J/ApJ/839/L11 HST strong lensing analysis of PLCKG287.0+32.9 (Zitrin+, 2017)
A very large (θE ≥40") strong gravitational lens selected with
the Sunyaev-Zel'dovich effect: PLCK G287.0+32.9 (z=0.38).
Zitrin A., Seitz S., Monna A., Koekemoer A.M., Nonino M., Gruen D.,
Balestra I., Girardi M., Koppenhoefer J., Mercurio A.
<Astrophys. J., 839, L11 (2017)>
=2017ApJ...839L..11Z 2017ApJ...839L..11Z
ADC_Keywords: Clusters, galaxy; Gravitational lensing; Redshifts;
Photometry, HST; Spectroscopy
Keywords: galaxies: clusters: general ;
galaxies: clusters: individual (PLCK G287.0+32.9) ;
gravitational lensing: strong
Abstract:
Since galaxy clusters sit at the high end of the mass function, the
number of galaxy clusters both massive and concentrated enough to
yield particularly large Einstein radii poses useful constraints on
cosmological and structure formation models. To date, less than a
handful of clusters are known to have Einstein radii exceeding ∼40"
(for a source at zs∼2, nominally). Here, we report an addition to
that list of the Sunyaev-Zel'dovich (SZ) selected cluster,
PLCKG287.0+32.9 (z=0.38), the second-highest SZ-mass (M500) cluster
from the Planck catalog. We present the first strong-lensing analysis
of the cluster, identifying 20 sets of multiply imaged galaxies and
candidates in new Hubble Space Telescope (HST) data, including a long,
l∼22" giant arc, as well as a quadruply imaged, apparently bright
(magnified to JF110W=25.3 AB), likely high-redshift dropout galaxy
at zphot=6.90 [6.13-8.43] (95% C.I.). Our analysis reveals a very
large critical area (1.55arcmin2, zs∼2), corresponding to an
effective Einstein radius of θE∼42". The model suggests the
critical area will expand to 2.58arcmin2 (θE∼54") for
sources at zs∼10. Our work adds to recent efforts to model very
massive clusters toward the launch of the James Webb Space Telescope,
in order to identify the most useful cosmic lenses for studying the
early universe. Spectroscopic redshifts for the multiply imaged
galaxies and additional HST data will be necessary for refining the
lens model and verifying the nature of the z∼7 dropout.
Description:
We obtained Hubble Space Telescope (HST) data in Cycle 23 to perform a
dedicated strong-lensing (SL) analysis of the PLCKG287.0+32.9 cluster
(PI: Seitz, program ID 14165). PLCKG287 was observed on 2016 August 3
in the optical, ACS bands F475W, F606W, and F814W, with total exposure
times of 1, 1, and 2 orbits, respectively. The cluster was also
observed on 2016 May 18 with the WFC3/IR F110W filter, with four
exposures per orbit over four orbits, centered on two locations, and
adopting a half-pixel dither pattern.
We had also observed PLCKG287 with VIMOS on the VLT/UT3 in service
mode on four nights in 2015 February-March. We used the
medium-resolution red grism and the GG475 filter, covering the
∼5000-10000Å spectral range, with a resolution of ∼600. A total of
twenty 1135s exposures were obtained.
Out of the 248 red-sequence galaxies we consider members for the
modeling, 35 within the HST FOV are spectroscopically confirmed.
We use the light-traces-mass (LTM) method by Zitrin+ (2009MNRAS.396.1985Z 2009MNRAS.396.1985Z)
for the SL analysis of PLCKG287. See Section 3.
Objects:
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RA (ICRS) DE Designation(s)
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11 50 49.20 -28 04 36.5 PLCK G287.0+32.9 = PLCKESZ G287.0+32.9
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 114 60 Multiple images and candidates
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/ApJ/621/53 : Multiple arc systems in A1689 (Broadhurst+, 2005)
J/A+A/536/A8 : Planck early results. VIII. ESZ sample. (Planck+, 2011)
J/ApJS/199/25 : CLASH sources for MACS1149.6+2223 (Postman+, 2012)
J/ApJ/792/76 : Lensed z∼6-8 galaxies behind CLASH clusters (Bradley+, 2014)
J/A+A/581/A14 : Updated Planck catalogue PSZ1 (Planck+, 2015)
J/ApJ/801/44 : HST lensing analysis of the CLASH sample (Zitrin+, 2015)
J/ApJ/819/114 : Strong lensing mass modeling of 4 HFF cl. (Kawamata+, 2016)
J/ApJ/882/69 : Radio relic merging galaxy cl. substructures (Golovich+, 2019)
J/ApJS/240/39 : Merging galaxy cluster deep observations (Golovich+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- ID Arc identifier (1)
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- 33 F6.3 arcsec DEs Arcsecond of declination (J2000)
35- 38 F4.2 --- zphot [0.09/6.94]? Photometric redshift
40- 43 F4.2 --- b_zphot [0/6.2]? Lower 95% C.L. from BPZ on zphot
45- 48 F4.2 --- B_zphot [0.6/9]? Upper 95% C.L. from BPZ on zphot
50- 53 F4.2 --- zml [0.89/6.9]? Predicted redshift by our lens model
55- 58 F4.2 --- b_zml [0.7/2.2]? Lower 95% C.L. on zml
60- 63 F4.2 --- B_zml [0.9/3]? Upper 95% C.L. on zml
65- 114 A50 --- Comm Comments
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Note (1): "c" stands for candidate where identification was more ambiguous, and
image was not used as a constraint.
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Nomenclature note: lensed images and candidates are
<[ZSM2017] PLCK G287.0+32.9 NN.N> and
<[ZSM2017] PLCK G287.0+32.9 cNN.N> in Simbad.
History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 02-Jun-2021