J/A+A/657/A83 Galaxy cluster strong lensing cosmography (Caminha+, 2022)
Galaxy cluster strong lensing cosmography. Cosmological constraints from a
sample of regular galaxy clusters.
Caminha G.B., Suyu S.H., Grillo C., Rosati P.
<Astron. Astrophys. 657, A83 (2022)>
=2022A&A...657A..83C 2022A&A...657A..83C (SIMBAD/NED BibCode)
ADC_Keywords: Models ; Clusters, galaxy
Keywords: cosmology: observations - cosmological parameters - dark energy -
gravitational lensing: strong - galaxies: clusters: general
Abstract:
Cluster strong lensing cosmography is a promising probe of the
background geometry of the Universe and several studies have emerged
thanks to the increased quality of observations using space- and
ground-based telescopes. For the first time, we used a sample of five
cluster strong lenses to measure the values of cosmological parameters
and combine them with those from classical probes. In order to assess
the degeneracies and the effectiveness of strong-lensing cosmography
in constraining the background geometry of the Universe, we adopted
four cosmological scenarios. We found good constraining power on the
total matter density of the Universe ({OMEGA}m) and the equation of
state of the dark energy parameter w. For a flat wCDM cosmology, we
found {OMEGA}m=0.30+0.090.11 and w=-1.12+0.170.32 from
strong lensing only. Interestingly, we show that the constraints from
the cosmic microwave background (CMB) are improved by factors of 2.5
and 4.0 on {OMEGA}m and w, respectively, when combined with our
posterior distributions in this cosmological model. In a scenario
where the equation of state of dark energy evolves with redshift, the
strong lensing constraints are compatible with a cosmological constant
(i.e. {OMEGA}m=-1). In a curved cosmology, our strong lensing
analyses can accommodate a large range of values for the curvature of
the Universe of {OMEGA}k=0.28+0.160.21. In all cosmological
scenarios, we show that our strong lensing constraints are
complementary and in good agreement with measurements from the CMB,
baryon acoustic oscillations, and Type Ia supernovae. Our results show
that cluster strong lensing cosmography is a potentially powerful
probe to be included in the cosmological analyses of future surveys.
Description:
The file names contain the cluster name, cosmology ID and cosmological
parameters following the convention used in the paper (see tables 1
and 2 of the manuscript). The MCMC chains containing the cosmological
parameters only are in the file cosmo_chains subdirectory.
In addition of the MCMC chains containing only the cosmological
parameters, we also make publicly available the full chains,
containing also the cluster mass parameters in the standard lenstool
'bayes.dat' format. These files are in the massandcosmo_chains
subdirectory and follow the same naming convention, but include
_ALL.txt at the end. Labels are in the header files.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 65 40 List of files
cosmo_chains/* . 20 MCMC chains with cosmological parameters
massandcosmo_chains/* . 20 MCMC full chains
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See also:
J/A+A/632/A36 : Strong lensing models of 8 CLASH clusters (Caminha+, 2019)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Cluster Cluster name
7- 17 A11 --- Model Model used
19- 65 A47 --- FileName Name of the file
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Description of file:
Byte-by-byte Description of file(#): cosmochains/*flat-LCDM.txt
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 E11.6 --- omega_m {OMEGA}m
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Byte-by-byte Description of file (#): cosmochains/*flat-wCDM.txt
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 E11.6 --- omegam {OMEGA}m
13- 24 E12.6 --- w0 w0
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Byte-by-byte Description of file(#): cosmochains/*curved-LCDM.txt
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 E11.6 --- omegam {OMEGA}m
13- 24 E12.6 --- omegak {OMEGA}k
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Byte-by-byte Description of file(#): cosmochains/*CPL.txt
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 E11.6 --- omegam {OMEGA}m
13- 24 E12.6 --- w0 w0
26- 37 E12.6 --- wa wa
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Acknowledgements:
Gabriel Caminha, gbcaminha(at)gmail.com
(End) Patricia Vannier [CDS] 08-Nov-2021