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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Online Access: | https://clok.uclan.ac.uk/19222/ https://clok.uclan.ac.uk/19222/1/stx1000.pdf https://doi.org/10.1093/mnras/stx1000 |
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ftunivclancas:oai:clok.uclan.ac.uk:19222 2024-05-12T08:10:34+00:00 The SAMI Galaxy Survey: kinematics of dusty early-type galaxies Bassett, R. Bekki, K. Cortese, L. Couch, W. J. Sansom, Anne 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. 2017-05-03 application/pdf https://clok.uclan.ac.uk/19222/ https://clok.uclan.ac.uk/19222/1/stx1000.pdf https://doi.org/10.1093/mnras/stx1000 en eng Oxford University Press (OUP) https://clok.uclan.ac.uk/19222/1/stx1000.pdf Bassett, R., Bekki, K., Cortese, L., Couch, W. J., Sansom, Anne E orcid iconorcid:0000-0002-2782-7388 , van de Sande, J., Bryant, J. J., Foster, C., Croom, S. M. et al (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 cc_by_nc_nd_4 F500 - Astronomy Article PeerReviewed 2017 ftunivclancas https://doi.org/10.1093/mnras/stx1000 2024-04-17T14:23:14Z 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 ∼107 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 University of Central Lancashire: CLOK - Central Lancashire Online Knowledge Monthly Notices of the Royal Astronomical Society 470 2 1991 2006 |
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University of Central Lancashire: CLOK - Central Lancashire Online Knowledge |
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ftunivclancas |
language |
English |
topic |
F500 - Astronomy |
spellingShingle |
F500 - Astronomy Bassett, R. Bekki, K. Cortese, L. Couch, W. J. Sansom, Anne 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 |
F500 - Astronomy |
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 ∼107 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. |
format |
Article in Journal/Newspaper |
author |
Bassett, R. Bekki, K. Cortese, L. Couch, W. J. Sansom, Anne 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, Anne 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 |
Oxford University Press (OUP) |
publishDate |
2017 |
url |
https://clok.uclan.ac.uk/19222/ https://clok.uclan.ac.uk/19222/1/stx1000.pdf https://doi.org/10.1093/mnras/stx1000 |
genre |
sami |
genre_facet |
sami |
op_relation |
https://clok.uclan.ac.uk/19222/1/stx1000.pdf Bassett, R., Bekki, K., Cortese, L., Couch, W. J., Sansom, Anne E orcid iconorcid:0000-0002-2782-7388 , van de Sande, J., Bryant, J. J., Foster, C., Croom, S. M. et al (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 |
op_rights |
cc_by_nc_nd_4 |
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_ |
1798854042093355008 |