J/MNRAS/454/2050 SAMI Pilot Survey (Fogarty+, 2015)
The SAMI Pilot Survey: stellar kinematics of galaxies in Abell 85, 168 and 2399.
Fogarty L.M.R., Scott N., Owers M.S., Croom S.M., Bekki K.,
Houghton R.C.W., van de Sande J., D'Eugenio F., Cecil G.N., Colless M.M.,
Bland-Hawthorn J., Brough S., Cortese L., Davies R.L., Jones D.H.,
Pracy M., Allen J.T., Bryant J.J., Goodwin M., Green A.W.,
Konstantopoulos I.S., Lawrence J.S., Lorente N.P.F., Richards S.,
Sharp R.G.
<Mon. Not. R. Astron. Soc., 454, 2050-2066 (2015)>
=2015MNRAS.454.2050F 2015MNRAS.454.2050F (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxy catalogs ; Morphology
Keywords: techniques: imaging spectroscopy - galaxies: kinematics and dynamics
Abstract:
We present the SAMI Pilot Survey, consisting of integral field
spectroscopy of 106 galaxies across three galaxy clusters, Abell 85,
Abell 168 and Abell 2399. The galaxies were selected by absolute
magnitude to have Mr←20.25mag. The survey, using the Sydney-AAO
Multi-object Integral field spectrograph (SAMI), comprises
observations of galaxies of all morphological types with 75 per cent
of the sample being early-type galaxies (ETGs) and 25 per cent being
late-type galaxies (LTGs). Stellar velocity and velocity dispersion
maps are derived for all 106 galaxies in the sample. The λR
parameter, a proxy for the specific stellar angular momentum, is
calculated for each galaxy in the sample. We find a trend between
λR and galaxy concentration such that LTGs are less
concentrated higher angular momentum systems, with the fast-rotating
ETGs (FRs) more concentrated and lower in angular momentum. This
suggests that some dynamical processes are involved in transforming
LTGs to FRs, though a significant overlap between the λR
distributions of these classes of galaxies implies that this is just
one piece of a more complicated picture. We measure the kinematic
misalignment angle, Ψ, for the ETGs in the sample, to probe the
intrinsic shapes of the galaxies. We find the majority of FRs (83 per
cent) to be aligned, consistent with them being oblate spheroids (i.e.
discs). The slow rotating ETGs (SRs), on the other hand, are
significantly more likely to show kinematic misalignment (only 38 per
cent are aligned). This confirms previous results that SRs are likely
to be mildly triaxial systems.
Description:
The Sydney-AAO Multi-object IFS (SAMI; Croom et al.
2012MNRAS.421..872C 2012MNRAS.421..872C) is a fibre-fed multi-object IFS on the
Anglo-Australian Telescope (AAT) capable of observing 13 galaxies at
once.
The SAMI Pilot Survey is a precursor to the SAMI Galaxy Survey and is
focused on galaxies in clusters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 87 106 The 106 galaxies in the SAMI Pilot Survey
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Galaxy sequential number
5- 23 A19 --- Galaxy Galaxy name (JHHMMSS.ss+DDMMSS.s)
24 A1 --- n_Galaxy [*] note on eps and PA (1)
26- 34 A9 --- Cluster Cluster sample the galaxy belongs to
(ABELLNNNN)
36 I1 --- Memb [0/1] shows whether the galaxy was deemed to
be a cluster member (1) or not (0)
38- 43 F6.2 mag RMAG Absolute R magnitude from NYU-VAGC
(Blanton et al., 2005AJ....129.2562B 2005AJ....129.2562B)
45- 49 F5.3 --- eps Ellipticity
51- 55 F5.1 deg PAphot Photometric position angle
57- 61 F5.1 deg PAkin Kinematic position angle
63- 66 F4.1 deg Psi Misalignment angle
68- 72 F5.3 --- lambdaR λR parameter, proxy for the specific
stellar angular momentum
74- 78 F5.3 --- e_lambdaR rms uncertainty on lambdaR
80- 82 A3 --- Class Kinematic classification for the ETGs and
morphological classification for the LTGs
84- 87 A4 --- Rad Fiducial radius at which λR was
measured (Re or Re/2)
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Note (1): Ellipticy and PA are measured at one effective radius, except for
those galaxies whose names are marked with a '*', which showed strong
contamination from bars at one effective radius. In these objects, the
ellipticity and PA are calculated in the outskirts of the galaxy, away from
the influence of the bar.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 29-Jun-2016