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:80845 2023-05-15T18:11:51+02:00 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 application/pdf https://authors.library.caltech.edu/80845/ https://authors.library.caltech.edu/80845/1/stx1000.pdf https://authors.library.caltech.edu/80845/2/1704.08433.pdf https://resolver.caltech.edu/CaltechAUTHORS:20170828-110629696 en eng Royal Astronomical Society https://authors.library.caltech.edu/80845/1/stx1000.pdf https://authors.library.caltech.edu/80845/2/1704.08433.pdf Bassett, R. and Bekki, K. and Cortese, L. and Couch, W. J. and Sansom, A. E. and van de Sande, J. and Bryant, J. J. and Foster, C. and Croom, S. M. and Brough, S. and Sweet, S. M. and Medling, A. M. and Owers, M. S. and Driver, S. P. and Davies, L. J. M. and Wong, O. I. and Groves, B. A. and Bland-Hawthorn, J. and Richards, S. N. and Goodwin, M. and Konstantopoulos, I. S. and Lawrence, J. S. (2017) The SAMI Galaxy Survey: kinematics of dusty early-type galaxies. Monthly Notices of the Royal Astronomical Society, 470 (2). pp. 1991-2006. ISSN 0035-8711. doi:10.1093/mnras/stx1000. https://resolver.caltech.edu/CaltechAUTHORS:20170828-110629696 <https://resolver.caltech.edu/CaltechAUTHORS:20170828-110629696> other Article PeerReviewed 2017 ftcaltechauth https://doi.org/10.1093/mnras/stx1000 2021-11-18T18:43:30Z 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. Article in Journal/Newspaper sami Caltech Authors (California Institute of Technology) Monthly Notices of the Royal Astronomical Society 470 2 1991 2006 |
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Caltech Authors (California Institute of Technology) |
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language |
English |
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. |
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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. |
spellingShingle |
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 |
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://authors.library.caltech.edu/80845/ https://authors.library.caltech.edu/80845/1/stx1000.pdf https://authors.library.caltech.edu/80845/2/1704.08433.pdf https://resolver.caltech.edu/CaltechAUTHORS:20170828-110629696 |
genre |
sami |
genre_facet |
sami |
op_relation |
https://authors.library.caltech.edu/80845/1/stx1000.pdf https://authors.library.caltech.edu/80845/2/1704.08433.pdf Bassett, R. and Bekki, K. and Cortese, L. and Couch, W. J. and Sansom, A. E. and van de Sande, J. and Bryant, J. J. and Foster, C. and Croom, S. M. and Brough, S. and Sweet, S. M. and Medling, A. M. and Owers, M. S. and Driver, S. P. and Davies, L. J. M. and Wong, O. I. and Groves, B. A. and Bland-Hawthorn, J. and Richards, S. N. and Goodwin, M. and Konstantopoulos, I. S. and Lawrence, J. S. (2017) The SAMI Galaxy Survey: kinematics of dusty early-type galaxies. Monthly Notices of the Royal Astronomical Society, 470 (2). pp. 1991-2006. ISSN 0035-8711. doi:10.1093/mnras/stx1000. https://resolver.caltech.edu/CaltechAUTHORS:20170828-110629696 <https://resolver.caltech.edu/CaltechAUTHORS:20170828-110629696> |
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other |
op_doi |
https://doi.org/10.1093/mnras/stx1000 |
container_title |
Monthly Notices of the Royal Astronomical Society |
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470 |
container_issue |
2 |
container_start_page |
1991 |
op_container_end_page |
2006 |
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1766184470226927616 |