J/MNRAS/437/1858 Galaxies in the RX J1347.5-1145 cluster (Kohlinger+, 2014)
Strong lensing in RX J1347.5-1145 revisited.
Kohlinger F., Schmidt R.W.
<Mon. Not. R. Astron. Soc., 437, 1858-1871 (2014)>
=2014MNRAS.437.1858K 2014MNRAS.437.1858K
ADC_Keywords: Clusters, galaxy ; Morphology
Keywords: gravitational lensing: strong -
galaxies: clusters: individual: RX J1347.5-1145 -
cosmology: observations
Abstract:
We present a revised strong lensing mass reconstruction of the galaxy
cluster RX J1347.5-1145. The X-ray luminous cluster at redshift
z=0.451 has already been studied intensively in the past. Based on
information of two such previous (strong-) lensing studies by Halkola
et al. (2008A&A...481...65H 2008A&A...481...65H) and Bradac et al. (2008ApJ...681..187B 2008ApJ...681..187B),
as well as by incorporating newly available data from the Cluster
Lensing And Supernova survey with Hubble, we identified four systems
of multiply lensed images (anew) in the redshift range 1.75≤z≤4.19.
One multiple image system consists of in total eight multiply lensed
images of the same source. The analysis based on a parametric mass
model derived with the software GLAFIC suggests that the high image
multiplicity is due to the source (zphot=4.19) being located on a
so-called 'swallowtail' caustic. In addition to the parametric mass
model, we also employed a non-parametric approach using the software
pixelens in order to reconstruct the projected mass of the cluster
using the same strong lensing data input. Both reconstructed mass
models agree in revealing several mass components and a highly
elliptic shape of the mass distribution. Furthermore, the projected
mass inside, for example, a radius R∼35arcsec∼200kpc of the cluster
for a source at redshift z=1.75 is
M(<R)~(2.19+0.01-0.02)*1014M☉ as estimated by GLAFIC.
Within the same radius pixelens predicts a mass of
M(<R)~(2.47±0.01)*1014M☉which exceeds the GLAFIC estimate by
∼13 per cent. The difference could be related to the fundamental
degeneracy involved when constraining dark matter substructures with
gravitationally lensed arcs.
Description:
The galaxy cluster RX J1347.5-1145 was re-observed as one out of 25
galaxy cluster targets of the CLASH programme (cf. Postman et al.
2012ApJS..199...25P 2012ApJS..199...25P, Cat. J/ApJS/199/25 for full details on this
survey).
The images were taken in 16 broad-band filters of the Wide Field
Camera 3 (WFC3)/UVIS,1 WFC3/IR2 and ACS/WFC3 of HST comprising a total
spectral range from near-UV to near-IR, yielding highly reliable
photometry.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 86 101 Full list of member galaxies used for the parametric
mass model in GLAFIC (Oguri 2010PASJ...62.1017O 2010PASJ...62.1017O)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 21 F21.17 arcsec oRA [-76/72] Offset in right ascension relative to
206.8775-11.7526 (J2000)
23- 43 F21.17 arcsec oDE [-71/80] Offset in declination relative to
206.8775-11.7526 (J2000)
46- 65 F20.18 --- Li [0.01/3.6] Normalised F814W luminosity (Li/L*) (1)
67- 71 F5.3 --- e [0/1] Ellipticity
74- 84 F11.7 --- theta [-90/90] Galaxy orientation angle θ
86 A1 --- Mmb [s] s for spectroscopically confirmed cluster
members by Lu et al. (2010MNRAS.403.1787L 2010MNRAS.403.1787L)
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Note (1): Luminosities Li were derived from the F814W magnitudes taken from
the provided CLASH ACS-IR catalogue as well as the other parameters needed.
The reference values for L*, σ* and rtrunc,* were chosen such that a
galaxy with magF814WAB=20.5 has a velocity dispersion σ=260km/s and
a truncation radius rtrunc=5kpc which is the same normalization as given
in Bradac et al. (2008ApJ...681..187B 2008ApJ...681..187B)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Nov-2014