J/MNRAS/470/4838 Redshift catalog of HE 0435-1223 field-of-view (Sluse+, 2017)
H0LiCOW. II. Spectroscopic survey and galaxy-group identification of the strong
gravitational lens system HE 0435-1223.
Sluse D., Sonnenfeld A., Rumbaugh N., Rusu C.E., Fassnacht C.D., Treu T.,
Suyu S.H., Wong K.C., Auger M.W., Bonvin V., Collett T., Courbin F.,
Hilbert S., Koopmans L.V.E., Marshall P.J., Meylan G., Spiniello C.,
Tewes M.
<Mon. Not. R. Astron. Soc., 470, 4838-4857 (2017)>
=2017MNRAS.470.4838S 2017MNRAS.470.4838S (SIMBAD/NED BibCode)
ADC_Keywords: Gravitational lensing ; QSOs ; Redshifts
Keywords: gravitational lensing: strong - galaxies: groups: general -
quasars: individual: HE 0435-1223
Abstract:
Galaxies located in the environment or along the line of sight towards
gravitational lenses can significantly affect lensing observables, and
can lead to systematic errors on the measurement of H0 from the
time-delay technique. We present the results of a systematic
spectroscopic identification of the galaxies in the field of view of
the lensed quasar HE 0435-1223 using the W.M. Keck, Gemini and
ESO-Very Large telescopes. Our new catalogue triples the number of
known galaxy redshifts in the direct vicinity of the lens, expanding
to 102 the number of measured redshifts for galaxies separated by less
than 3 arcmin from the lens. We complement our catalogue with
literature data to gather redshifts up to 15 arcmin from the lens, and
search for galaxy groups or clusters projected towards HE 0435-1223.
We confirm that the lens is a member of a small group that includes at
least 12 galaxies, and find 8 other group candidates near the line of
sight of the lens. The flexion shift, namely the shift of lensed
images produced by high-order perturbation of the lens potential, is
calculated for each galaxy/group and used to identify which objects
produce the largest perturbation of the lens potential. This analysis
demonstrates that (i) at most three of the five brightest galaxies
projected within 12 arcsec of the lens need to be explicitly used in
the lens models, and (ii) the groups can be treated in the lens model
as an external tidal field (shear) contribution.
Description:
Our data set combines multi-object spectroscopy obtained at
Gemini-South, Keck, and ESO-Paranal observatories.
The catalogue contains 534 unique objects, including 368 redshifts
exclusively reported by MOM15 (Momcheva et al., 2015, Cat.
J/ApJS/219/29). Our new measurement expands to 169 the number of
targeted objects separated by less than 3 arcmin from the lens.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 83 534 Spectroscopic redshift catalogue
table4.dat 74 9 Properties of the groups identified in the field
of view of HE 0435-1223
tableb1.dat 74 7 Properties of the groups identified in the field
of view of HE 0435-1223,
but using Rvir to select the groups
tablec1.dat 23 9 Virial mass, associated uncertainty and radius
of the groups identified in table4.dat
list.dat 141 174 List of fits spectra
fits/* . 174 Individual fits spectra
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See also:
J/MNRAS/467/4220 : Galaxies inside 120 arcsec of HE 0435-1223 (Rusu+, 2017)
J/MNRAS/465/4914 : R-band light curves of HE 0435-1223 (Bonvin+, 2017)
J/ApJS/219/29 : Spectroscopic redshifts in strong lens fields
(Momcheva+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 24 A24 --- Name Name (1)
26- 30 I5 --- ID Identification number
32- 40 F9.6 deg RAdeg Right ascension (J2000)
42- 51 F10.6 deg DEdeg Declination (J2000)
53- 61 F9.6 --- z ?=99 Redshift
63- 71 F9.6 --- e_z ?=99 Redshift error
73 I1 --- q_z [0/6]? Redshift quality flag (2)
75- 83 A9 --- Type Type (3)
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Note (1): Format: InstrumentdateobjID, where instrument is FORS, Gemini or
Keck if the redshift is derived from our survey, and Momcheva if the redshift
comes from MOM15 (Momcheva et al., 2015, Cat. J/ApJS/219/29).
The "date" in format yyyymmdd is the date of observation, or 201508 for
objects from MOM15 (Momcheva et al., 2015, Cat. J/ApJS/219/29).
Note (2): Redshift quality flag as follows:
0 = secure redshift, from this program
1 = tentative redshift, from this program
2 = unreliable/unknown redshift, from this program
3 = data obtained with LDSS-3, for objects from MOM15
(Momcheva et al., 2015, Cat. J/ApJS/219/29)
4 = data obtained with IMACS, for objects from MOM15
(Momcheva et al., 2015, Cat. J/ApJS/219/29)
5 = data obtained with Hectospec, for objects from MOM15
(Momcheva et al., 2015, Cat. J/ApJS/219/29)
6 = NED objects, for objects from MOM15
(Momcheva et al., 2015, Cat. J/ApJS/219/29)
Note (3): Type as follows:
ETG-Sx = CaK-H and/or G band are detected
M-dwarf = M-dwarf star
Star = other stellar-types
Starburst = clear emission lines are observed
Unknown = no identification could be done or if the spectrum is from
an external catalogue
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Byte-by-byte Description of file: table4.dat tableb1.dat
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Bytes Format Units Label Explanations
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1- 7 F7.5 --- zgroup Group mean redshift
8 A1 --- n_zgroup [ab] Notes (1)
10- 11 I2 --- N Number of spectroscopically identified
galaxies in the group
13- 16 I4 km/s sigma Group intrinsic velocity dispersion
(rounded to 10km/s maximum precision)
18- 20 I3 km/s e_sigma 1σ standard deviation of sigma
from bootstrap
22- 30 F9.6 deg RAcent Group centroid right ascension
32- 41 F10.6 deg DEcent Group centroid declination
43- 46 F4.2 arcmin e_RAcent Bootstrap error on the centroid RA
48- 51 F4.2 arcmin e_DEcent Bootstrap error on the centroid DE
53- 57 F5.1 arcsec Dtheta Projected distance of the centroid
to the lens
59- 63 F5.2 [arcsec] logA3X Median flexion shift log({DELTA}3x)
65- 68 F4.2 [arcsec] e_logA3X 1σ standard deviation on logA3X
from bootstrapping (Section 5).
70- 74 A5 arcmin FOV Indicates for which field of view the group
is detected (the properties we display
correspond to the field of view in first)
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Note (1): Notes as follows:
a = Galaxy members drop to 8 if a radius of 15 arcmin is considered.
The centroid location does not change but the velocity dispersion
drops to sigma=233±63km/s.
b = Possibly bimodal groups constituted of two (or more) subgroups.
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Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 6 F6.4 --- Group redshift
8- 12 F5.2 [Msun] logMvir Virial mass
14- 17 F4.2 [Msun] e_logMvir rms uncertainty on logMvir
19- 23 F5.3 Mpc Rvir Virial radius
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.6 deg RAdeg Right Ascension of center (J2000)
11- 20 F10.6 deg DEdeg Declination of center (J2000)
22- 25 I4 --- Nx Number of pixels along X-axis
27- 49 A23 "datime" Obs.date Observation date
51- 57 F7.2 0.1nm bWave Lower value of wavelength interval
59- 66 F8.2 0.1nm BWave Upper value of wavelength interval
68- 74 F7.5 0.1nm Wave Wavelenght resolution
76- 77 I2 Kibyte size Size of FITS file
79-109 A31 --- FileName Name of FITS file, in subdirectory fits
111-141 A31 --- Title Title of the FITS file
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History:
From electronic version of the journal
References:
Suyu et al., Paper I 2017MNRAS.468.2590S 2017MNRAS.468.2590S
Rusu et al., Paper III 2017MNRAS.467.4220R 2017MNRAS.467.4220R, Cat. J/MNRAS/467/4220
Wong et al., Paper IV 2017MNRAS.465.4895W 2017MNRAS.465.4895W
Bonvin et al., Paper V 2017MNRAS.465.4914B 2017MNRAS.465.4914B, Cat. J/MNRAS/465/4914
Ding et al., Paper VI 2017MNRAS.465.4634D 2017MNRAS.465.4634D
Ding et al., Paper VII 2017MNRAS.472...90D 2017MNRAS.472...90D
Tihhonova et al., Paper VIII 2018MNRAS.477.5657T 2018MNRAS.477.5657T
Birrer et al., Paper IX 2019MNRAS.484.4726B 2019MNRAS.484.4726B
Sluse et al., Paper X 2019MNRAS.490..613S 2019MNRAS.490..613S
(End) Patricia Vannier [CDS] 24-Apr-2020