J/MNRAS/468/2645 Dynamics of A3266. I. An Optical View. (Dehghan+, 2017)
Dynamics of Abell 3266. I. An optical view of a complex merging cluster.
Dehghan S., Johnston-Hollitt M., Colless M., Miller R.
<Mon. Not. R. Astron. Soc. 468, 2645-2654 (2017)>
=2017MNRAS.468.2645D 2017MNRAS.468.2645D (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxy catalogs ; Spectroscopy ;
Radial velocities
Keywords: galaxies: clusters: general - galaxies: clusters: individual: A3266 -
galaxies: distances and redshifts
Abstract:
We present spectroscopy of 880 galaxies within a 2-degree field around
the massive, merging cluster Abell 3266. This sample, which includes
704 new measurements, was combined with the existing redshifts
measurements to generate a sample of over 1300 spectroscopic
redshifts; the largest spectroscopic sample in the vicinity of A3266
to date. We define a cluster sub-sample of 790 redshifts which lie
within a velocity range of 14000 to 22000km/s and within 1 degree
of the cluster centre. A detailed structural analysis finds A3266 to
have a complex dynamical structure containing six groups and filaments
to the north of the cluster as well as a cluster core which can be
decomposed into two components split along a northeast-southwest axis,
consistent with previous X-ray observations. The mean redshift of the
cluster core is found to be 0.0594±0.0005 and the core velocity
dispersion is given as 1462±99km/s. The overall velocity
dispersion and redshift of the entire cluster and related structures
are 1337±67 km/s and 0.0596±0.0002, respectively, though the
high velocity dispersion does not represent virialised motions but
rather is due to relative motions of the cluster components. We posit
A3266 is seen following a merger along the northeast southwest axis,
however, the rich substructure in the rest of the cluster suggests
that the dynamical history is more complex than just a simple merger
with a range of continuous dynamical interactions taking place. It is
thus likely that turbulence in A3266 is very high, even for a merging
cluster.
Description:
Spectroscopic redshifts for 1303 galaxies within a 2-degree field
around Abell 3266. Redshifts are listed for 880 galaxies observed with
the 2dF instrument on the Anglo-Australian Telescope (Dehghan et al.,
2017, this paper), 391 objects from the compilation of Quintana et al.
(1996, Cat. J/AJ/112/36), 264 objects from the WIde-field Nearby
Galaxy-cluster Survey (WINGS; Cava et al., 2009, Cat. J/A+A/495/707),
and an additional 39 objects from various works in the literature
within one degree of the nominal centre of A3266. The 880 galaxies
from the 2dF sample were observed on 29 December 1997 and 5 October
1999. Four fibre configurations were observed, all covering a single
2-degree-diameter field around the nominal cluster centre of
RA=04:31:09.7, DE=-61:28:40 (J2000).
The data were reduced with the 2dfdr pipeline reduction software for
2dF, and redshifts were measured using a modified version of the
program used for the 2dF Galaxy Redshift Survey (Colless et al.,
2001MNRAS.328.1039C 2001MNRAS.328.1039C, Cat. VII/226). The positions of the AAO catalogue
come from the UK Schmidt Telescope southern sky survey plate for field
F118, scanned with the Automated Plate Measuring machine (Maddox et
al., 1990MNRAS.243..692M 1990MNRAS.243..692M). Full details can be found in the paper.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 78 1303 Full data table for heliocentric radial
velocities in a 2-degree region around Abell 3266
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See also:
VII/226 : 2dF Galaxy Redshift Survey 100k Data Release (2dFGRS Team 2001)
J/AJ/112/36 : Velocities in Abell 3266 (Quintana+ 1996)
J/A+A/495/707 : WINGS spectroscopy of 48 galaxy clusters (Cava+, 2009)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 23 F4.1 arcsec DEs Declination (J2000)
25- 29 I5 km/s HRVL ? Heliocentric radial velocity obtained from
the literature
31- 33 I3 km/s e_HRVL ? Uncertainty in the literature measurement
35- 40 I6 km/s HRVW ? Heliocentric radial velocity obtained from
WINGS catalogue
42- 44 I3 km/s e_HRVW ? Uncertainty in WINGS measurement
46- 50 I5 km/s HRVQ ? Heliocentric radial velocity obtained from
Quintana et al. (1996, Cat. J/AJ/112/36)
52- 54 I3 km/s e_HRVQ ? Uncertainty in Quintana et al.
(1996, Cat. J/AJ/112/36) measurement
56- 61 I6 km/s HRV2 ? 2dF heliocentric radial velocity
63- 65 I3 km/s e_HRV2 ? Uncertainty in 2dF measurement
67- 72 I6 km/s HRV Average heliocentric radial velocity
74- 76 I3 km/s e_HRV ? Uncertainty in the average measurement
78 I1 --- Ref [1/9] Reference (1)
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Note (1): References as follows:
1 = this work, a value involving a new (2dF) measurement or an averaged
value of two or more older datasets
2 = Quintana et al. (1996, Cat. J/AJ/112/36)
3 = Cava et al. (2009, Cat. J/A+A/495/707)
4 = Christlein & Zabludoff (2003, Cat. J/ApJ/591/764)
5 = Green et al. (1990MNRAS.243..159G 1990MNRAS.243..159G)
6 = Quintana & Ramirez (1990AJ....100.1424Q 1990AJ....100.1424Q)
7 = Grupe et al. (1998A&A...330...25G 1998A&A...330...25G)
8 = Smith et al. (2004, Cat. J/AJ/128/1558)
9 = Huchra et al. (2012, Cat. J/ApJS/199/26)
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Acknowledgements:
Siamak Dehghan, siamak.dehghan(at)vuw.ac.nz
References:
Cava et al., 2009A&A...495..707C 2009A&A...495..707C
WINGS-SPE Spectroscopy in the WIde-field Nearby Galaxy-cluster Survey
Christlein & Zabludoff, 2003ApJ...591..764C 2003ApJ...591..764C
Galaxy Luminosity Functions from Deep Spectroscopic Samples of Rich Clusters
Colless et al., 2001MNRAS.328.1039C 2001MNRAS.328.1039C
The 2dF Galaxy Redshift Survey: spectra and redshifts
Green et al., 1990MNRAS.243..159G 1990MNRAS.243..159G
Three southern cD clusters of galaxies Klemola 44, Sersic 40/6 and 2354 - 35
Grupe et al., 1998A&A...330...25G 1998A&A...330...25G
New bright soft X-ray selected ROSAT AGN
Huchra et al., 2012ApJS..199...26H 2012ApJS..199...26H
The 2MASS Redshift Survey - Description and Data Release
Maddox et al., 1990MNRAS.243..692M 1990MNRAS.243..692M
The APM galaxy survey. I - APM measurements and star-galaxy separation
Quintana & Ramirez 1990AJ....100.1424Q 1990AJ....100.1424Q
Galaxy velocities and substructures in southern clusters
Quintana et al., 1996AJ....112...36Q 1996AJ....112...36Q
Dynamics of the Cluster of Galaxies A3266
Smith et al. 2004AJ....128.1558S 2004AJ....128.1558S
NOAO Fundamental Plane Survey
(End) Siamak Dehghan [VUW, New Zealand], Patricia Vannier [CDS] 01-Mar-2017