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 haloes of these galaxies are expecte...
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ftcaltechauth:oai:authors.library.caltech.edu:jyrtm-9j142 2024-09-15T18:33:25+00:00 The SAMI Galaxy Survey: kinematics of dusty early-type galaxies Bassett, R. 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. 2017-09 https://doi.org/10.1093/mnras/stx1000 unknown Royal Astronomical Society https://arxiv.org/abs/1704.08433 https://doi.org/10.1093/mnras/stx1000 oai:authors.library.caltech.edu:jyrtm-9j142 eprintid:80845 resolverid:CaltechAUTHORS:20170828-110629696 info:eu-repo/semantics/openAccess Other Monthly Notices of the Royal Astronomical Society, 470(2), 1991-2006, (2017-09) dust extinction – galaxies: interactions – galaxies: kinematics and dynamics info:eu-repo/semantics/article 2017 ftcaltechauth https://doi.org/10.1093/mnras/stx1000 2024-08-06T15:34:58Z 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 haloes of these galaxies are expected to destroy dust in ∼10^7 yr (or less). This has sparked a debate regarding the origin of the dust: Is it internally produced by asymptotic giant branch stars, or is it accreted externally through mergers? We examine the 2D stellar and ionized gas kinematics of dusty ETGs using integral field spectroscopy observations from the SAMI Galaxy Survey, and integrated star formation rates, stellar masses and dust masses from the GAMA survey. Only 8 per cent (4/49) of visually classified ETGs are kinematically consistent with being dispersion-supported systems. These 'dispersion-dominated galaxies' exhibit discrepancies between stellar and ionized 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 per cent 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 M* when compared to dispersion-dominated galaxies. This means that dust will be long-lived and thus these galaxies do not require external scenarios for the origin of their dust content. © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 April 21. Received 2017 April 14; in original form 2016 December 11. Published: 03 May 2017. RB acknowledges support under the Australian Research Council's (ARC) Discovery Projects ... Article in Journal/Newspaper sami Caltech Authors (California Institute of Technology) Monthly Notices of the Royal Astronomical Society 470 2 1991 2006 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
unknown |
topic |
dust extinction – galaxies: interactions – galaxies: kinematics and dynamics |
spellingShingle |
dust extinction – galaxies: interactions – galaxies: kinematics and dynamics Bassett, R. 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 |
topic_facet |
dust extinction – galaxies: interactions – galaxies: kinematics and dynamics |
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 haloes of these galaxies are expected to destroy dust in ∼10^7 yr (or less). This has sparked a debate regarding the origin of the dust: Is it internally produced by asymptotic giant branch stars, or is it accreted externally through mergers? We examine the 2D stellar and ionized gas kinematics of dusty ETGs using integral field spectroscopy observations from the SAMI Galaxy Survey, and integrated star formation rates, stellar masses and dust masses from the GAMA survey. Only 8 per cent (4/49) of visually classified ETGs are kinematically consistent with being dispersion-supported systems. These 'dispersion-dominated galaxies' exhibit discrepancies between stellar and ionized 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 per cent 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 M* when compared to dispersion-dominated galaxies. This means that dust will be long-lived and thus these galaxies do not require external scenarios for the origin of their dust content. © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 April 21. Received 2017 April 14; in original form 2016 December 11. Published: 03 May 2017. RB acknowledges support under the Australian Research Council's (ARC) Discovery Projects ... |
format |
Article in Journal/Newspaper |
author |
Bassett, R. 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_facet |
Bassett, R. 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, R. |
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 |
Royal Astronomical Society |
publishDate |
2017 |
url |
https://doi.org/10.1093/mnras/stx1000 |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society, 470(2), 1991-2006, (2017-09) |
op_relation |
https://arxiv.org/abs/1704.08433 https://doi.org/10.1093/mnras/stx1000 oai:authors.library.caltech.edu:jyrtm-9j142 eprintid:80845 resolverid:CaltechAUTHORS:20170828-110629696 |
op_rights |
info:eu-repo/semantics/openAccess Other |
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_ |
1810475121972871168 |