J/ApJ/863/102 Spectroscopic redshift catalog in A2142 field (Liu+, 2018)
Inside a beehive: the multiple merging processes in the galaxy cluster
Abell 2142.
Liu A., Yu H., Diaferio A., Tozzi P., Hwang Ho S., Umetsu K., Okabe N.,
Yang L.-L.
<Astrophys. J., 863, 102 (2018)>
=2018ApJ...863..102L 2018ApJ...863..102L
ADC_Keywords: Clusters, galaxy; Galaxies, spectra; Redshifts; Photometry, SDSS
Keywords: galaxies: clusters: general ;
galaxies: clusters: individual (Abell 2142) ;
galaxies: clusters: intracluster medium
Abstract:
To investigate the dynamics of the galaxy cluster A2142, we compile an
extended catalog of 2239 spectroscopic redshifts of sources, including
237 newly measured redshifts, within 30 arcmin from the cluster
center. With the σ-plateau algorithm from the caustic method, we
identify 868 members and a number of substructures in the galaxy
distribution both in the outskirts, out to ∼3.5Mpc from the cluster
center, and in the central region. In the outskirts, one substructure
overlaps a falling clump of gas previously identified in the X-ray
band. These substructures suggest the presence of multiple minor
mergers, which are responsible for the complex dynamics of A2142, and
the absence of recent or ongoing major mergers. We show that the
distribution of the galaxies in the cluster core and in several
substructures is consistent with the mass distribution inferred from
the weak-lensing signal. Moreover, we use spatially resolved X-ray
spectroscopy to measure the redshift of different regions of the
intracluster medium within ∼3 arcmin from the cluster center. We find
a ring of gas near the two X-ray cold fronts identified in previous
analyses and measure a velocity of this ring of 810±330km/s larger
than the cluster mean velocity. Our analysis suggests the presence of
another ring surrounding the core, whose velocity is 660±300km/s
larger than the cluster velocity. These X-ray features are not
associated with any optical substructures, and support the
core-sloshing scenario suggested in previous work.
Description:
We compile the currently largest catalog of 2239 spectroscopic
redshifts in the field of view of Abell 2142. Our catalog covers an
area of 1°x1° around the cluster center, corresponding to an
area 7x7Mpc2 at the cluster redshift z=0.09. Our catalog includes
1270 redshifts from the catalog of Owers+ (2011, J/ApJ/741/122) that
are not in the SDSS DR13 (Albareti+ 2017ApJS..233...25A 2017ApJS..233...25A). We include
731 additional redshifts from SDSS catalog and one redshift from
Oegerle+ (1995AJ....110...32O 1995AJ....110...32O).
In 2014 June, to secure more redshifts, we made additional
spectroscopic observations with the 300 fiber Hectospec multi-object
spectrograph on the MMT 6.5m telescope (3650-9150Å coverage;
resolution of ∼6Å). In total, we obtained 237 additional redshifts
in the field.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 78 2239 Redshift catalog in the fields of Abell 2142
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See also:
J/ApJ/741/122 : Redshifts in A2142 and RXJ1720.1+2638 (Owers+, 2011)
J/MNRAS/436/275 : Relaxation param. of 2092 rich galaxy clusters (Wen+, 2013)
J/ApJS/213/35 : SHELS: galaxy redshift survey for R≤20.6 (Geller+, 2014)
J/ApJ/797/106 : Redshifts in nine galaxy cluster fields (Hwang+, 2014)
J/A+A/579/A4 : MCS J1206.2-0847 gal. spectral classif. (Girardi+, 2015)
J/ApJS/224/11 : SHELS: redshift survey of the F1 DLS field (Geller+, 2016)
J/A+A/600/A90 : MACS J0416.1-2403 redshift catalogue (Caminha+, 2017)
J/A+A/607/A131 : Abell 520 galaxies redshifts (Deshev+, 2017)
J/MNRAS/465/2616 : Galaxy cluster's rotation (Manolopoulou+, 2017)
J/ApJ/842/88 : A redshift survey of A2199 central region (Song+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1/2239] Internal object identifier
6- 15 F10.6 deg RAdeg [238.98/240.21] Right Ascension (J2000)
17- 25 F9.6 deg DEdeg [26.6/27.8] Declination (J2000)
27- 45 I19 --- ObjID SDSS DR13/DR7 identifier (1)
47- 52 F6.3 mag rmag [9.2/22.7] SDSS r-band Petrosian magnitude
corrected for Galactic extinction
54- 61 F8.5 --- z [-0.002/6.2] Spectroscopic redshift
63- 69 F7.5 --- e_z [1e-05/1.2] Uncertainty in z
71- 76 A6 --- r_z Reference for z (2)
78- 78 A1 --- Mm Membership given by the caustic method
("Y": 868 occurrences)
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Note (1): IDs starting with 12 are from the DR13 while those starting with
58 are from the DR7.
Note (2): Reference as follows:
MMT = this study (237 occurrences);
Owers = Owers et al. (2011, J/ApJ/741/122);
SDSS = SDSS DR13;
Oegerle = Oegerle et al. (1995AJ....110...32O 1995AJ....110...32O).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 07-Aug-2019