J/MNRAS/478/5104 Model selection with strong-lensing systems (Leaf+, 2018)
Model selection with strong-lensing systems.
Leaf K., Melia F.
<Mon. Not. R. Astron. Soc., 478, 5104-5111 (2018)>
=2018MNRAS.478.5104L 2018MNRAS.478.5104L (SIMBAD/NED BibCode)
ADC_Keywords: Gravitational lensing ; Redshifts ; Velocity dispersion
Keywords: galaxies: general - distance scale -
large-scale structure of Universe - cosmology: observations -
cosmology: theory
Abstract:
In this paper, we use an unprecedentedly large sample (158) of
confirmed strong lens systems for model selection, comparing five
well-studied Friedmann-Robertson-Walker cosmologies: ΛCDM, wCDM
(the standard model with a variable dark-energy equation of state),
the Rh=ct universe, the (empty) Milne cosmology, and the classical
Einstein-de Sitter (matter-dominated) universe. We first use these
sources to optimize the parameters in the standard model and show that
they are consistent with Planck, though the quality of the best fit is
not satisfactory. We demonstrate that this is likely due to
underreported errors, or to errors yet to be included in this kind of
analysis. We suggest that the missing dispersion may be due to scatter
about a pure single isothermal sphere (SIS) model that is often
assumed for the mass distribution in these lenses. We then use the
Bayes information criterion, with the inclusion of a suggested SIS
dispersion, to calculate the relative likelihoods and ranking of these
models, showing that Milne and Einstein-de Sitter are completely ruled
out, while Rh=ct is preferred over ΛCDM/wCDM with a
relative probability of ∼73 percent versus ∼24 percent. The
recently reported sample of new strong lens candidates by the Dark
Energy Survey, if confirmed, may be able to demonstrate which of these
two models is favoured over the other at a level exceeding 3σ.
Description:
We present 158 strong-lensing systems.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 158 Strong-lensing systems
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Name (JHHMM+DDMM)
13- 18 F6.4 --- zl Lens redshift
20- 25 F6.4 --- zs System redshift
27- 29 I3 km/s sigmaap Observed velocity dispersion measured
within a given aperture
31- 32 I2 km/s e_sigmaap rms uncertainty on sigmaap
34- 37 F4.2 arcsec thetaE Einstein radius
39- 47 A9 --- Survey Survey (1)
49- 52 F4.2 arcsec thetaap Aperture size used to measure the
velocity dispersion
54- 57 F4.2 arcsec thetaeff Half-light radius of the lensing galaxy
59- 61 I3 km/s sigma0 Velocity dispersion
63- 64 I2 km/s e_sigma0 rms uncertainty on sigma0
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Note (1): Surveys as follows:
BELLS = BOSS Emission-Line Lens Survey
(Brownstein et al., 2012ApJ...744...41B 2012ApJ...744...41B)
LSD = Lenses Structure and Dynamics (LSD) survey (Treu & Koopmans,
2002ApJ...575...87T 2002ApJ...575...87T, 2004ApJ...611..739T 2004ApJ...611..739T;
Koopmans & Treu 2003ApJ...583..606K 2003ApJ...583..606K)
SL2S = Strong Lensing Legacy Survey (SL2S; Sonnenfeld et al.,
2013ApJ...777...97S 2013ApJ...777...97S, Cat. J/ApJ/777/97, 2013ApJ...777...98S 2013ApJ...777...98S;
Gavazzi et al. 2014ApJ...785..144G 2014ApJ...785..144G, Cat. J/ApJ/785/144)
SLACS = Sloan Lens ACS (Advanced Camera for Surveys; SLACS) found an
additional 57 confirmed lenses
(Bolton et al., 2008ApJ...682..964B 2008ApJ...682..964B, Cat. J/ApJ/682/964;
Auger et al. 2009ApJ...705.1099A 2009ApJ...705.1099A, Cat. J/ApJ/705/1099)
SLACS2017 = SLACS survey (Shu et al.,
2017ApJS..232...15D 2017ApJS..232...15D, Cat. J/ApJS/232/15)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 05-Oct-2021