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25 April 2024

» arxiv » 1610.2773

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The SAMI Galaxy Survey: Asymmetry in Gas Kinematics and its links to Stellar Mass and Star Formation
J. V. Bloom ; L. M. R. Fogarty ; S. M. Croom ; A. Schaefer ; J. J. Bryant ; L. Cortese ; S. Richards ; J. Bland-Hawthorn ; I-T. Ho ; N. Scott ; G. Goldstein ; A. Medling ; S. Brough ; S.M. Sweet ; G. Cecil ; A. Lopez-Sanchez ; K. Glazebrook ; Q. Parker ; J. T. Allen ; M. Goodwin ; A. W. Green ; I. S. Konstantopoulos ; J. S. Lawrence ; N. Lorente ; M. S. Owers ; R. Sharp ;
Date:	10 Oct 2016
Abstract:	We study the properties of kinematically disturbed galaxies in the 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 ionised gas kinematics, probed by H{alpha} emission. By this method 23+/-7% of our 360-galaxy sub-sample of the SAMI Galaxy Survey are kinematically asymmetric. Visual classifications agree with our kinemetric results for 90% of asymmetric and 95% of normal galaxies. We find 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 forma- tion 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 0.5Re) and outer H{alpha} equivalent widths of asymmetric and normal galaxies shows a small but significant increase in inner equivalent width for asymmetric galaxies.
Source:	arXiv, 1610.2773
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