J/MNRAS/491/324 SAMI galaxies' spin-ellipticity radial tracks (Rawlings+, 2020)
The SAMI Galaxy Survey:
rules of behaviour for spin-ellipticity radial tracks in galaxies.
Rawlings A., Foster C., van de Sande J., Taranu D.S., Croom S.M.,
Bland-Hawthorn J., Brough S., Bryant J.J., Colless M., Lagos C.D.P.,
Konstantopoulos I.S., Lawrence J.S., Lopez-Sanchez A.R., Lorente N.P.F.,
Medling A.M., Oh S., Owers M.S., Richards S.N., Scott N., Sweet S.M.,
Yi S.K.
<Mon. Not. R. Astron. Soc., 491, 324-343 (2020)>
=2020MNRAS.491..324R 2020MNRAS.491..324R (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, optical ; Galaxy catalogs ; Morphology
Keywords: galaxies: kinematics and dynamics - galaxies: photometry -
galaxies: structure
Abstract:
We study the behaviour of the spin-ellipticity radial tracks for 507
galaxies from the Sydney AAO Multiobject Integral Field (SAMI) Galaxy
Survey with stellar kinematics out to ≥1.5Re. We advocate for a
morpho-dynamical classification of galaxies, relying on spatially
resolved photometric and kinematic data. We find the use of
spin-ellipticity radial tracks is valuable in identifying
substructures within a galaxy, including embedded and counter-rotating
discs, that are easily missed in unilateral studies of the photometry
alone. Conversely, bars are rarely apparent in the stellar kinematics
but are readily identified on images. Consequently, we distinguish the
spin-ellipticity radial tracks of seven morpho-dynamical types:
elliptical, lenticular, early spiral, late spiral, barred spiral,
embedded disc, and 2σ galaxies. The importance of probing beyond
the inner radii of galaxies is highlighted by the characteristics of
galactic features in the spin-ellipticity radial tracks present at
larger radii. The density of information presented through
spin-ellipticity radial tracks emphasizes a clear advantage to
representing galaxies as a track, rather than a single point, in
spin-ellipticity parameter space.
Description:
We use Sydney AAO Multi-object Integral Field (SAMI; Croom et al.
2012MNRAS.421..872C 2012MNRAS.421..872C) spectrograph data obtained as part of the SAMI
Galaxy Survey (Bryant et al. 2015MNRAS.447.2857B 2015MNRAS.447.2857B; Owers et al.
2017MNRAS.468.1824O 2017MNRAS.468.1824O).
The final SAMI Galaxy Survey sample contains ∼3000 low-redshift
(0.004=<z=<0.095) galaxies with a step-wise redshift-dependent stellar
mass selection. The details of the SAMI target selection for the
Galaxy And Mass Assembly (GAMA; Driver et al. 2011MNRAS.413..971D 2011MNRAS.413..971D,
Cat. J/MNRAS/413/971) fields and the cluster samples are discussed by
Bryant et al. (2015MNRAS.447.2857B 2015MNRAS.447.2857B) and Owers et al.
(2017MNRAS.468.1824O 2017MNRAS.468.1824O), respectively.
Our sample selection follows van de Sande et al. (2017ApJ...835..104V 2017ApJ...835..104V,
Cat. J/ApJ/835/104) and Foster et al. (2018MNRAS.480.3105F 2018MNRAS.480.3105F), but only
includes the GAMA sample of the SAMI Galaxy Survey. We do not include
the cluster sample because the imaging quality is not suitable for our
analysis. We select from GAMA galaxies included in the internal team
release version v0.11. First, galaxies with no spaxels satisfying
Verror<30km/s and σerror<0.1σ+25km/s are discarded. We
further require that the spatial resolution or half width at
half-maximum (HWHM) of the SAMI data not exceed 1Re.
We study the use of spin-ellipticity radial tracks as a
morpho-dynamical approach to classifying galaxies for 507 SAMI
galaxies with stellar kinematics out to 1.5Re. Table C1. The
catalogue ID, SDSS classification, HSC/KiDS classification, and the
spin-ellipticity radial track classification for each of the outlying
galaxies is presented in Table C1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 55 529 Classification of SAMI Galaxies with stellar
kinematics out to at least 1.5Re
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See also:
J/MNRAS/413/971 : Galaxy And Mass Assembly (GAMA) DR1 (Driver+, 2011)
Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- ID [7289/3897281] SAMI galaxy identifier
(GAMA NNNNNNN in Simbad)
9- 13 A5 --- cSDSS Original classification from SDSS (1)
15- 21 A7 --- cHSC/KiDS Classification from higher resolution HSC or
KiDS data (2)
23- 35 A13 --- cspinell Classification from the spin-ellipticity
radial tracks (3)
37- 55 A19 --- kinematic Kinematic features
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Note (1): SDSS classification as follows:
? = Classification not possible (19/529)
E = Elliptical galaxy (55/529)
E/S0 = E/S0 galaxy (65/529)
S0 = Lenticular galaxy (111/529)
S0/eS = S0/eS galaxy (108/529)
eS = Early-type spiral galaxy (91/529)
eS/lS = eS/lS galaxy (45/529)
lS = Late-type spiral galaxy (35/529)
Note (2): HSC or KiDS classification as follows:
? = Classification not possible (19/529)
E = Elliptical galaxy (55/529)
E/S0 = E/S0 galaxy (63/529)
Merger = Merger galaxy (2/529)
Merger? = Possible merger (1/529)
S0 = Lenticular galaxy (108/529)
S0/eS = S0/eS galaxy (107/529)
eS = Early-type spiral galaxy (85/529)
eS/lS = eS/lS galaxy (44/529)
eSB = Early barred spiral galaxy (10/529)
lS = Late-type spiral galaxy (35/529)
Note (3): Spin-ellipticity radial tracks classification as follows:
2-Sigma = Counter-rotating disc galaxy (3/529)
? = Classification not possible (32/529)
E = Elliptical galaxy (100/529)
E/S0 = /S0 galaxy (11/529)
E? = Possible elliptical galaxy (1/529)
ES = Embedded disc galaxy where the disc dominates the flux within
the inner radii (1/529)
Embedded Disc = Embedded Disc galaxy (4/529)
S0 = Lenticular galaxy (147/529)
S0/eS = S0/eS galaxy (31/529)
eS = Early-type spiral galaxy (127/529)
eS/S0 = eS/S0 galaxy (1/529)
eS/lS = eS/lS galaxy (10/529)
eSB = Early barred spiral galaxy (10/529)
lS = Late-type spiral galaxy (51/529)
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 09-Feb-2023