The SAMI galaxy survey: kinematics of dusty early-type galaxies
Recently, large samples of visually classified early-type galaxies (ETGs) containing dust have been identified using space-based infrared observations with the Herschel Space Telescope. The presence of large quantities of dust in massive ETGs is peculiar as X-ray halos of these galaxies are expected...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Oxford University Press (OUP)
2017
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Online Access: | http://hdl.handle.net/1959.3/435911 https://doi.org/10.1093/mnras/stx1000 |
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ftswinburne:tle:b448fd3e-498c-4e47-94fd-33965871cfed:28f49f06-0da8-44be-9edc-ad1dd0a9c582:1 2023-05-15T18:11:48+02:00 The SAMI galaxy survey: kinematics of dusty early-type galaxies Bassett, Robert Bekki, K. Cortese, L. Couch, W. J. Sansom, A. E. van de Sande, J. Bryant, J. J. Foster, C. Croom, S. M. Brough, S. Sweet, S. M. Medling, A. M. Owers, M. S. Driver, S. P. Davies, L. J. M. Wong, O. I. Groves, B. A. Bland-Hawthorn, J. Richards, S. N. Goodwin, M. Konstantopoulos, I. S. Lawrence, J. S. Swinburne University of Technology 2017 http://hdl.handle.net/1959.3/435911 https://doi.org/10.1093/mnras/stx1000 unknown Oxford University Press (OUP) http://purl.org/au-research/grants/arc/DP130100664 http://purl.org/au-research/grants/arc/FL140100278 http://purl.org/au-research/grants/arc/FT100100457 http://purl.org/au-research/grants/arc/FT140101166 http://purl.org/au-research/grants/arc/FT140100255 http://hdl.handle.net/1959.3/435911 https://doi.org/10.1093/mnras/stx1000 Copyright © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Monthly Notices of the Royal Astronomical Society, Vol. 470, no. 2 (Sep 2017), pp. 1991-2006 Journal article 2017 ftswinburne https://doi.org/10.1093/mnras/stx1000 2019-09-07T21:30:51Z Recently, large samples of visually classified early-type galaxies (ETGs) containing dust have been identified using space-based infrared observations with the Herschel Space Telescope. The presence of large quantities of dust in massive ETGs is peculiar as X-ray halos of these galaxies are expected to destroy dust in 10 Myr (or less). This has sparked a debate regarding the origin of the dust: is it internally produced by asymptotic giant branch (AGB) stars, or is it accreted externally through mergers? We examine the 2D stellar and ionised gas kinematics of dusty ETGs using IFS observations from the SAMI galaxy survey, and integrated star-formation rates, stellar masses, and dust masses from the GAMA survey. Only 8% (4/49) of visually-classified ETGs are kinematically consistent with being dispersion-supported systems. These "dispersion-dominated galaxies" exhibit discrepancies between stellar and ionised gas kinematics, either offsets in the kinematic position angle or large differences in the rotational velocity, and are outliers in star-formation rate at a fixed dust mass compared to normal star-forming galaxies. These properties are suggestive of recent merger activity. The remaining 90% of dusty ETGs have low velocity dispersions and/or large circular velocities, typical of "rotation-dominated galaxies". These results, along with the general evidence of published works on X-ray emission in ETGs, suggest that they are unlikely to host hot, X-ray gas consistent with their low stellar mass when compared to dispersion-dominated galaxies. This means dust will be long lived and thus these galaxies do not require external scenarios for the origin of their dust content. Article in Journal/Newspaper sami Swinburne University of Technology: Swinburne Research Bank Monthly Notices of the Royal Astronomical Society 470 2 1991 2006 |
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Open Polar |
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Swinburne University of Technology: Swinburne Research Bank |
op_collection_id |
ftswinburne |
language |
unknown |
description |
Recently, large samples of visually classified early-type galaxies (ETGs) containing dust have been identified using space-based infrared observations with the Herschel Space Telescope. The presence of large quantities of dust in massive ETGs is peculiar as X-ray halos of these galaxies are expected to destroy dust in 10 Myr (or less). This has sparked a debate regarding the origin of the dust: is it internally produced by asymptotic giant branch (AGB) stars, or is it accreted externally through mergers? We examine the 2D stellar and ionised gas kinematics of dusty ETGs using IFS observations from the SAMI galaxy survey, and integrated star-formation rates, stellar masses, and dust masses from the GAMA survey. Only 8% (4/49) of visually-classified ETGs are kinematically consistent with being dispersion-supported systems. These "dispersion-dominated galaxies" exhibit discrepancies between stellar and ionised gas kinematics, either offsets in the kinematic position angle or large differences in the rotational velocity, and are outliers in star-formation rate at a fixed dust mass compared to normal star-forming galaxies. These properties are suggestive of recent merger activity. The remaining 90% of dusty ETGs have low velocity dispersions and/or large circular velocities, typical of "rotation-dominated galaxies". These results, along with the general evidence of published works on X-ray emission in ETGs, suggest that they are unlikely to host hot, X-ray gas consistent with their low stellar mass when compared to dispersion-dominated galaxies. This means dust will be long lived and thus these galaxies do not require external scenarios for the origin of their dust content. |
author2 |
Swinburne University of Technology |
format |
Article in Journal/Newspaper |
author |
Bassett, Robert Bekki, K. Cortese, L. Couch, W. J. Sansom, A. E. van de Sande, J. Bryant, J. J. Foster, C. Croom, S. M. Brough, S. Sweet, S. M. Medling, A. M. Owers, M. S. Driver, S. P. Davies, L. J. M. Wong, O. I. Groves, B. A. Bland-Hawthorn, J. Richards, S. N. Goodwin, M. Konstantopoulos, I. S. Lawrence, J. S. |
spellingShingle |
Bassett, Robert Bekki, K. Cortese, L. Couch, W. J. Sansom, A. E. van de Sande, J. Bryant, J. J. Foster, C. Croom, S. M. Brough, S. Sweet, S. M. Medling, A. M. Owers, M. S. Driver, S. P. Davies, L. J. M. Wong, O. I. Groves, B. A. Bland-Hawthorn, J. Richards, S. N. Goodwin, M. Konstantopoulos, I. S. Lawrence, J. S. The SAMI galaxy survey: kinematics of dusty early-type galaxies |
author_facet |
Bassett, Robert Bekki, K. Cortese, L. Couch, W. J. Sansom, A. E. van de Sande, J. Bryant, J. J. Foster, C. Croom, S. M. Brough, S. Sweet, S. M. Medling, A. M. Owers, M. S. Driver, S. P. Davies, L. J. M. Wong, O. I. Groves, B. A. Bland-Hawthorn, J. Richards, S. N. Goodwin, M. Konstantopoulos, I. S. Lawrence, J. S. |
author_sort |
Bassett, Robert |
title |
The SAMI galaxy survey: kinematics of dusty early-type galaxies |
title_short |
The SAMI galaxy survey: kinematics of dusty early-type galaxies |
title_full |
The SAMI galaxy survey: kinematics of dusty early-type galaxies |
title_fullStr |
The SAMI galaxy survey: kinematics of dusty early-type galaxies |
title_full_unstemmed |
The SAMI galaxy survey: kinematics of dusty early-type galaxies |
title_sort |
sami galaxy survey: kinematics of dusty early-type galaxies |
publisher |
Oxford University Press (OUP) |
publishDate |
2017 |
url |
http://hdl.handle.net/1959.3/435911 https://doi.org/10.1093/mnras/stx1000 |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society, Vol. 470, no. 2 (Sep 2017), pp. 1991-2006 |
op_relation |
http://purl.org/au-research/grants/arc/DP130100664 http://purl.org/au-research/grants/arc/FL140100278 http://purl.org/au-research/grants/arc/FT100100457 http://purl.org/au-research/grants/arc/FT140101166 http://purl.org/au-research/grants/arc/FT140100255 http://hdl.handle.net/1959.3/435911 https://doi.org/10.1093/mnras/stx1000 |
op_rights |
Copyright © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. |
op_doi |
https://doi.org/10.1093/mnras/stx1000 |
container_title |
Monthly Notices of the Royal Astronomical Society |
container_volume |
470 |
container_issue |
2 |
container_start_page |
1991 |
op_container_end_page |
2006 |
_version_ |
1766184417248673792 |