J/ApJ/888/35 Redshifts of lensed systems toward RXCJ2248.7-4431 (Chan+, 2020)
Redshift determinations from a self-consistent grid-based lens model for the
Hubble Frontiers Field cluster RXC J2248.7-4431 (AS1063).
Chan B.M.Y., Broadhurst T., Lim J., Wong J., Diego J.M., Coe D.
<Astrophys. J., 888, 35 (2020)>
=2020ApJ...888...35C 2020ApJ...888...35C
ADC_Keywords: Clusters, galaxy; Gravitational lensing; Redshifts; Models
Keywords: gravitational lensing: strong; dark matter; galaxies: high-redshift;
galaxies: clusters: general
Abstract:
We present an iterative method to construct a freeform lens model that
self-consistently reproduces the sky positions, geometrically inferred
redshifts, and relative brightnesses of all multiply lensed images
toward a galaxy cluster. This method is applied to the cluster
RXCJ2248.7-4431 (z=0.348) from the Hubble Frontier Fields program,
toward which 10 multiply lensed sources with accurate spectroscopic
redshifts and 6 others with inexact photometric redshifts have been
identified. Using the spectroscopically secure systems to define an
initial lens model, we compute the geometric redshifts of the
photometric systems. We then iterate the lens model by incorporating
the photometric systems at redshifts shifted by incremental amounts
toward their geometric redshifts inferred from the previous step; on
convergence, we find geometric redshifts in good agreement with the
spectroscopically determined redshifts, but they can depart
significantly from the photometrically determined redshifts. In the
final lens model, all 16 lensed sources tightly follow the
cosmological form of the angular diameter distance relation.
Furthermore, although they are not used as model constraints, our lens
model predicts relative brightnesses between image pairs for a given
set of multiply lensed images in reasonable agreement with
observations, thus providing independent validation of this model.
Description:
Drizzled science images of RXC J2248.7-4431 are available in both
the CLASH and HFF archive.
Observations of RXC J2248.7-4431 for the HFF program were completed in
2016 May, providing images in seven wavelength bands between 0.4 and
1.6um that reach a limiting magnitude of 30 AB magnitude from a
total of 155 orbits. Spectroscopic data were obtained for 27 lensed
images from 12 lensed systems by the Multi Unit Spectroscopic Explorer
(MUSE) survey Bacon+ (2010SPIE.7735E..08B 2010SPIE.7735E..08B). See Section 3.
Objects:
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RA (ICRS) DE Designation(s)
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22 48 54.3 -44 31 07 RXC J2248.7-4431 = ACO S 1063
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 90 121 Detailed information for individual lensed images
in the cluster RXC J2248.7-4431
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See also:
J/ApJ/621/53 : Multiple arc systems in A1689 (Broadhurst+, 2005)
J/ApJ/668/643 : Multiply imaged gravitational lens systems (Limousin+, 2007)
J/ApJS/176/19 : COSMOS: strong lens systems (Faure+, 2008)
J/ApJS/199/25 : CLASH sources for MACS1149.6+2223 (Postman+, 2012)
J/A+A/546/A6 : Metal abundances of galaxy clusters (Andreon, 2012)
J/ApJ/762/L30 : MCS J0416.1-2403 strong lensing analysis (Zitrin+, 2013)
J/ApJ/792/76 : Lensed z∼6-8 galaxies behind CLASH clusters (Bradley+, 2014)
J/MNRAS/444/268 : HST Frontier Fields clusters (Richard+, 2014)
J/MNRAS/446/683 : Free-form lensing grid solution for A1689 (Diego+, 2015)
J/ApJ/801/44 : HST lensing analysis of the CLASH sample (Zitrin+, 2015)
J/ApJ/819/114 : Lensing mass modeling of 4 HFF clusters (Kawamata+, 2016)
J/ApJ/843/41 : HST/WFC3 obs. of z∼2-8 gal. in HFF clusters (Bouwens+, 2017)
J/ApJ/848/37 : HST UV-IR photometry in CLASH galaxy clusters (Connor+, 2017)
J/ApJ/854/73 : Full-data results of HFF: galaxies z∼6-9 (Ishigaki+, 2018)
J/ApJ/862/156 : High-z galaxy cand. in the HFF cluster fields (Leung+, 2018)
J/A+A/613/A72 : AS1063 and MACS1206-08 datacubes (Girard+, 2018)
J/A+A/633/A139 : Abundances of RXC J2248.7-4431 galaxies (Ciocan+, 2020)
J/A+A/636/A15 : X-ray galaxy cluster sample (Migkas+, 2020)
J/A+A/643/A177 : Candidate Cluster Members with Deep learning (Angora+, 2020)
J/A+A/646/A71 : CFHTLenS galaxy bias and redshift distribution (Simon+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- ID Image identifier (1)
6 A1 --- f_ID Flag on ID (2)
8- 9 I2 h RAh Hour of right ascension (J2000)
11- 12 I2 min RAm Minute of right ascension (J2000)
14- 19 F6.3 s RAs Second of right ascension (J2000)
21 A1 --- DE- Sign of declination (J2000)
22- 23 I2 deg DEd Degree of declination (J2000)
25- 26 I2 arcmin DEm Arcminute of declination (J2000)
28- 32 F5.2 arcsec DEs Arcsecond of declination (J2000)
34- 38 F5.3 --- zspec [0.7/6.2]? Spectroscopic redshift
of the lensed system
40- 43 F4.2 --- zphot [0.9/3.8]? Photometric redshift
for individual image
45- 48 F4.2 --- b_zphot [0.04/3.5]? Zphot lower limit
50- 53 F4.2 --- B_zphot [0.9/4.1]? Zphot upper limit
55- 58 F4.2 --- Geoz [0.8/7] Predicted geometric redshift
for individual system
60- 65 F6.2 --- mu [2/873] magnification (µ value)
67 I1 --- CL [1/3] Confidence level (3=the highest) (3)
69- 90 A22 --- Note Note
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Note (1): The ID of the counter images, following the original notation of
Richard+ (2014, J/MNRAS/444/268), Johnson+ (2014ApJ...797...48J 2014ApJ...797...48J),
Diego+ (2018MNRAS.473.4279D 2018MNRAS.473.4279D).
Note (2): Flag as follows:
b = Images used to constrain the Preliminary Spectroscopic Mass Model
(Model A; see Section 7.1.1).
* = Less reliable spectroscopic systems, which are not used in
constraining the mass model.
Note (3): Confidence level as follows:
3 = spectroscopically confirmed images
2 = images with photometric redshifts only
1 = images with model-predicted redshifts only
See Section 7.1.1.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 14-Jun-2021