J/A+A/635/A98 Redshift catalogs of the Abell 2163 core (Rescigno+, 2020)
An accurate strong lensing model of the Abell 2163 core.
Rescigno U., Grillo C., Lombardi M., Rosati P., Caminha G.B., Meneghetti M.,
Mercurio A., Bergamini P., Coe D.
<Astron. Astrophys. 635, A98 (2020)>
=2020A&A...635A..98R 2020A&A...635A..98R (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Redshifts
Keywords: galaxies: clusters: general -
galaxies: clusters: individual: Abell 2163 -
gravitational lensing: strong - dark matter -
galaxies: distances and redshifts - galaxies: interactions
Abstract:
Abell 2163 at z~=0.201 is one of the most massive galaxy clusters
known, very likely in a post-merging phase. Data from several
observational windows suggest a complex mass structure with
interacting subsystems, which makes the reconstruction of a realistic
merging scenario very difficult. A missing key element in this sense
is unveiling the cluster mass distribution at high resolution. We
perform such a reconstruction of the cluster inner total mass through
a strong lensing model based on new spectroscopic redshift
measurements. We use data from the Multi Unit Spectroscopic Explorer
on the Very Large Telescope to confirm 12 multiple images of four
sources with redshift values from 1.16 to 2.72. We also discover four
new multiple images and identify 29 cluster members and 35 foreground
and background sources. The resulting galaxy member and image catalogs
are used to build five cluster total mass models. The fiducial model
consists of 111 small-scale subhalos, plus a diffuse component, which
is centered ∼2" away from the BCG belonging to the east Abell 2163
subcluster.
We confirm that the latter is well represented by a single,
large-scale mass component. Its strong elongation towards a second
(west) subcluster confirms the existence of a preferential axis,
corresponding to the merging direction. From the fiducial model, we
extrapolate the cumulative projected total mass profile and measure a
value of M(<300kpc)=1.43-0.06+0.07x1014M☉, which has a
significantly reduced statistical error compared with previous
estimates, thanks to the inclusion of the spectroscopic redshifts. Our
strong lensing results are very accurate: the model-predicted
positions of the multiple images are, on average, only 0.15" away from
the observed ones.
Description:
We used archival MUSE (Bacon et al., 2012, The Messenger, 147, 4)
data, from observations covering the North-East region of the core of
the galaxy cluster Abell 2163, with a total exposure of four hours
obtained in one single pointing. The observations were part of one of
the instrument commissioning programs (ID 60.A-9100(C), P.I.s MUSE
TEAM).
Objects:
------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------
16 15 34.1 -06 07 26 Abell 2163 = ACO 2163
------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 32 29 Redshift catalog of galaxy cluster members
table2.dat 33 16 Redshift catalog of multiple images
tablea1.dat 32 39 Redshift catalog of foreground/background sources
--------------------------------------------------------------------------------
See also:
J/A+A/619/A68 : A2163 VLA 20cm images (Thoelken+, 2018)
Byte-by-byte Description of file: table1.dat tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- ID Designation (1)
6- 14 F9.5 deg RAdeg Right ascension (J2000)
16- 23 F8.5 deg DEdeg Declination (J2000)
25- 30 F6.4 --- z MUSE redshift
32 I1 --- QF Quality Flag (G1)
--------------------------------------------------------------------------------
Note (1): designation in the HST ACS+WFC3/IR photometric catalog described in
Cerny et al., 2018ApJ...859..159C 2018ApJ...859..159C, RELICS HST catalogs are available on MAST,
https://archive.stsci.edu/prepds/relics/ .
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- ID Designation
4- 12 F9.5 deg RAdeg Right ascension (J2000)
14- 21 F8.5 deg DEdeg Declination (J2000)
23- 27 F5.3 --- z ?=- MUSE redshift
29 I1 --- QF Quality Flag (G1)
31- 33 F3.1 --- C18 ?=- Designation in Cerny et al.,
2018ApJ...859..159C 2018ApJ...859..159C, table 13, will be
[CSA2018] Abell 2163 N.N in Simbad
--------------------------------------------------------------------------------
Global notes:
Note (G1): Quality flag as follows:
1 = insecure
2 = likely
3 = secure
--------------------------------------------------------------------------------
Acknowledgements:
From Umberto Rescigno, umberto.rescigno(at)unimi.it
when using these redshifts, please acknowledge the paper
Rescigno+, 2020 (A&A, 635, A98)
(End) Patricia Vannier [CDS] 24-Feb-2020