). The distribution of position angle offsets is used to test the physical drivers of this difference. Slower dynamical settling time of the gas in elliptical stellar mass distributions accounts for a small increase in misalignment in early-type galaxies. However, gravitational dynamical settling time is insufficient to fully explain the observed differences between ETGs and LTGs in the distributions of the gas/stellar position angle offsets. LTGs have primarily accreted gas close to aligned rather than settled from misaligned based on analysis of the skewed distribution of PA offsets compared to a dynamical settling model. Local environment density is less important in setting the misalignment fractions than morphology, suggesting that mergers are not the main source of accreted gas in these discs. Cluster environments are found to have gas misalignment driven primarily by cluster processes not by gas accretion. Article in Journal/Newspaper sami Swinburne University of Technology: Swinburne Research Bank Monthly Notices of the Royal Astronomical Society 483 1 458 479 |
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Swinburne University of Technology: Swinburne Research Bank |
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ftswinburne |
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description |
Misalignment of gas and stellar rotation in galaxies can give clues to the origin and processing of accreted gas. Integral field spectroscopic observations of 1213 galaxies from the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey show that 11 per cent of galaxies with fitted gas and stellar rotation are misaligned by more than 30 degrees in both field/group and cluster environments. Using SAMI morphological classifications and Sersic indices, the misalignment fraction is 45 +/- 6 per cent in early-type galaxies (ETGs), but only 5 +/- 1 per cent in late-type galaxies (LTGs). The distribution of position angle offsets is used to test the physical drivers of this difference. Slower dynamical settling time of the gas in elliptical stellar mass distributions accounts for a small increase in misalignment in early-type galaxies. However, gravitational dynamical settling time is insufficient to fully explain the observed differences between ETGs and LTGs in the distributions of the gas/stellar position angle offsets. LTGs have primarily accreted gas close to aligned rather than settled from misaligned based on analysis of the skewed distribution of PA offsets compared to a dynamical settling model. Local environment density is less important in setting the misalignment fractions than morphology, suggesting that mergers are not the main source of accreted gas in these discs. Cluster environments are found to have gas misalignment driven primarily by cluster processes not by gas accretion. |
author2 |
Swinburne University of Technology |
format |
Article in Journal/Newspaper |
author |
Bryant, J. J. Croom, S. M. van de Sande, J. Scott, N Fogarty, L. M. R. Bland-Hawthorn, J. Bloom, J. V. Taylor, E. N. Brough, S. Robotham, A. Cortese, L. Couch, W. Owers, M. S. Medling, A. M. Federrath, C. Bekki, K. Richards, S. N. Lawrence, J. S. Konstantopoulos, I. S. |
spellingShingle |
Bryant, J. J. Croom, S. M. van de Sande, J. Scott, N Fogarty, L. M. R. Bland-Hawthorn, J. Bloom, J. V. Taylor, E. N. Brough, S. Robotham, A. Cortese, L. Couch, W. Owers, M. S. Medling, A. M. Federrath, C. Bekki, K. Richards, S. N. Lawrence, J. S. Konstantopoulos, I. S. The SAMI Galaxy Survey: Stellar and gas misalignments and the origin of gas in nearby galaxies |
author_facet |
Bryant, J. J. Croom, S. M. van de Sande, J. Scott, N Fogarty, L. M. R. Bland-Hawthorn, J. Bloom, J. V. Taylor, E. N. Brough, S. Robotham, A. Cortese, L. Couch, W. Owers, M. S. Medling, A. M. Federrath, C. Bekki, K. Richards, S. N. Lawrence, J. S. Konstantopoulos, I. S. |
author_sort |
Bryant, J. J. |
title |
The SAMI Galaxy Survey: Stellar and gas misalignments and the origin of gas in nearby galaxies |
title_short |
The SAMI Galaxy Survey: Stellar and gas misalignments and the origin of gas in nearby galaxies |
title_full |
The SAMI Galaxy Survey: Stellar and gas misalignments and the origin of gas in nearby galaxies |
title_fullStr |
The SAMI Galaxy Survey: Stellar and gas misalignments and the origin of gas in nearby galaxies |
title_full_unstemmed |
The SAMI Galaxy Survey: Stellar and gas misalignments and the origin of gas in nearby galaxies |
title_sort |
sami galaxy survey: stellar and gas misalignments and the origin of gas in nearby galaxies |
publisher |
Oxford University Press (OUP) |
publishDate |
2018 |
url |
http://hdl.handle.net/1959.3/448792 https://doi.org/10.1093/mnras/sty3122 |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society, Vol. 483, no. 1 (Nov 2018), pp. 458-479 |
op_relation |
http://purl.org/au-research/grants/arc/CE110001020 http://purl.org/au-research/grants/arc/CE170100013 http://purl.org/au-research/grants/arc/FT180100231 http://purl.org/au-research/grants/arc/FT100100457 http://purl.org/au-research/grants/arc/DP130100664 http://purl.org/au-research/grants/arc/FT180100066 http://purl.org/au-research/grants/arc/FT140101166 http://purl.org/au-research/grants/arc/FL140100278 http://purl.org/au-research/grants/arc/FT140100255 http://purl.org/au-research/grants/arc/DP150104329 http://purl.org/au-research/grants/arc/DP170100603 http://purl.org/au-research/grants/arc/FT180100495 http://hdl.handle.net/1959.3/448792 https://doi.org/10.1093/mnras/sty3122 |
op_rights |
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. Copyright © 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
op_doi |
https://doi.org/10.1093/mnras/sty3122 |
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Monthly Notices of the Royal Astronomical Society |
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483 |
container_issue |
1 |
container_start_page |
458 |
op_container_end_page |
479 |
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1766184004087709696 |