The SAMI Galaxy Survey: asymmetry in gas kinematics and its links to stellar mass and star formation

J. Bloom; L. M R Fogarty; S. M. Croom; A. L. Schaefer; J. J. Bryant; L. Cortese; S. N. Richards; Joss Bland-Hawthorn; I. T. Ho; N. Scott; Gregory Goldstein; A. M. Medling; Sarah Brough; S. M. Sweet; G. N. Cecil; Angel Lopez Sanchez; K. Glazebrook; Quentin Parker; J. T. Allen; M. Goodwin; A. W. Green; Iraklis S. Konstantopoulos; J. S. Lawrence; N. P F Lorente; Matt Owers; R. Sharp

doi:10.1093/mnras/stw2605

The SAMI Galaxy Survey: asymmetry in gas kinematics and its links to stellar mass and star formation

J. Bloom, L. M R Fogarty, S. M. Croom, A. L. Schaefer, J. J. Bryant, L. Cortese, S. N. Richards, Joss Bland-Hawthorn, I. T. Ho, N. Scott, Gregory Goldstein, A. M. Medling, Sarah Brough, S. M. Sweet, G. N. Cecil, Angel Lopez Sanchez, K. Glazebrook, Quentin Parker, J. T. Allen, M. GoodwinA. W. Green, Iraklis S. Konstantopoulos, J. S. Lawrence, N. P F Lorente, Matt Owers, R. Sharp

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Abstract

We study the properties of kinematically disturbed galaxies in the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey using a quantitative criterion, based on kinemetry (Krajnovic et al.). The approach, similar to the application of kinemetry by Shapiro et al., uses ionized gas kinematics, probed by Ha emission. By this method, 23 +/- 7 per cent of our 360-galaxy sub-sample of the SAMI Galaxy Survey are kinematically asymmetric. Visual classifications agree with our kinemetric results for 90 per cent of asymmetric and 95 per cent of normal galaxies. We find that stellar mass and kinematic asymmetry are inversely correlated and that kinematic asymmetry is both more frequent and stronger in low-mass galaxies. This builds on previous studies that found high fractions of kinematic asymmetry in low-mass galaxies using a variety of different methods. Concentration of star formation and kinematic disturbance are found to be correlated, confirming results found in previous work. This effect is stronger for high-mass galaxies (log(M-*) > 10) and indicates that kinematic disturbance is linked to centrally concentrated star formation. Comparison of the inner (within 0.5R(e)) and outer Ha equivalent widths of asymmetric and normal galaxies shows a small but significant increase in inner equivalent width for asymmetric galaxies.

Original language	English
Pages (from-to)	123-148
Number of pages	26
Journal	Monthly Notices of the Royal Astronomical Society
Volume	465
Issue number	1
Early online date	12 Oct 2016
DOIs	https://doi.org/10.1093/mnras/stw2605
Publication status	Published - 11 Feb 2017

Bibliographical note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Keywords

methods: data analysis
techniques: imaging spectroscopy
galaxies: evolution
galaxies: interactions
galaxies: kinematics and dynamics
galaxies: structure

Access to Document

10.1093/mnras/stw2605

Publisher version (open access)Final published version, 3.46 MBLicence: Unspecified

Cite this

Bloom, J., Fogarty, L. M. R., Croom, S. M., Schaefer, A. L., Bryant, J. J., Cortese, L., Richards, S. N., Bland-Hawthorn, J., Ho, I. T., Scott, N., Goldstein, G., Medling, A. M., Brough, S., Sweet, S. M., Cecil, G. N., Lopez Sanchez, A., Glazebrook, K., Parker, Q., Allen, J. T., ... Sharp, R. (2017). The SAMI Galaxy Survey: asymmetry in gas kinematics and its links to stellar mass and star formation. Monthly Notices of the Royal Astronomical Society, 465(1), 123-148. https://doi.org/10.1093/mnras/stw2605

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title = "The SAMI Galaxy Survey: asymmetry in gas kinematics and its links to stellar mass and star formation",

abstract = "We study the properties of kinematically disturbed galaxies in the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey using a quantitative criterion, based on kinemetry (Krajnovic et al.). The approach, similar to the application of kinemetry by Shapiro et al., uses ionized gas kinematics, probed by Ha emission. By this method, 23 +/- 7 per cent of our 360-galaxy sub-sample of the SAMI Galaxy Survey are kinematically asymmetric. Visual classifications agree with our kinemetric results for 90 per cent of asymmetric and 95 per cent of normal galaxies. We find that stellar mass and kinematic asymmetry are inversely correlated and that kinematic asymmetry is both more frequent and stronger in low-mass galaxies. This builds on previous studies that found high fractions of kinematic asymmetry in low-mass galaxies using a variety of different methods. Concentration of star formation and kinematic disturbance are found to be correlated, confirming results found in previous work. This effect is stronger for high-mass galaxies (log(M-*) > 10) and indicates that kinematic disturbance is linked to centrally concentrated star formation. Comparison of the inner (within 0.5R(e)) and outer Ha equivalent widths of asymmetric and normal galaxies shows a small but significant increase in inner equivalent width for asymmetric galaxies.",

keywords = "methods: data analysis, techniques: imaging spectroscopy, galaxies: evolution, galaxies: interactions, galaxies: kinematics and dynamics, galaxies: structure",

author = "J. Bloom and Fogarty, {L. M R} and Croom, {S. M.} and Schaefer, {A. L.} and Bryant, {J. J.} and L. Cortese and Richards, {S. N.} and Joss Bland-Hawthorn and Ho, {I. T.} and N. Scott and Gregory Goldstein and Medling, {A. M.} and Sarah Brough and Sweet, {S. M.} and Cecil, {G. N.} and {Lopez Sanchez}, Angel and K. Glazebrook and Quentin Parker and Allen, {J. T.} and M. Goodwin and Green, {A. W.} and Konstantopoulos, {Iraklis S.} and Lawrence, {J. S.} and Lorente, {N. P F} and Matt Owers and R. Sharp",

note = "This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society {\textcopyright}: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.",

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doi = "10.1093/mnras/stw2605",

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Bloom, J, Fogarty, LMR, Croom, SM, Schaefer, AL, Bryant, JJ, Cortese, L, Richards, SN, Bland-Hawthorn, J, Ho, IT, Scott, N, Goldstein, G, Medling, AM, Brough, S, Sweet, SM, Cecil, GN, Lopez Sanchez, A, Glazebrook, K, Parker, Q, Allen, JT, Goodwin, M, Green, AW, Konstantopoulos, IS, Lawrence, JS, Lorente, NPF, Owers, M & Sharp, R 2017, 'The SAMI Galaxy Survey: asymmetry in gas kinematics and its links to stellar mass and star formation', Monthly Notices of the Royal Astronomical Society, vol. 465, no. 1, pp. 123-148. https://doi.org/10.1093/mnras/stw2605

TY - JOUR

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T2 - asymmetry in gas kinematics and its links to stellar mass and star formation

AU - Bloom, J.

AU - Fogarty, L. M R

AU - Croom, S. M.

AU - Schaefer, A. L.

AU - Bryant, J. J.

AU - Cortese, L.

AU - Richards, S. N.

AU - Bland-Hawthorn, Joss

AU - Ho, I. T.

AU - Scott, N.

AU - Goldstein, Gregory

AU - Medling, A. M.

AU - Brough, Sarah

AU - Sweet, S. M.

AU - Cecil, G. N.

AU - Lopez Sanchez, Angel

AU - Glazebrook, K.

AU - Parker, Quentin

AU - Allen, J. T.

AU - Goodwin, M.

AU - Green, A. W.

AU - Konstantopoulos, Iraklis S.

AU - Lawrence, J. S.

AU - Lorente, N. P F

AU - Owers, Matt

AU - Sharp, R.

N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

PY - 2017/2/11

Y1 - 2017/2/11

N2 - We study the properties of kinematically disturbed galaxies in the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey using a quantitative criterion, based on kinemetry (Krajnovic et al.). The approach, similar to the application of kinemetry by Shapiro et al., uses ionized gas kinematics, probed by Ha emission. By this method, 23 +/- 7 per cent of our 360-galaxy sub-sample of the SAMI Galaxy Survey are kinematically asymmetric. Visual classifications agree with our kinemetric results for 90 per cent of asymmetric and 95 per cent of normal galaxies. We find that stellar mass and kinematic asymmetry are inversely correlated and that kinematic asymmetry is both more frequent and stronger in low-mass galaxies. This builds on previous studies that found high fractions of kinematic asymmetry in low-mass galaxies using a variety of different methods. Concentration of star formation and kinematic disturbance are found to be correlated, confirming results found in previous work. This effect is stronger for high-mass galaxies (log(M-*) > 10) and indicates that kinematic disturbance is linked to centrally concentrated star formation. Comparison of the inner (within 0.5R(e)) and outer Ha equivalent widths of asymmetric and normal galaxies shows a small but significant increase in inner equivalent width for asymmetric galaxies.

AB - We study the properties of kinematically disturbed galaxies in the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey using a quantitative criterion, based on kinemetry (Krajnovic et al.). The approach, similar to the application of kinemetry by Shapiro et al., uses ionized gas kinematics, probed by Ha emission. By this method, 23 +/- 7 per cent of our 360-galaxy sub-sample of the SAMI Galaxy Survey are kinematically asymmetric. Visual classifications agree with our kinemetric results for 90 per cent of asymmetric and 95 per cent of normal galaxies. We find that stellar mass and kinematic asymmetry are inversely correlated and that kinematic asymmetry is both more frequent and stronger in low-mass galaxies. This builds on previous studies that found high fractions of kinematic asymmetry in low-mass galaxies using a variety of different methods. Concentration of star formation and kinematic disturbance are found to be correlated, confirming results found in previous work. This effect is stronger for high-mass galaxies (log(M-*) > 10) and indicates that kinematic disturbance is linked to centrally concentrated star formation. Comparison of the inner (within 0.5R(e)) and outer Ha equivalent widths of asymmetric and normal galaxies shows a small but significant increase in inner equivalent width for asymmetric galaxies.

KW - methods: data analysis

KW - techniques: imaging spectroscopy

KW - galaxies: evolution

KW - galaxies: interactions

KW - galaxies: kinematics and dynamics

KW - galaxies: structure

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UR - http://purl.org/au-research/grants/arc/CE1101020

UR - http://purl.org/au-research/grants/arc/FT100100457

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DO - 10.1093/mnras/stw2605

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

The SAMI Galaxy Survey: asymmetry in gas kinematics and its links to stellar mass and star formation

Abstract

Bibliographical note

Keywords

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The impact of impact: what stops star formation in cluster galaxies?

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The SAMI Galaxy Survey: asymmetry in gas kinematics and its links to stellar mass and star formation

Abstract

Bibliographical note

Keywords

Access to Document

Other files and links

Fingerprint

Projects

The impact of impact: what stops star formation in cluster galaxies?

Cite this