J/A+A/692/A175 MACS J0329-0211 Spectroscopic redshift catalog (Girardi+, 2024)
CLASH-VLT: Galaxy cluster MACS J0329-0211 and its surroundings using galaxies
as kinematic tracers.
Girardi M., Boschin W., Mercurio A., Nocerino N., Nonino M., Rosati P.,
Biviano A., Demarco R., Grillo C., Sartoris B., Tozzi P., Vanzella E.
<Astron. Astrophys. 692, A175 (2024)>
=2024A&A...692A.175G 2024A&A...692A.175G (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Redshifts ; Spectroscopy ; Optical
Keywords: galaxies: clusters: general -
galaxies: clusters: individual: MACS J0329-0211 -
galaxies: kinematics and dynamics
Abstract:
The study of substructure is an important step in determining how
galaxy clusters form. We aim to gain new insights into the
controversial dynamical status of MACS J0329-0211 (MACS0329), a
massive cluster at z=0.4503, with a new analysis using a large sample
of member galaxies as kinematic tracers. Our analysis is based on
extensive spectroscopic data for more than 1700 galaxies obtained with
the VIMOS and MUSE spectrographs at the Very Large Telescope (VLT), in
combination with B and Rc Suprime-Cam photometry from the Subaru
archive. According to our member selection procedure, we define a
sample of 430 MACS0329 galaxies within 6 Mpc, corresponding to about 3
times the virial radius. We estimate the global velocity dispersion,
sigmaV=841km/s, and present the velocity dispersion profile. We
estimate a mass M200=9.2E+14 in units of solar masses, using 227
galaxies within R200=1.71Mpc, for which sigmaV200=1018km/s. The
spatial distribution of the red galaxies traces a SE-NW elongated
structure, without signs of a velocity gradient. This structure likely
originates from the main phase of cluster assembly. The distribution
of the blue galaxies is less concentrated, more rounded and shows
signs of substructure, all characteristics indicating a recent infall
of groups from the field. We detect two loose clumps of blue galaxies
in the south and southwest at a distance about R200 from the cluster
center. The strong spatial segregation among galaxy populations is not
accompanied by kinematical difference. Thanks to our extensive catalog
of spectroscopic redshift, we are able to study galaxy systems that
are intervening along the line of sight. We can identify two
foreground galaxy systems (GrG1 at z=0.31 and GrG2 at z=0.38) and one
background system (GrG3 at z=0.47). We point out that the second
brightest galaxy projected onto the MACS0329 core is in fact the
dominant galaxy of the foreground group GrG2. MACS0329, GrG3 and two
other systems detected using DESI DR9 photometric redshifts are close
to each other, suggesting the presence of a large-scale structure.
MACS0329 is close to a state of dynamical equilibrium, although
surrounded by a very rich environment. We emphasize that the use of an
extensive redshift survey is essential to avoid misinterpretation of
structures projected along the line of sight.
Description:
The table contains redshifts of 1712 galaxies analyzed in the paper.
The objects are part of the spectroscopic dataset collected within the
ESO Large Programme 186.A-0798 "Dark Matter Mass Distributions of
Hubble Treasury Clusters and the Foundations of LambdaCDM Structure
Formation Models" (P.I.: P. Rosati). This program aims at obtaining
spectra for at least 500 cluster members for each of the 14 southern
CLASH clusters with 0.2<z<0.6 (CLASH-VLT survey), using the VIsible
Multi-Object Spectrograph (VIMOS) at the Very Large Telescope
(VLT-ESO). The VIMOS-VLT data are augmented with MUSE-VLT redshifts
and one redshift obtained at the Italian Telescope Galileo (TNG).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 54 1712 Redshifts of 1712 galaxies
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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 [1/1712] Running ID for galaxies (1)
9- 17 F9.6 deg RAdeg Right ascension (J2000.0)
22- 30 F9.6 deg DEdeg Declination (J2000.0)
34- 39 F6.4 --- zspec Spectroscopic redshift
42- 46 F5.2 mag Rcmag ? Suprime-cam Kron Rc-band AB magnitude (2)
49 I1 --- Member [0/1] Cluster membership (3)
52- 54 A3 --- n_zspec Origin of zspec (4)
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Note (1): ID. 508 is the brightest cluster galaxy (BCG) of MACS J0329-0211
and ID. 1712 is the brightest group galaxy of GrG2.
Note (2): Magnitudes are corrected for Galactic extinction.
Note (3): Cluster membership code as follows:
0 = no cluster member
1 = cluster member
Note (4): Origin of zspec as follows:
VLR = VIMOS-VLT with LRb grism
VMR = VIMOS-VLT with MR grism
VMU = MUSE-VLT
TNG = TNG
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Acknowledgements:
Marisa Girardi, marisa.girardi(at)inaf.it
(End) Patricia Vannier [CDS] 30-Oct-2024