J/ApJ/851/48 SLACS. XIII. Galaxy-scale strong lens candidates (Shu+, 2017)
The Sloan Lens ACS Survey.
XIII. Discovery of 40 new galaxy-scale strong lenses.
Shu Y., Brownstein J.R., Bolton A.S., Koopmans L.V.E., Treu T.,
Montero-Dorta A.D., Auger M.W., Czoske O., Gavazzi R., Marshall P.J.,
Moustakas L.A.
<Astrophys. J., 851, 48 (2017)>
=2017ApJ...851...48S 2017ApJ...851...48S
ADC_Keywords: Gravitational lensing; Redshifts; Photometry, HST; Optical;
Velocity dispersion; Galaxies, spectra; Stars, masses
Keywords: dark matter ; galaxies: evolution ; gravitational lensing: strong ;
methods: observational ; techniques: image processing
Abstract:
We present the full sample of 118 galaxy-scale strong-lens candidates
in the Sloan Lens ACS (SLACS) Survey for the Masses (S4TM) Survey,
which are spectroscopically selected from the final data release of
the Sloan Digital Sky Survey. Follow-up Hubble Space Telescope (HST)
imaging observations confirm that 40 candidates are definite strong
lenses with multiple lensed images. The foreground-lens galaxies are
found to be early-type galaxies (ETGs) at redshifts 0.06-0.44, and
background sources are emission-line galaxies at redshifts 0.22-1.29.
As an extension of the SLACS Survey, the S4TM Survey is the first
attempt to preferentially search for strong-lens systems with
relatively lower lens masses than those in the pre-existing
strong-lens samples. By fitting HST data with a singular isothermal
ellipsoid model, we find that the total projected mass within the
Einstein radius of the S4TM strong-lens sample ranges from
3x1010M☉ to 2x1011M☉. In Shu+ (2015ApJ...803...71S 2015ApJ...803...71S),
we have derived the total stellar mass of the S4TM lenses to be
5x1010M☉ to 1x1012M☉. Both the total enclosed mass and
stellar mass of the S4TM lenses are on average almost a factor of 2
smaller than those of the SLACS lenses, which also represent the
typical mass scales of the current strong-lens samples. The extended
mass coverage provided by the S4TM sample can enable a direct test,
with the aid of strong lensing, for transitions in scaling relations,
kinematic properties, mass structure, and dark-matter content trends
of ETGs at intermediate-mass scales as noted in previous studies.
Description:
HST imaging observations of the Sloan Lens ACS (SLACS) Survey for the
Masses (S4TM) Survey sample were carried out in the F814W-band with
the Wide Field Channel (WFC) of the ACS camera under the Snapshot
Program #12210 in Cycle 18 (PI: A. Bolton).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 82 118 Selected properties of the Sloan Lens ACS (SLACS)
Survey for the Masses (S4TM) sample
table2.dat 64 40 Strong-lens model parameters of the 40 S4TM grade-A
lenses
--------------------------------------------------------------------------------
See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
J/ApJ/682/964 : Sloan lens ACS survey. V. (Bolton+, 2008)
J/ApJS/176/19 : COSMOS: strong lens systems (Faure+, 2008)
J/ApJ/705/1099 : The Sloan Lens ACS (SLACS) Survey. IX. (Auger+, 2009)
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/ApJ/777/97 : SL2S galaxy-scale lens sample. III. (Sonnenfeld+, 2013)
J/ApJ/785/144 : SL2S galaxy-scale sample of lens candidates (Gavazzi+, 2014)
J/MNRAS/465/3558 : HATLAS candidate lensed galaxies (Negrello+, 2017)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- Target SDSS system name (SDSSJHHMM+DDMM)
16- 19 I4 --- Plate SDSS plate number
20 A1 --- --- [-]
21- 25 I5 d MJD SDSS Modified Julian Date
26 A1 --- --- [-]
27- 29 I03 --- Fiber SDSS fiber number
31- 36 F6.4 --- zL [0.04/0.45] Foreground lens redshift
inferred from SDSS spectrum
38- 43 F6.4 --- zS [0.17/1.3] Background source redshift
inferred from SDSS spectrum
45- 47 I3 km/s Sigma [0/406] SDSS stellar velocity dispersion
49- 50 I2 km/s e_Sigma [0/98] Sigma uncertainty
52- 56 F5.2 mag Imag [14.7/19.1] Apparent AB magnitude of the lens
galaxy in the HST/ACS F814W band inferred
from the de Vaucouleurs model (I814)
58- 61 F4.2 mag Ai [0.01/0.3] Galactic dust extinction
ΔI814 (1)
63- 67 F5.2 arcsec Reff [0.5/10] Effective radius
69- 72 F4.2 --- q [0.4/1] Minor-to-major axis ratio
74- 76 I3 deg PA [1/177] Major-axis position angle of the lens
galaxy with respect to the north
78- 82 A5 --- Class Classification (2)
--------------------------------------------------------------------------------
Note (1): Galactic dust extinction values based on
Schlegel+ (1998ApJ...500..525S 1998ApJ...500..525S) maps; should be subtracted from the
observed magnitude to give the dust-corrected magnitude.
Note (2): The classification with codes denoting the foreground-lens morphology,
the foreground-lens multiplicity, and the status of the system as a
lens based on the available data.
Morphology is coded by "E" for early-type (elliptical and S0) and
"L" for late-type (Sa and later).
Multiplicity is coded by "S" for single and "M" for multiple.
Lens status is coded by "A" for systems with clear and convincing
evidence of multiple imaging, "M" for systems with possible evidence
of multiple imaging, and "X" for nonlenses.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- Target SDSS system name (SDSSJHHMM+DDMM)
16- 19 F4.2 arcsec bSIE [0.5/1.7] Einstein radius
21- 24 F4.2 --- q [0.4/1] Minor-to-major axis ratio
26- 28 I3 deg PA [0/169] Major-axis position angle of the SIE
component with respect to the north
30 I1 --- Ns [1/4] Number of Sersic components used
32- 34 I3 --- mu [2/105] The average magnification
36- 40 F5.2 [Msun] logMein [10.5/11.4] Total projected mass within the
Einstein radius from the best-fit lens model
42- 46 F5.2 [Msun] logM [10.7/12.1] Estimated stellar mass assuming
a Chabrier IMF from Shu+ (2015ApJ...803...71S 2015ApJ...803...71S)
48- 52 F5.2 --- fDM [-0.2/0.7] The inferred dark-matter fraction
within half of the half-light radius
54- 58 I5 --- chi2 [6631/37313] χ2 value
60- 64 I5 --- dof [9356/24778] Degree of freedom
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Bolton et al. Paper I. 2006ApJ...638..703B 2006ApJ...638..703B
Treu et al. Paper II. 2006ApJ...640..662T 2006ApJ...640..662T
Koopmans et al. Paper III. 2006ApJ...649..599K 2006ApJ...649..599K
Gavazzi et al. Paper IV. 2007ApJ...667..176G 2007ApJ...667..176G
Bolton et al. Paper V. 2008ApJ...682..964B 2008ApJ...682..964B Cat. J/ApJ/682/964
Gavazzi et al. Paper VI. 2008ApJ...677.1046G 2008ApJ...677.1046G
Bolton et al. Paper VII. 2008ApJ...684..248B 2008ApJ...684..248B
Treu et al. Paper VIII. 2009ApJ...690..670T 2009ApJ...690..670T Cat. J/ApJ/690/670
Auget et al. Paper IX. 2009ApJ...705.1099A 2009ApJ...705.1099A Cat. J/ApJ/705/1099
Auger et al. Paper X. 2010ApJ...724..511A 2010ApJ...724..511A
Newton et al. Paper XI. 2011ApJ...734..104N 2011ApJ...734..104N
Shu et al. Paper XII. 2015ApJ...803...71S 2015ApJ...803...71S
Shu et al. Paper XIII. 2017ApJ...851...48S 2017ApJ...851...48S This catalog
(End) Emmanuelle Perret [CDS] 23-Sep-2019