The SAMI galaxy survey: Kinematics of dusty early-type galaxies

R. Bassett, K. Bekki, L. Cortese, Warrick J. Couch, A.E. Sansom, J. Van De Sande, J. J. Bryant, C. Foster, S. M. Croom, S. Brough, Sarah M. Sweet, Anne M. Medling, Matt S. Owers, S. P. Driver, L. J.M. Davies, O. I. Wong, B. A. Groves, J. Bland-Hawthorn, S. N. Richards, M. Goodwin & 2 others Iraklis S. Konstantopoulos, J. S. Lawrence

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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 dispersiondominated 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.

Original languageEnglish
Article numberstx1000
Pages (from-to)1991-2006
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume470
Issue number2
DOIs
Publication statusPublished - 11 Sep 2017

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kinematics
galaxies
dust
merger
gas
ionized gases
star formation rate
outlier
peculiar galaxies
gases
x rays
asymptotic giant branch stars
spectroscopy
stellar mass
low speed
halos
telescopes
stars

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Bassett, R., Bekki, K., Cortese, L., Couch, W. J., Sansom, A. E., Van De Sande, J., ... Lawrence, J. S. (2017). The SAMI galaxy survey: Kinematics of dusty early-type galaxies. Monthly Notices of the Royal Astronomical Society, 470(2), 1991-2006. [stx1000]. https://doi.org/10.1093/mnras/stx1000
Bassett, R. ; Bekki, K. ; Cortese, L. ; Couch, Warrick J. ; Sansom, A.E. ; Van De Sande, J. ; Bryant, J. J. ; Foster, C. ; Croom, S. M. ; Brough, S. ; Sweet, Sarah M. ; Medling, Anne M. ; Owers, Matt S. ; Driver, S. P. ; Davies, L. J.M. ; Wong, O. I. ; Groves, B. A. ; Bland-Hawthorn, J. ; Richards, S. N. ; Goodwin, M. ; Konstantopoulos, Iraklis S. ; Lawrence, J. S. / The SAMI galaxy survey : Kinematics of dusty early-type galaxies. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 470, No. 2. pp. 1991-2006.
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abstract = "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 dispersiondominated 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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Bassett, R, Bekki, K, Cortese, L, Couch, WJ, Sansom, AE, Van De Sande, J, Bryant, JJ, Foster, C, Croom, SM, Brough, S, Sweet, SM, Medling, AM, Owers, MS, Driver, SP, Davies, LJM, Wong, OI, Groves, BA, Bland-Hawthorn, J, Richards, SN, Goodwin, M, Konstantopoulos, IS & Lawrence, JS 2017, 'The SAMI galaxy survey: Kinematics of dusty early-type galaxies' Monthly Notices of the Royal Astronomical Society, vol. 470, no. 2, stx1000, pp. 1991-2006. https://doi.org/10.1093/mnras/stx1000

The SAMI galaxy survey : Kinematics of dusty early-type galaxies. / Bassett, R.; Bekki, K.; Cortese, L.; Couch, Warrick J.; Sansom, A.E.; Van De Sande, J.; Bryant, J. J.; Foster, C.; Croom, S. M.; Brough, S.; Sweet, Sarah M.; Medling, Anne M.; Owers, Matt S.; Driver, S. P.; Davies, L. J.M.; Wong, O. I.; Groves, B. A.; Bland-Hawthorn, J.; Richards, S. N.; Goodwin, M.; Konstantopoulos, Iraklis S.; Lawrence, J. S.

In: Monthly Notices of the Royal Astronomical Society, Vol. 470, No. 2, stx1000, 11.09.2017, p. 1991-2006.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The SAMI galaxy survey

T2 - Kinematics of dusty early-type galaxies

AU - Bassett, R.

AU - Bekki, K.

AU - Cortese, L.

AU - Couch, Warrick J.

AU - Sansom, A.E.

AU - Van De Sande, J.

AU - Bryant, J. J.

AU - Foster, C.

AU - Croom, S. M.

AU - Brough, S.

AU - Sweet, Sarah M.

AU - Medling, Anne M.

AU - Owers, Matt S.

AU - Driver, S. P.

AU - Davies, L. J.M.

AU - Wong, O. I.

AU - Groves, B. A.

AU - Bland-Hawthorn, J.

AU - Richards, S. N.

AU - Goodwin, M.

AU - Konstantopoulos, Iraklis S.

AU - Lawrence, J. S.

PY - 2017/9/11

Y1 - 2017/9/11

N2 - 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 dispersiondominated 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.

AB - 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 dispersiondominated 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.

KW - Dust, extinction

KW - Galaxies: interactions

KW - Galaxies: kinematics and dynamics

UR - http://www.scopus.com/inward/record.url?scp=85023752059&partnerID=8YFLogxK

U2 - 10.1093/mnras/stx1000

DO - 10.1093/mnras/stx1000

M3 - Article

VL - 470

SP - 1991

EP - 2006

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

M1 - stx1000

ER -