J/MNRAS/488/3745 Galaxy-scale strong gravitational lensing sample (Chen+, 2019)
Assessing the effect of lens mass model in cosmological application with
updated galaxy-scale strong gravitational lensing sample.
Chen Y., Li R., Shu Y., Cao X.
<Mon. Not. R. Astron. Soc., 488, 3745-3758 (2019)>
=2019MNRAS.488.3745C 2019MNRAS.488.3745C (SIMBAD/NED BibCode)
ADC_Keywords: Gravitational lensing ; Galaxies ; Redshifts ;
Velocity dispersion ; Optical
Keywords: gravitational lensing: strong - Galaxies: structure -
cosmological parameters - cosmology: observations
Abstract:
By comparing the dynamical and lensing masses of early-type lens
galaxies, one can constrain both the cosmological parameters and the
density profiles of galaxies. We explore the constraining power on
cosmological parameters and the effect of the lens mass model in this
method with 161 galaxy-scale strong lensing systems, which is
currently the largest sample with both high-resolution imaging and
stellar dynamical data. We assume a power-law mass model for the
lenses, and consider three different parametrizations for γ
(i.e. the slope of the total mass density profile) to include the
effect of the dependence of γ on redshift and surface mass
density. When treating δ (i.e. the slope of the luminosity
density profile) as a universal parameter for all lens galaxies, we
find the limits on the cosmological parameter Ωm are quite
weak and biased, and also heavily dependent on the lens mass model in
the scenarios of parametrizing γ with three different forms.
When treating δ as an observable for each lens, the unbiased
estimate of Ωm can be obtained only in the scenario of
including the dependence of γ on both the redshift and the
surface mass density, that is Ωm=0.381+0.185-0.154 at 68
per cent confidence level in the framework of a flat ΛCDM
model. We conclude that the significant dependencies of γ on
both the redshift and the surface mass density, as well as the
intrinsic scatter of δ among the lenses, need to be properly
taken into account in this method.
Description:
We have compiled a galaxy-scale SGL sample including 161 systems with
the gravitational lensing and stellar velocity dispersion
measurements, which are selected with strict criteria to satisfy the
assumption of spherical symmetry on the lens mass model. Actually, the
selected lenses are all ETGs with E/S0 morphologies.
Five systems are taken from the LSD survey (Koopmans & Treu
2002ApJ...568L...5K 2002ApJ...568L...5K, 2003ApJ...583..606K 2003ApJ...583..606K; Treu & Koopmans
2002ApJ...575...87T 2002ApJ...575...87T, 2004ApJ...611..739T 2004ApJ...611..739T), 26 from the SL2S (Ruff et
al. 2011ApJ...727...96R 2011ApJ...727...96R; Sonnenfeld et al. 2013ApJ...777...98S 2013ApJ...777...98S,
Sonnenfeld et al. 2013ApJ...777...97S 2013ApJ...777...97S, Cat. J/ApJ/777/97; Sonnenfeld
et al. 2015ApJ...800...94S 2015ApJ...800...94S), 57 from the SLACS (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, 2010ApJ...724..511A 2010ApJ...724..511A), 38
from the an extension of the SLACS survey known as 'SLACS for the
Masses' (hereafter S4TM, Shu et al. 2015ApJ...803...71S 2015ApJ...803...71S; Shu et al.
2017ApJ...851...48S 2017ApJ...851...48S, Cat. J/ApJ/851/48), 21 from the BELLS (Brownstein
et al. 2012ApJ...744...41B 2012ApJ...744...41B), and 14 from the BELLS for GALaxy-Ly
α EmitteR sYstemsGALLERY (hereafter BELLS GALLERY, Shu et al.
2016ApJ...824...86S 2016ApJ...824...86S, Cat. J/ApJ/824/86, 2016ApJ...833..264S 2016ApJ...833..264S).
The useful information of these 161 systems is listed in Table A1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 82 161 The selected galaxy-scale SGL systems
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See also:
J/ApJ/777/97 : SL2S galaxy-scale lens sample. III. (Sonnenfeld+, 2013)
J/ApJ/682/964 : Sloan lens ACS survey. V. (Bolton+, 2008)
J/ApJ/705/1099 : The Sloan Lens ACS (SLACS) Survey. IX. (Auger+, 2009)
J/ApJ/851/48 : SLACS. XIII. Galaxy-scale strong lens candidates (Shu+, 2017)
J/ApJ/824/86 : The BOSS emission-line lens survey. III. (Shu+, 2016)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Lens name
20- 25 F6.4 --- zl Lens redshift
27- 32 F6.4 --- zs Source redshift
34- 37 F4.2 arcsec thetaE Einstein angle
39- 42 F4.2 arcsec thetaeff Effective radius
44- 52 A9 --- slit Angular sizes of width and length of the
rectangular aperture (in arcsecxarcsec)
54- 56 F3.1 arcsec Fiberrad ? Angular radius of the fiber
58- 61 F4.2 arcsec thetaap Angular radius of the circular aperture (1)
63- 65 I3 km/s sigap Velocity dispersion measured inside the
circular aperture with the angular radius
θap
67- 68 I2 km/s e_sigap Error on sigap
70- 82 A13 --- Survey Survey name (2)
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Note (1): For the rectangular aperture the corresponding equivalent value
is derived as θap∼1.025sqrt(θxθy/π), where
θx and θy are the angular sizes of width and length
of the rectangular aperture
Note (2): Survey as follows:
LSD = Lens Structure and Dynamics survey (Koopmans & Treu
2002ApJ...568L...5K 2002ApJ...568L...5K, 2003ApJ...583..606K 2003ApJ...583..606K; Treu & Koopmans
2002ApJ...575...87T 2002ApJ...575...87T, 2004ApJ...611..739T 2004ApJ...611..739T) (5/161)
SL2S = Strong Lensing Legacy Survey (Sonnenfeld et al.
2013ApJ...777...97S 2013ApJ...777...97S, Cat. J/ApJ/777/97) (26/161)
SLACS = Sloan Lens ACS survey (Bolton et al. 2008ApJ...682..964B 2008ApJ...682..964B,
Cat. J/ApJ/682/964) (57/161)
S4TM = Extension of the SLACS survey known as 'SLACS for the Masses'
(Shu et al. 2017ApJ...851...48S 2017ApJ...851...48S, Cat. J/ApJ/851/48) (38/161)
BELLS = Baryon Oscillation Spectroscopic Survey (BOSS) emission-line
lens survey (Brownstein et al. 2012ApJ...744...41B 2012ApJ...744...41B) (21/161)
BELLS GALLERY = BELLS for GALaxy-Ly α EmitteR sYstems (Shu et al.
2016ApJ...824...86S 2016ApJ...824...86S, Cat. J/ApJ/824/86) (14/161)
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 16-Dec-2022