J/MNRAS/465/123 SAMI Galaxy Survey asymmetries (Bloom+, 2017)
The SAMI Galaxy Survey: asymmetry in gas kinematics and its links to
stellar mass and star formation.
Bloom J.V., Fogarty L.M.R., Croom S.M., Schaefer A., Bryant J.J.,
Cortese L., Richards S., Bland-Hawthorn J., Ho I.-T., Scott N.,
Goldstein G., Medling A., Brough S., Sweet S.M., Cecil G.,
Lopez-Sanchez A., Glazebrook K., Parker Q., Allen J.T., Goodwin M.,
Green A.W., Konstantopoulos I.S., Lawrence J.S., Lorente N., Owers M.S.,
Sharp R.
<Mon. Not. R. Astron. Soc., 465, 123-148 (2017)>
=2017MNRAS.465..123B 2017MNRAS.465..123B (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxy catalogs ; Morphology
Keywords: methods: data analysis - techniques: imaging spectroscopy -
galaxies: evolution - galaxies: interactions -
galaxies: kinematics and dynamics - galaxies: structure
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., 2011MNRAS.414.2923K 2011MNRAS.414.2923K). The approach, similar to the application
of kinemetry by Shapiro et al., uses ionized gas kinematics, probed by
Hα 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 0.5Re) and outer Hα equivalent
widths of asymmetric and normal galaxies shows a small but significant
increase in inner equivalent width for asymmetric galaxies.
Description:
The SAMI Galaxy Survey will consist of 3400 galaxies across a range of
stellar masses and environments, within 0.004<z<0.095 (Croom et al.,
2012MNRAS.421..872C 2012MNRAS.421..872C). The increased size of the survey sample is
possible within a relatively short time frame because the SAMI
instrument can take observations of up to 12 galaxies at a time (plus
one calibration star), greatly increasing the ease with which large
samples of IFS data can be obtained.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 87 361 GAMA catalog information
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See also:
J/MNRAS/413/971 : Galaxy And Mass Assembly (GAMA) DR1 (Driver+, 2011)
J/MNRAS/452/2087 : Galaxy And Mass Assembly (GAMA) DR2 (Liske+, 2015)
J/MNRAS/462/4336 : GAMA. Stellar mass budget (Moffett+, 2016)
J/MNRAS/446/1567 : SAMI Galaxy Survey: EDR (Allen+, 2015)
J/MNRAS/454/2050 : SAMI Pilot Survey (Fogarty+, 2015)
J/MNRAS/456/1299 : SAMI Galaxy Survey: gas streaming (Cecil+, 2016)
J/ApJ/835/104 : SAMI Galaxy Survey: rotators classification
(van de Sande+, 2017)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [GAMA] GAMA
5- 10 I6 --- GAMA GAMA identification number
13- 21 A9 --- VisClass Visual classification (1)
24- 32 A9 --- KinClass Kinematical classification (1)
34- 38 F5.3 --- vasym Median asymmetry in velocity
40- 45 F6.4 --- e_vasym rms uncertainty on vasym
47- 51 F5.3 --- sigmaasym Median asymmetry in velocity dispersion
53- 57 F5.3 --- e_sigmaasym rms uncertainty on sigmaasym
59- 63 F5.2 [Msun] logM* Stellar mass (2)
65- 68 F4.2 mag u-r u-r colour index (2)
70- 77 F8.3 [Msun/yr] log(SFR) ?=-999.00 Star formation rate (3)
80- 87 F8.3 --- r50Ha/cont ?=-999.00 Radius ratio,
r50,Ha/t50,cont (3)
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Note (1): The asymmetry cutoff derived in this work is vasym>0.065, with
galaxies above the cutoff having kinemetric classification 'asymmetric'
and those below it being 'normal'.
Note (2): GAMA Survey catalogue values for stellar mass (Taylor et al.,
2011MNRAS.418.1587T 2011MNRAS.418.1587T) and colour from (Hill et al., 2011MNRAS.412..765H 2011MNRAS.412..765H).
Note (3): SAMI Galaxy Survey values for SFR and r50,Ha/r50,cont
(Schaefer et al., 2017MNRAS.464..121S 2017MNRAS.464..121S).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Jun-2018