J/MNRAS/470/4838ivo://CDS.VizieR/J/MNRAS/470/4838doi:10.26093/cds/vizier.74704838CDSSluse 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.2024-08-17T20:19:59Z2020-06-13T10:25:44ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgravitational-lensingquasarsredshiftedGalaxies 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 H_0_ 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.2017MNRAS.470.4838Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/470/4838CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/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 fieldshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/470/4838https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/470/4838http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/470/4838https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/470/4838https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/470/4838http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/470/4838GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/470/4838/table1 (Spectroscopic redshift catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/470/4838/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/470/4838/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/470/4838/table1?GETtext/xml+votable180.050000true69.60398-12.334830.005555555555555556Cone search capability for table J/MNRAS/470/4838/list (List of fits spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/470/4838/list?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/470/4838/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/470/4838/list?GETtext/xml+votable180.050000true69.60398-12.334830.0055555555555555566/22580-22581https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/470/4838?format=asciidefaultJ/MNRAS/470/4838/table1Spectroscopic redshift catalogueSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintspShow the spectrummeta.ref.urlcharNameName (1)meta.id;meta.maincharIDIdentification numbermeta.idintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainz? Redshiftsrc.redshiftdoublenullablee_z? Redshift errorstat.error;src.redshiftdoublenullableq_z[0/6]? Redshift quality flag (2)meta.code.qual;src.redshiftintnullableTypeType (3)meta.codecharJ/MNRAS/470/4838/table4Properties of the groups identified in the field of view of HE 0435-1223recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintzgroupGroup mean redshiftsrc.redshift;pos.heliocentricdoublen_zgroup[ab] Notes (1)meta.notecharNNumber of spectroscopically identified galaxies in the groupmeta.numberintsigmaGroup intrinsic velocity dispersion (rounded to 10km/s maximum precision)km/smeta.code.qualinte_sigma1{sigma} standard deviation of sigma from bootstrapkm/sstat.errorintRAcentGroup centroid right ascensiondegpos.eq.raDEcentGroup centroid declinationdegpos.eq.dece_RAcentBootstrap error on the centroid RAarcminstat.errorfloate_DEcentBootstrap error on the centroid DEarcminstat.errorfloatDthetaProjected distance of the centroid to the lensarcsecpos.angDistancefloatlogA3XMedian flexion shift log({DELTA}_3_x)log(arcsec)pos.angDistancefloate_logA3X1{sigma} standard deviation on logA3X from bootstrapping (Section 5).log(arcsec)stat.errorfloatFOVIndicates for which field of view the group is detected (the properties we display correspond to the field of view in first)arcminobs.fieldcharJ/MNRAS/470/4838/tableb1Properties of the groups identified in the field of view of HE 0435-1223, but using Rvir to select the groupsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintzgroupGroup mean redshiftsrc.redshift;pos.heliocentricdoublen_zgroup[ab] Notes (1)meta.notecharNNumber of spectroscopically identified galaxies in the groupmeta.numberintsigmaGroup intrinsic velocity dispersion (rounded to 10km/s maximum precision)km/smeta.code.qualinte_sigma1{sigma} standard deviation of sigma from bootstrapkm/sstat.errorintRAcentGroup centroid right ascensiondegpos.eq.raDEcentGroup centroid declinationdegpos.eq.dece_RAcentBootstrap error on the centroid RAarcminstat.errorfloate_DEcentBootstrap error on the centroid DEarcminstat.errorfloatDthetaProjected distance of the centroid to the lensarcsecpos.angDistancefloatlogA3XMedian flexion shift log({DELTA}_3_x)log(arcsec)pos.angDistancefloate_logA3X1{sigma} standard deviation on logA3X from bootstrapping (Section 5).log(arcsec)stat.errorfloatFOVIndicates for which field of view the group is detected (the properties we display correspond to the field of view in first)arcminobs.fieldcharJ/MNRAS/470/4838/tablec1Virial mass, associated uncertainty and radius of the groups identified in table4.datrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint<zgroup>Group redshiftsrc.redshift;pos.heliocentricfloatlogMvirVirial masslog(solMass)phys.massfloate_logMvirrms uncertainty on logMvirlog(solMass)stat.errorfloatRvirVirial radiusMpcphys.size.radiusfloatJ/MNRAS/470/4838/listList of fits spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablebWaveLower value of wavelength interval0.1nmem.wlfloatBWaveUpper value of wavelength interval0.1nmem.wldoubleWaveWavelenght resolution0.1nmspect.resolutiondoublesizeSize of FITS fileKibytephys.size;meta.fitsintspShow the spectrummeta.ref.urlcharFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar