J/ApJ/755/31 Compilation of 122 strong gravitational lenses (Cao+, 2012)
Testing the dark energy with gravitational lensing statistics.
Cao S., Covone G., Zhu Z.-H.
<Astrophys. J., 755, 31 (2012)>
=2012ApJ...755...31C 2012ApJ...755...31C
ADC_Keywords: Gravitational lensing ; Redshifts
Keywords: cosmological parameters; gravitational lensing: strong;
methods: statistical
Abstract:
We study the redshift distribution of two samples of early-type
gravitational lenses, extracted from a larger collection of 122
systems, to constrain the cosmological constant in the ΛCDM
model and the parameters of a set of alternative dark energy models
(XCDM, Dvali-Gabadadze-Porrati, and Ricci dark energy models), in a
spatially flat universe. The likelihood is maximized for
ΩΛ=0.70±0.09 when considering the sample excluding
the Sloan Lens ACS systems (known to be biased toward large
image-separation lenses) and no-evolution, and
ΩΛ=0.81±0.05 when limiting to gravitational lenses
with image separation Δθ>2" and no-evolution. In both
cases, results accounting for galaxy evolution are consistent within
1σ. The present test supports the accelerated expansion, by
excluding the null hypothesis (i.e., ΩΛ=0) at more than
4σ, regardless of the chosen sample and assumptions on the
galaxy evolution. A comparison between competitive world models is
performed by means of the Bayesian information criterion. This shows
that the simplest cosmological constant model--that has only one free
parameter--is still preferred by the available data on the redshift
distribution of gravitational lenses. We perform an analysis of the
possible systematic effects, finding that the systematic errors due to
sample incompleteness, galaxy evolution, and model uncertainties
approximately equal the statistical errors, with present-day data. We
find that the largest sources of systemic errors are the dynamical
normalization and the high-velocity cutoff factor, followed by the
faint-end slope of the velocity dispersion function.
Description:
We have compiled a list of 122 gravitational lenses from a variety of
sources in literature. Their basic data (lens and source redshifts
both and the largest image separations) are summarized in Table 1. In
order to build an homogeneous galaxy sample, we limit our analysis to
galaxies with early-type morphology.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 46 122 Summary of the properties of the strongly lensed
systems
refs.dat 94 60 References
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See also:
J/AJ/143/119 : SDSS Quasar Lens Search. V. Final catalog (Inada+, 2012)
J/ApJ/749/38 : CFHTLS-SL2S-ARCS strong lens candidates (More+, 2012)
J/ApJS/176/19 : COSMOS: strong lens systems (Faure+, 2008)
J/ApJ/682/964 : Sloan lens ACS survey. V. (Bolton+, 2008)
J/ApJ/668/643 : Multiply imaged gravitational lens systems (Limousin+, 2007)
J/ApJ/600/L155 : Gravitational lens in GOODS ACS fields (Fassnacht+, 2004)
J/A+A/391/481 : R-band photometry of SBS1520+530 (Burud+, 2002)
http://www.cfa.harvard.edu/castles/ : CASTLES survey home page
http://cosmos.astro.caltech.edu/ : Cosmological Evolution Survey (COSMOS) page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Lens name (1)
18- 23 F6.4 --- zs [0.1/4.5] Redshift of the source
25- 31 F7.5 --- zlens [0.03/1.2] Redshift of the lens
33- 37 F5.3 arcsec Delt [0.3/3.8] Largest image separation
(Δθ)
39- 46 A8 --- Ref Reference(s) (see refs.dat file)
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Note (1): The main reference is given by the SLACS project (Bolton et al. 2008,
Cat. J/ApJ/682/964), providing 59 lenses in our list;
in the format JHHMM+DDMM ( in Simbad).
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Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode Bibcode
24- 43 A20 --- Aut Author's name(s)
45- 94 A50 --- Comm Comment
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 06-Mar-2014