J/A+A/670/A60 Abell 2744 members (Bergamini+, 2023)
New high-precision strong lensing modeling of Abell 2744.
Preparing for JWST observations.
Bergamini P., Acebron A., Grillo C., Rosati P., Caminha G.B., Mercurio A.,
Vanzella E., Angora G., Brammer G., Meneghetti M., Nonino M.
<Astron. Astrophys., 670, A60 (2023)>
=2023A&A...670A..60B 2023A&A...670A..60B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Redshifts
Keywords: galaxies: clusters: individual: Abell 2744
Abstract:
We present a new strong lensing (SL) model of the Hubble Frontier
Fields (HFF) galaxy cluster Abell 2744, at z=0.3072, by exploiting
archival Hubble Space Telescope (HST) multiband imaging and Multi Unit
Spectroscopic Explorer (MUSE) follow-up spectroscopy. The lens model
considers 90 spectroscopically confirmed multiple images (from 30
background sources), representing the largest secure sample for this
cluster field prior to the recently acquired James Webb Space
Telescope (JWST) observations. The inclusion of the substructures
within several extended sources as model constraints allowed us to
accurately characterize the inner total mass distribution of the
cluster and the position of the cluster critical lines. We included
the lensing contribution of 225 cluster members, 202 of which are
spectroscopically confirmed. We complemented this sample with 23
photometric member galaxies that are identified with a convolution
neural network methodology with a high degree of purity. We also
measured the internal velocity dispersion of 85 cluster galaxies, down
to mF160W=22, to independently estimate the role of the subhalo mass
component in the lens model. We investigated the effect of the cluster
environment on the total mass reconstruction of the cluster core with
two different mass parameterizations. We considered the mass
contribution from three external clumps, either based on previous weak
lensing studies, or extended HST imaging of luminous members around
the cluster core. In the latter case, the observed positions of the
multiple images were better reproduced, with a remarkable accuracy of
0.37", a factor of ∼2 smaller than previous lens models, which
exploited the same HST and MUSE data sets. As part of this work, we
developed and made publicly available a Strong Lensing Online Tool
(SLOT) to exploit the predictive power and the full statistical
information of this and future models, through a simple graphical
interface. We plan to apply our new high-precision SL model to the
first analysis of the Grism Lens-Amplified Survey from
Space-JWST-Early Release Science (GLASS-JWST-ERS) program,
specifically to measure the intrinsic physical properties of high-z
galaxies from robust magnification maps.
Description:
We have presented a new high-precision SL model for the galaxy cluster
A2744. This component counts a total of 225 galaxies (including the
two BCGs), 202 of which are spectroscopically confirmed cluster
members.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 36 90 Catalog of the spectroscopic multiple images
included in the SL modeling of A2744
tableb1.dat 45 225 Catalog of the spectroscopic and photometric
cluster members included in the SL modeling
of A2744
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See also:
J/A+A/646/A83 : 12 massive lensing clusters MUSE observations (Richard+, 2021)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- ID Identifier (NN.Na)
6 A1 --- n_ID [*+] Note on ID (1)
8- 15 F8.6 deg RAdeg Right ascension (J2000)
17- 26 F10.6 deg DEdeg Declination (J2000)
28- 32 F5.3 --- zsp Spectrocsopic redshift
34 I1 --- QF [1/9] Quality flag (2)
36 I1 --- QP [1/3] Positional quality flag (2)
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Note (1): Notes as follows:
+ = New families with respect to Richard et al.,
2021A&A...646A..83R 2021A&A...646A..83R, cat. J/A+A/646/A83
* = New position with respect to that adopted in Richard et al.,
2021A&A...646A..83R 2021A&A...646A..83R, cat. J/A+A/646/A83
Note (2): Quality flag as follows:
1 = insecure
2 = likely
3 = secure
9 = based on a single emission line
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Byte-by-byte Description of file: tableb1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Type [sp] s for spectroscopic, p for photometric
cluster member
3- 10 I8 --- ID Identification number
12- 19 F8.6 deg RAdeg Right ascension (J2000)
21- 30 F10.6 deg DEdeg Declination (J2000)
32- 36 F5.2 mag mF160W F160W magnitude
38- 44 F7.5 --- zsp ?=- Spectroscopic redshift
45 A1 --- r_zsp [abcde] Redshift reference (1)
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Note (1): References as follows:
a = MUSE measurement from this work
b = Owers et al. (2011ApJ...728...27O 2011ApJ...728...27O, Cat. J/ApJ/728/27)
c = Treu et al. (2015ApJ...812..114T 2015ApJ...812..114T, Cat. J/ApJ/812/114),
Schmidt et al. (2014ApJ...782L..36S 2014ApJ...782L..36S)
d = Braglia et al. (2009A&A...500..947B 2009A&A...500..947B, Cat. J/A+A/500/947 )
e = Couch & Sharples (1987MNRAS.229..423C 1987MNRAS.229..423C)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 15-Jun-2023