J/MNRAS/504/3662ivo://CDS.VizieR/J/MNRAS/504/3662doi:10.26093/cds/vizier.75043662CDSLemaux B.C.Fuller S.Bradac M.Pentericci L.Hoag A.Strait V.,Treu T.Alvarez C.Bolan P.Gandhi P.J.Jones T.Mason C.,Pelliccia D.Ribeiro B.Ryan R.E.Schmidt K.B.Vanzella E.,Khusanova Y.Le Fevre O.Guaita L.Hathi N.P.Koekemoer A.Pforr J.2024-08-21T20:17:44Z2021-05-14T09:21:38ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomygravitational-lensingredshiftedline-intensitiesWe study the projected spatial offset between the ultraviolet continuum and Lya emission for 65 lensed and unlensed galaxies in the Epoch of Reionization 5<=z<=7, the first such study at these redshifts, in order to understand the potential for these offsets to confuse estimates of the Lya properties of galaxies observed in slit spectroscopy. While we find that ~40% of galaxies in our sample show significant projected spatial offsets, |Delta_Lya-UV_|, we find a relatively modest average (median) projected offset of |Delta_Lya-UV_|=0.61+/-0.08 proper kpc for the entire sample. A small fraction of our sample, ~10%, exhibit offsets in excess of 2 proper kpc, with offsets seen up to ~4 proper kpc, sizes that are considerably larger than the effective radii of typical galaxies at these redshifts. An internal comparison and a comparison to studies at lower redshift yielded no significant evidence of evolution of Delta_Lya-UV with redshift. In our sample, UV-bright galaxies (with a median L_UV_/L*_UV_=0.67) showed offsets a factor of three greater than their fainter counterparts (median L_UV_/L*_UV_=0.10), 0.89 +/-0.18 vs. 0.27+/-0.05 proper kpc, respectively. The presence of companion galaxies and early-stage merging activity appeared to be unlikely causes of these offsets. Rather, these offsets appear consistent with a scenario in which internal anisotropic processes resulting from stellar feedback, which is stronger in UV-brighter galaxies, facilitate Lya fluorescence and/or backscattering from nearby or outflowing gas. The reduction in the Lya flux due to offsets was quantified. It was found that the differential loss of Lya photons for galaxies with average offsets is not, if corrected for, a limiting factor for all but the narrowest slit widths (<0.4"). However, for the largest offsets, if they are mostly perpendicular to the slit major axis, slit losses were found to be extremely severe in cases where slit widths of <=1" were employed, such as those planned for James Webb Space Telescope/NIRSpec observations.2021MNRAS.504.3662Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/504/3662CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/504/3662https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/504/3662http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/504/3662https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/504/3662https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/504/3662http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/504/3662GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/504/3662/table1 (unlensed galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/504/3662/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/504/3662/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/504/3662/table1?GETtext/xml+votable180.050000true53.2020264-27.8163530.005555555555555556Cone search capability for table J/MNRAS/504/3662/table2 (lensed galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/504/3662/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/504/3662/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/504/3662/table2?GETtext/xml+votable180.050000true3.592285-30.4099110.0055555555555555566/6383 6539 8915 8921 16486 17690 17741 18475 25540 25675 27258 28448 34793 35935 46885 49012https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/504/3662?format=asciiOpticaldefaultJ/MNRAS/504/3662/table1unlensed galaxiesIDNamemeta.id;meta.maincharre? Intrinsic measured F160W effective radius, in proper_kpc unit (G1)phys.size.radiusfloatnullableE_re? 1sigma positive error on re, in proper_kpc unit (G1)stat.error;stat.maxfloatnullablee_re? 1sigma negative error on re, in proper_kpc unit (G1)stat.errorfloatnullableLUVnormIntrinsic UV luminosity normalized by the characteristic UV luminosity at the galaxy's redshiftphys.luminosity;em.UVfloatlogLyalumLog10 of the intrinsic Lya line luminosity in cgs unitslog(1e-07W)phys.luminosity;em.UVfloatEWLyaMeasured rest-frame equivalent width of the Lyman alpha feature0.1nmspect.line.eqWidthintSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainzspecSpectral redshiftsrc.redshiftfloat|deltaLya-UV|Absolute value of the projected spatial offset between the Lya and UV continuum emission, in proper_kpc unitpos.angDistancefloate_|deltaLya-UV|1sigma error on |delta_Lya-UV_|, in proper_kpc unitstat.errorfloatJ/MNRAS/504/3662/table2lensed galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDInternal ID, NNNN.NNmeta.id;meta.maincharRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainzspecSpectral redshiftsrc.redshiftfloat|deltaLya-UV|Absolute value of the projected spatial offset between the Lya and UV continuum emission, in proper_kpc unit (1)pos.angDistancefloate_|deltaLya-UV|1sigma error on |delta_Lya-UV|, in proper_kpc unit (1)stat.errorfloatre? Intrinsic measured F160W effective radius, in proper_kpc unit (G1) (1)phys.size.radiusfloatnullableE_re? 1sigma positive error on re, in proper_kpc unit (G1) (1)stat.error;stat.maxfloatnullablee_re[]? 1sigma negative error on re, in proper_kpc unit (G1) (1)stat.errorfloatnullableLUVnormIntrinsic UV luminosity normalized by the characteristic UV luminosity at the galaxy's redshift (1)phys.luminosity;em.UVfloatlogLyalumLog10 of the intrinsic Lya line luminosity in cgs units (1)log(1e-07W)phys.luminosity;em.UVfloatEWLyaMeasured rest-frame equivalent width of the Lyman alpha feature0.1nmspect.line.eqWidthintMagniMagnification from best-fit lensing map evaluated at the spectral redshiftphot.flux;arith.ratiofloatSimbadNameSimbad column added by the CDSmeta.idcharnullable