J/ApJ/806/185 Strong-lensing systems from 4 surveys (Cao+, 2015)
Cosmology with strong-lensing systems.
Cao S., Biesiada M., Gavazzi R., Piorkowska A., Zhu Z.-H.
<Astrophys. J., 806, 185 (2015)>
=2015ApJ...806..185C 2015ApJ...806..185C (SIMBAD/NED BibCode)
ADC_Keywords: Gravitational lensing ; Redshifts ; Velocity dispersion ; Surveys
Keywords: dark energy; galaxies: fundamental parameters;
gravitational lensing: strong
Abstract:
In this paper, we assemble a catalog of 118 strong gravitational
lensing systems from the Sloan Lens ACS Survey (SLACS), BOSS
emission-line lens survey (BELLS), Lens Structure and Dynamics (LSD),
and Strong Lensing Legacy Survey (SL2S) and use them to constrain the
cosmic equation of state. In particular, we consider two cases of dark
energy phenomenology: the XCDM model, where dark energy is modeled by
a fluid with constant w equation-of-state parameter, and in the
Chevalier-Polarski-Linder (CPL) parameterization, where w is allowed
to evolve with redshift, w(z)=w0+w1(z/1+z). We assume spherically
symmetric mass distribution in lensing galaxies, but we relax the
rigid assumption of the SIS model in favor of a more general power-law
index γ, also allowing it to evolve with redshifts γ(z).
Our results for the XCDM cosmology show agreement with values
(concerning both w and γ parameters) obtained by other authors.
We go further and constrain the CPL parameters jointly with
γ(z). The resulting confidence regions for the parameters are
much better than those obtained with a similar method in the past.
They are also showing a trend of being complementary to the Type Ia
supernova data. Our analysis demonstrates that strong gravitational
lensing systems can be used to probe cosmological parameters like the
cosmic equation of state for dark energy. Moreover, they have a
potential to judge whether the cosmic equation of state evolved with
time or not.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 58 118 Compilation of strong-lensing systems
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See also:
J/ApJS/219/29 : Redshifts in strong lens fields (Momcheva+, 2015)
J/ApJ/777/97 : SL2S galaxy-scale lens sample. III. (Sonnenfeld+, 2013)
J/ApJ/749/38 : CFHTLS-SL2S-ARCS strong lens candidates (More+, 2012)
J/ApJ/746/85 : THe HST Cluster Supernova Survey. V. (Suzuki+, 2012)
J/ApJ/705/1099 : The Sloan Lens ACS (SLACS) Survey. IX. (Auger+, 2009)
J/ApJ/690/670 : The Sloan lens ACS Survey. VIII. (Treu+, 2009)
J/ApJ/682/964 : Sloan lens ACS survey. V. (Bolton+, 2008)
J/MNRAS/276/1341 : Spectroscopy of E and S0 galaxies (Jorgensen+, 1995)
J/MNRAS/273/1097 : CCD photometry for E and S0 galaxies (Jorgensen+ 1995)
http://www.sdss3.org/ : SDSS-III home page
http://web.physics.ucsb.edu/~tt/LSD/ : Lens Structure & Dynamics survey
http://www-sl2s.iap.fr/ : CFHTLS-SL2S home page
http://www.slacs.org/ : The Sloan Lens ACS Survey home page
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 Strong-lensing system ID (JHHMM+DDMM)
13- 17 F5.3 --- zl [0.07/1.1] Lens redshift
19- 23 F5.3 --- zs [0.19/3.6] Source redshift
25- 27 I3 km/s Sigma [98/396] Velocity dispersion within
the aperture
29- 30 I2 km/s e_Sigma [8/60] Sigma uncertainty
32- 35 F4.2 arcsec thetaE [0.3/2.6] Angular Einstein radius
37- 41 A5 --- Survey Survey ID (1)
43- 46 F4.2 arcsec thetaAp [0.6/1.5] Aperture radius
48- 51 F4.2 arcsec thetaEff [0.2/4.8] Effective radius
53- 55 I3 km/s Sig0 [103/391] Aperture-corrected velocity
dispersion
57- 58 I2 km/s e_Sig0 [8/61] Sig0 uncertainty
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Note (1): Survey as follows:
BELLS = BOSS Emission-Line Lens Survey
LSD = Lens Structure and Dynamics
SL2S = Strong Lensing Legacy Survey
SLACS = Sloan Lens ACS Survey
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 03-Jun-2016