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

Robert Bassett; K. Bekki; L. Cortese; W. J. Couch; A. E. Sansom; J. van de Sande; J. J. Bryant; C. Foster; S. M. Croom; S. Brough; S. M. Sweet; A. M. Medling; M. S. Owers; S. P. Driver; L. J. M. Davies; O. I. Wong; B. A. Groves; J. Bland-Hawthorn; S. N. Richards; M. Goodwin; I. S. Konstantopoulos; J. S. Lawrence

doi:10.1093/mnras/stx1000

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

Robert Bassett, K. Bekki, L. Cortese, W. J. Couch, A. E. Sansom, J. van de Sande, J. J. Bryant, C. Foster, S. M. Croom, S. Brough, S. M. Sweet, A. M. Medling, M. S. Owers, S. P. Driver, L. J. M. Davies, O. I. Wong, B. A. Groves, J. Bland-Hawthorn, S. N. Richards, M. GoodwinI. S. Konstantopoulos, J. S. Lawrence

School of Physics and Astronomy

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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 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.

Original language	English
Pages (from-to)	1991-2006
Journal	Monthly Notices of the Royal Astronomical Society
Volume	470
Issue number	2
Early online date	3 May 2017
DOIs	https://doi.org/10.1093/mnras/stx1000
Publication status	Published - Sept 2017

Keywords

Dust
Extinction
Galaxies: interactions
Galaxies: kinematics and dynamics

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Bassett-2017-SAMI-galaxy-survey-MNRAS-1991
© 2017, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stx1000
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http://arxiv.org/abs/1704.08433v1

SAMI Galaxy Survey
Bryant, J. J. (Creator), Owers, M. S. (Creator), Robotham, A. S. G. (Creator), Croom, S. M. (Creator), Driver, S. P. (Creator), Drinkwater, M. J. (Creator), Lorente, N. P. F. (Creator), Cortese, L. (Creator), Scott, N. (Creator), Colless, M. (Creator), Schaefer, A. (Creator), Taylor, E. N. (Creator), Konstantopoulos, I. S. (Creator), Allen, J. T. (Creator), Baldry, I. (Creator), Barnes, L. (Creator), Bauer, A. E. (Creator), Bland-Hawthorn, J. (Creator), Bloom, J. V. (Creator), Brooks, A. M. (Creator), Brough, S. (Creator), Cecil, G. (Creator), Couch, W. (Creator), Croton, D. (Creator), Davies, R. (Creator), Ellis, S. (Creator), Fogarty, L. M. R. (Creator), Foster, C. (Creator), Glazebrook, K. (Creator), Goodwin, M. (Creator), Green, A. (Creator), Gunawardhana, M. L. (Creator), Hampton, E. (Creator), Ho, I.-T. (Creator), Hopkins, A. M. (Creator), Kewley, L. (Creator), Lawrence, J. S. (Creator), Leon-Saval, S. G. (Creator), Leslie, S. (Creator), McElroy, R. (Creator), Lewis, G. (Creator), Liske, J. (Creator), Lopez-Sanchez, A. R. (Creator), Mahajan, S. (Creator), Medling, A. M. (Creator), Metcalfe, N. (Creator), Meyer, M. (Creator), Mould, J. (Creator), Obreschkow, D. (Creator), O'Toole, S. (Creator), Pracy, M. (Creator), Richards, S. N. (Creator), Shanks, T. (Creator), Sharp, R. (Creator), Sweet, S. M. (Creator), Thomas, A. D. (Creator), Tonini, C. (Creator) & Walcher, C. J. (Creator), SAMI Survey Team, 1 Mar 2015
https://sami-survey.org/ and one more link, https://datacentral.aao.gov.au/asvo/surveys/sami/ (show fewer)
Dataset

Cite this

Bassett, R., Bekki, K., Cortese, L., Couch, W. J., Sansom, A. E., Sande, J. V. D., 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., ... 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. https://doi.org/10.1093/mnras/stx1000

@article{bd6c10e10b0a455a83cf29172c7d7b25,

title = "The SAMI galaxy survey: kinematics of dusty early-type galaxies",

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 {\textquoteleft}dispersion-dominated galaxies{\textquoteright} 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 {\textquoteleft}rotation-dominated galaxies{\textquoteright}. 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.",

keywords = "Dust, Extinction, Galaxies: interactions, Galaxies: kinematics and dynamics",

author = "Robert Bassett and K. Bekki and L. Cortese and Couch, {W. J.} and Sansom, {A. E.} and Sande, {J. van de} and Bryant, {J. J.} and C. Foster and Croom, {S. M.} and S. Brough 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 J. Bland-Hawthorn and Richards, {S. N.} and M. Goodwin and Konstantopoulos, {I. S.} and Lawrence, {J. S.}",

year = "2017",

month = sep,

doi = "10.1093/mnras/stx1000",

language = "English",

volume = "470",

pages = "1991--2006",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "2",

}

Bassett, R, Bekki, K, Cortese, L, Couch, WJ, Sansom, AE, Sande, JVD, 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, pp. 1991-2006. https://doi.org/10.1093/mnras/stx1000

TY - JOUR

T1 - The SAMI galaxy survey

T2 - kinematics of dusty early-type galaxies

AU - Bassett, Robert

AU - Bekki, K.

AU - Cortese, L.

AU - Couch, W. J.

AU - Sansom, A. E.

AU - Sande, J. van de

AU - Bryant, J. J.

AU - Foster, C.

AU - Croom, S. M.

AU - Brough, S.

AU - Sweet, S. M.

AU - Medling, A. M.

AU - Owers, M. 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, I. S.

AU - Lawrence, J. S.

PY - 2017/9

Y1 - 2017/9

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 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.

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 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.

KW - Dust

KW - Extinction

KW - Galaxies: interactions

KW - Galaxies: kinematics and dynamics

U2 - 10.1093/mnras/stx1000

DO - 10.1093/mnras/stx1000

M3 - Article

SN - 0035-8711

VL - 470

SP - 1991

EP - 2006

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

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

Abstract

Keywords

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Datasets

SAMI Galaxy Survey

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