J/ApJ/854/29ivo://CDS.VizieR/J/ApJ/854/29doi:10.26093/cds/vizier.18540029CDSMaseda M.V.van der Wel A.Rix H.-W.Momcheva I.Brammer G.B.,Franx M.Lundgren B.F.Skelton R.E.Whitaker K.E.2023-12-12T01:21:29Z2023-10-06T15:52:00ZCDS support team

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

cds-question@unistra.frdwarf-galaxiesvisible-astronomyspectroscopyredshiftedline-intensitiesThe multiplexing capability of slitless spectroscopy is a powerful asset in creating large spectroscopic data sets, but issues such as spectral confusion make the interpretation of the data challenging. Here we present a new method to search for emission lines in the slitless spectroscopic data from the 3D-HST survey utilizing the Wide-Field Camera 3 on board the Hubble Space Telescope. Using a novel statistical technique, we can detect compact (extended) emission lines at 90% completeness down to fluxes of 1.5(3.0)x10^-17^erg/s/cm^2^, close to the noise level of the grism exposures, for objects detected in the deep ancillary photometric data. Unlike previous methods, the Bayesian nature allows for probabilistic line identifications, namely redshift estimates, based on secondary emission line detections and/or photometric redshift priors. As a first application, we measure the comoving number density of Extreme Emission Line Galaxies (restframe [OIII]{lambda}5007 equivalent widths in excess of 500{AA}). We find that these galaxies are nearly 10x more common above z~1.5 than at z<~0.5. With upcoming large grism surveys such as Euclid and WFIRST, as well as grisms featured prominently on the NIRISS and NIRCam instruments on the James Webb Space Telescope, methods like the one presented here will be crucial for constructing emission line redshift catalogs in an automated and well-understood manner.2018ApJ...854...29Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/854/29CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/172/70 : zCOSMOS-bright catalog, DR3 (Lilly+, 2007)J/ApJ/668/853 : Spectroscopy of UltraStrong Emission Line gal. (Kakazu+, 2007)J/AJ/135/1624 : PEARS emission-line galaxies (Straughn+, 2008)J/ApJ/742/111 : Extreme emission-line galaxies in CANDELS (van der Wel+, 2011)J/ApJ/772/48 : Emission-line galaxies from PEARS. II. (Pirzkal+, 2013)J/A+A/568/L8 : VUDS extreme emission line 0.2<~z<~0.9 gal. (Amorin+, 2014)J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014)J/A+A/578/A105 : EELGs out to z~1 in zCOSMOS (Amorin+, 2015)J/ApJS/225/27 : 3D-HST Survey: grism spectra master catalog (Momcheva+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/854/29https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/854/29http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/854/29https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/854/29https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/854/29http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/854/29GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/854/29/table4 (Confirmed high-EW [OIII] and/or H{alpha} emitters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/854/29/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/854/29/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/854/29/table4?GETtext/xml+votable180.050000true215.1079752.9318310.005555555555555556Cone search capability for table J/ApJ/854/29/table5 (Plausible high-EW [OIII] emitters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/854/29/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/854/29/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/854/29/table5?GETtext/xml+votable180.050000true214.8212152.7348250.005555555555555556Cone search capability for table J/ApJ/854/29/table1 (Grism and spectroscopic redshifts in GOODS-N)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/854/29/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/854/29/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/854/29/table1?GETtext/xml+votable180.050000true189.0852966362.169052120.0055555555555555566/11252 11425 17679 17690 27258 35935https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/854/29?format=asciiOpticaldefaultJ/ApJ/854/29/table4Confirmed high-EW [OIII] and/or H{alpha} emittersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifier from Skelton+ (2014, J/ApJS/214/24)meta.id;meta.maincharRAJ2000[34.2/215.2] Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-28/62.4] Declination (J2000)degpos.eq.dec;meta.mainzgrism[0.66/2.4] Grism redshiftsrc.redshift;pos.heliocentricfloatFHa[0.037/19]? H{alpha} flux; in 10^-17^erg/cm^2^/s1e-17mW.m**-2phot.flux;em.line.Halphafloatnullablee_FHa[0.0006/3]? FHa uncertainty1e-17mW.m**-2stat.errordoublenullableEWHa[18.4/71700]? Restframe H{alpha} equivalent width in {AA}0.1nmspect.line.eqWidthfloatnullablee_EWHa[6/1.13e+06]? EWHa uncertainty0.1nmstat.errordoublenullableFOIII[0.04/23.4]? [OIII] Flux; in 10^-17^erg/cm^2^/s1e-17mW.m**-2phot.fluxfloatnullablee_FOIII[0.006/4.1]? FOIII uncertainty1e-17mW.m**-2stat.errordoublenullableEWOIII[5.98/1.84e+06]? Restframe [OIII]equivalent width in {AA}0.1nmspect.line.eqWidthdoublenullablee_EWOIII[2.7/7.4e+8]? EWOIII uncertainty0.1nmstat.errordoublenullableM16Display data from Momcheva+ 2016, J/ApJS/225/27 within 0.3"meta.ref.urlcharJ/ApJ/854/29/table5Plausible high-EW [OIII] emittersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifier from Skelton+ (2014, J/ApJS/214/24)meta.id;meta.maincharRAJ2000[34.2/215.1] Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-28/62.4] Declination (J2000)degpos.eq.dec;meta.mainlambda[10830/16900] Wavelength0.1nmem.wlintFlux[0.5/19] Line Flux in 10^-17^erg/cm^2^/s1e-17mW.m**-2phot.flux;spect.linefloate_Flux[0.13/3.3] Flux uncertainty1e-17mW.m**-2stat.error;phot.fluxfloatEW[501/2880000] Restframe line equivalent width in {AA}0.1nmspect.line.eqWidthinte_EW[79/2.2e+9] EW uncertainty0.1nmstat.error;spect.line.eqWidthdoubleM16Display data from Momcheva+ 2016, J/ApJS/225/27 within 0.3"meta.ref.urlcharJ/ApJ/854/29/table1Grism and spectroscopic redshifts in GOODS-NID[5878/32925] ID from Skelton+ 2014, J/ApJS/214/24 (<[SWM2014] GOODS-N NNNNN> in Simbad)meta.id;meta.mainintSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintzgrism[0.7/3.3] Grism redshift from this worksrc.redshift;pos.heliocentricfloatzspec[0.4/3.3] Spectroscopic redshift from Skelton+ 2014, J/ApJS/214/24src.redshift;pos.heliocentricfloatz3DHST[0.3/3.24] Redshifts from Momcheva+ 2016, J/ApJS/225/27src.redshift;pos.heliocentricfloat_RAPositions from Skelton+ 2014, J/ApJS/214/24 (right ascension part)degpos.eq.ra;meta.main_DEPositions from Skelton+ 2014, J/ApJS/214/24 (declination part)degpos.eq.dec;meta.main