J/ApJS/230/9ivo://CDS.VizieR/J/ApJS/230/9doi:10.26093/cds/vizier.22300009CDSNyland K.Lacy M.Sajina A.Pforr J.Farrah D.Wilson G.Surace J.,Haussler B.Vaccari M.Jarvis M.2017-09-04T08:19:21Z2017-08-04T11:02:59ZCDS support team

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

cds-question@unistra.frinfrared-photometryvisible-astronomyWide-band photometrysurveysWe apply The Tractor image modeling code to improve upon existing multi-band photometry for the Spitzer Extragalactic Representative Volume Survey (SERVS). SERVS consists of post-cryogenic Spitzer observations at 3.6 and 4.5{mu}m over five well-studied deep fields spanning 18deg^2^. In concert with data from ground-based near-infrared (NIR) and optical surveys, SERVS aims to provide a census of the properties of massive galaxies out to z~5. To accomplish this, we are using The Tractor to perform "forced photometry." This technique employs prior measurements of source positions and surface brightness profiles from a high-resolution fiducial band from the VISTA Deep Extragalactic Observations survey to model and fit the fluxes at lower-resolution bands. We discuss our implementation of The Tractor over a square-degree test region within the XMM Large Scale Structure field with deep imaging in 12 NIR/optical bands. Our new multi-band source catalogs offer a number of advantages over traditional position-matched catalogs, including (G1) consistent source cross-identification between bands, (2) de-blending of sources that are clearly resolved in the fiducial band but blended in the lower resolution SERVS data, (3) a higher source detection fraction in each band, (4) a larger number of candidate galaxies in the redshift range 5<z<6, and (5) a statistically significant improvement in the photometric redshift accuracy as evidenced by the significant decrease in the fraction of outliers compared to spectroscopic redshifts. Thus, forced photometry using The Tractor offers a means of improving the accuracy of multi-band extragalactic surveys designed for galaxy evolution studies. We will extend our application of this technique to the full SERVS footprint in the future.2017ApJS..230....9Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/230/9CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/334 : VISTA Deep Extragalactic Observations (VIDEO) (Jarvis+, 2013)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)VIII/95 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012)II/317 : The CFHTLS Survey (T0007 release) (Hudelot+ 2012)J/ApJ/592/728 : Lyman break galaxies at redshift z~3 (Steidel+, 2003)J/ApJ/690/1236 : COSMOS photometric redshift catalog (Ilbert+, 2009)J/ApJS/219/39 : QSOs selection from SDSS and WISE (Richards+, 2015)J/A+A/579/A115 : SUDARE-VOICE variability-selection of AGN (Falocco+, 2015)J/A+A/590/A31 : ASTRODEEP Frontier Fields Catalogues (Merlin+, 2016)J/ApJS/225/1 : SpIES: the Spitzer IRAC Equatorial Survey (Timlin+, 2016)http://irsa.ipac.caltech.edu/data/SPITZER/SERVS/ : SERVS data on IRSAhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/230/9https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/230/9http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/230/9https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/230/9https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/230/9http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/230/9GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/230/9/t4_irac (*IRAC-selected output Tractor catalogs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/230/9/t4_irac?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/230/9/t4_irac?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/230/9/t4_irac?GETtext/xml+votable180.050000true36.93761389-4.9987510.005555555555555556Cone search capability for table J/ApJS/230/9/t4_video (*VISTA Deep Extragalactic Observations (VIDEO)-selected output Tractor catalogs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/230/9/t4_video?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/230/9/t4_video?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/230/9/t4_video?GETtext/xml+votable180.050000true36.04586-4.9998840.0055555555555555566/17683 17686 17689 17692 176943.9193497546148093e-20 4.752121017816135e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/230/9?format=asciiInfraredOpticaldefaultJ/ApJS/230/9/t4_irac*IRAC-selected output Tractor catalogsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension, decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination, decimal degrees (J2000)degpos.eq.dec;meta.mainFKs[-0.6/4660]? VIDEO VISTA Ks-band flux (G1)uJyphot.mag;em.IR.Kdoublenullablee_FKs[0.1/420]? Uncertainty in FKsuJystat.errordoublenullableFH[-0.4/5003]? VIDEO VISTA H-band flux (G1)uJyphot.flux.density;em.IR.Hdoublenullablee_FH[0.07/451]? Uncertainty in FHuJystat.errordoublenullableFJ[-0.4/3790]? VIDEO VISTA J-band flux (G1)uJyphot.flux.density;em.IR.Jdoublenullablee_FJ[0.04/342]? Uncertainty in FJuJystat.errordoublenullableFY[-0.4/4660]? VIDEO VISTA Y-band (1.018um) flux (G1)uJyphot.flux.density;em.IR.Jdoublenullablee_FY[0.03/420]? Uncertainty in FYuJystat.errordoublenullableFZ[-0.4/3952]? VIDEO VISTA Z-band (0.8762um) flux (G1)uJyphot.mag;em.opt.Idoublenullablee_FZ[0.02/356]? Uncertainty in FZuJystat.errordoublenullableFi'[-4541/880]? CFHTLS-D1 CFHT i'-band flux (G1)uJyphot.flux.density;em.opt.Idoublenullablee_Fi'[0.003/137]? Uncertainty in Fi'uJystat.errordoublenullableFr'[-1314/946]? CFHTLS-D1 CFHT r'-band flux (G1)uJyphot.flux.density;em.opt.Rdoublenullablee_Fr'[0.002/40]? Uncertainty in Fr'uJystat.errordoublenullableFg'[-32524/658]? CFHTLS-D1 CFHT g'-band flux (G1)uJyphot.mag;em.opt.Bdoublenullablee_Fg'[0.001/976]? Uncertainty in Fg'uJystat.errordoublenullableFz'C[-2230/88906]? CFHTLS-D1 CFHT z'-band flux (G1)uJyphot.mag;em.opt.Idoublenullablee_Fz'C[0.008/2668]? Uncertainty in Fz'CuJystat.errordoublenullableFu'[-614934/17565]? CFHTLS-D1 CFHT u'-band flux (G1)uJyphot.flux.density;em.opt.Udoublenullablee_Fu'[0.002/18449]? Uncertainty in Fu'uJystat.errordoublenullableF3.6[-108/4470]? SERVS Spitzer/IRAC 3.6um flux (G1)uJyphot.mag;em.IR.3-4umdoublenullablee_F3.6[0.3/0.9]? Uncertainty in F3.6uJystat.errordoublenullableF4.5[-19/2629]? SERVS Spitzer/IRAC 4.5um flux (G1)uJyphot.mag;em.IR.4-8umdoublenullablee_F4.5[0.5/0.8]? Uncertainty in F4.5uJystat.errordoublenullableKsmag[14.7/36.8]? VIDEO Ks-band AB magnitudemagphot.mag;em.IR.Kdoublenullablee_Ksmag[0.09/15617]? Uncertainty in Ksmagmagstat.error;phot.mag;em.IR.KdoublenullableHmag[14.6/32.6]? VIDEO H-band AB magnitudemagphot.mag;em.IR.Hdoublenullablee_Hmag[0.09/223]? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.HdoublenullableJmag[14.9/35.4]? VIDEO J-band AB magnitudemagphot.mag;em.IR.Jdoublenullablee_Jmag[0.09/1905]? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JdoublenullableYmag[14.7/32.3]? VIDEO Y-band AB magnitudemagphot.mag;em.IR.Jdoublenullablee_Ymag[0.09/105]? Uncertainty in Ymagmagstat.error;phot.mag;em.opt.BdoublenullableZmag[14.9/36.7]? VIDEO Z-band AB magnitudemagphot.mag;em.opt.Idoublenullablee_Zmag[0.09/3107]? Uncertainty in Zmagmagstat.error;phot.mag;em.opt.Idoublenullablei'mag[16.5/35.1]? CFHTLS-D1 i'-band AB magnitudemagphot.mag;em.opt.Idoublenullablee_i'mag[0.03/129]? Uncertainty in i'magmagstat.error;phot.mag;em.opt.Idoublenullabler'mag[16.4/34.5]? CFHTLS-D1 r'-band AB magnitudemagphot.mag;em.opt.Rdoublenullablee_r'mag[0.03/49]? Uncertainty in r'magmagstat.error;phot.mag;em.opt.Rdoublenullableg'mag[16.8/35.5]? CFHTLS-D1 g'-band AB magnitudemagphot.mag;em.opt.Bdoublenullablee_g'mag[0.03/88]? Uncertainty in g'magmagstat.error;phot.mag;em.opt.Bdoublenullablez'Cmag[11.5/33.4]? CFHTLS-D1 z'-band AB magnitudemagphot.mag;em.opt.Idoublenullablee_z'Cmag[0.03/56]? Uncertainty in z'Cmagmagstat.error;phot.magdoublenullableu'mag[13.2/35.5]? CFHTLS-D1 u'-band AB magnitudemagphot.mag;em.opt.Udoublenullablee_u'mag[0.03/127]? Uncertainty in u'magmagstat.error;phot.magdoublenullable3.6mag[14.7/30.3]? SERVS [3.6] AB magnitudemagphot.mag;em.IR.3-4umdoublenullablee_3.6mag[0.0001/134]? Uncertainty in 3.6magmagstat.errordoublenullable4.5mag[15.3/32.8]? SERVS [4.5] AB magnitudemagphot.mag;em.IR.4-8umdoublenullablee_4.5mag[0.0003/1836]? Uncertainty in 4.5magmagstat.errordoublenullablerChiKs? Tractor reduced chi squared profile fit, Ks (redchi-Ks)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChiH? Tractor reduced chi squared profile fit, H (redchi-H)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChiJ? Tractor reduced chi squared profile fit, J (redchi-J)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChiZ? Tractor reduced chi squared profile fit, Z (redchi-Z)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChiY? Tractor reduced chi squared profile fit, Y (redchi-Y)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChii'? Tractor reduced chi squared profile fit, i' (redchi-i')stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChir'? Tractor reduced chi squared profile fit, r' (redchi-i')stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChig'? Tractor reduced chi squared profile fit, g' (redchi-g')stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChiz'C? Tractor reduced chi squared profile fit, z'C (redchi-z'C)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChiu'? Tractor reduced chi squared profile fit, u' (redchi-u')stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChi3.6[0.4/594125]? Tractor reduced chi squared profile fit, 3.6um (redchi-3.6)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChi4.5[0.4/141297]? Tractor reduced chi squared profile fit, 4.5um (redchi-4.5)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullableBandVIDEO band ([3.6] or [4.5]) used to define source model (Fiducialband)instr.bandpasscharMod[PtSrc] Source surface brightness profile model (all "PtSrc"=point source model) (SourceModel)meta.notecharVIDEODisplay the VISTA Deep Extragalactic Observations (VIDEO; III/334) within 1"meta.ref.urlcharCFHTLSDisplay the CFHTLS Deep Survey (II/317) within 1"meta.ref.urlcharJ/ApJS/230/9/t4_video*VISTA Deep Extragalactic Observations (VIDEO)-selected output Tractor catalogsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension, decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination, decimal degrees (J2000)degpos.eq.dec;meta.mainindexedFKs[-56/187650]? VIDEO VISTA Ks-band flux (G1)uJyphot.mag;em.IR.Kdoublenullablee_FKs[0.1/16889]? Uncertainty in FKsuJystat.errordoublenullableFH[-44/203387]? VIDEO VISTA H-band flux (G1)uJyphot.flux.density;em.IR.Hdoublenullablee_FH[0.1/18305]? Uncertainty in FHuJystat.errordoublenullableFJ[-29/152366]? VIDEO VISTA J-band flux (G1)uJyphot.flux.density;em.IR.Jdoublenullablee_FJ[0.08/13713]? Uncertainty in FJuJystat.errordoublenullableFY[-23/279636]? VIDEO VISTA Y-band flux (G1)uJyphot.flux.density;em.IR.Jdoublenullablee_FY[0.06/25168]? Uncertainty in FYuJystat.errordoublenullableFZ[-17/181329]? VIDEO VISTA Z-band flux (G1)uJyphot.mag;em.opt.Idoublenullablee_FZ[0.03/16320]? Uncertainty in FZuJystat.errordoublenullableFi'[-16031/31876]? CFHTLS-D1 CFHT i'-band flux (G1)uJyphot.flux.density;em.opt.Idoublenullablee_Fi'[0.005/957]? Uncertainty in Fi'uJystat.errordoublenullableFr'[-18950/39642]? CFHTLS-D1 CFHT r'-band flux (G1)uJyphot.flux.density;em.opt.Rdoublenullablee_Fr'[0.004/1190]? Uncertainty in Fr'uJystat.errordoublenullableFg'[-18804/266199]? CFHTLS-D1 CFHT g'-band flux (G1)uJyphot.mag;em.opt.Bdoublenullablee_Fg'[0.003/7986]? Uncertainty in Fg'uJystat.errordoublenullableFz'C[-130457/]? CFHTLS-D1 CFHT z'-band flux (G1)uJyphot.mag;em.opt.Idoublenullablee_Fz'C[0.01/32298]? Uncertainty in Fz'CuJystat.errordoublenullableFu'[-14150/34689]? CFHTLS-D1 CFHT u'-band flux (G1)uJyphot.flux.density;em.opt.Udoublenullablee_Fu'[0.005/1201]? Uncertainty in Fu'uJystat.errordoublenullableF3.6[-50/58703]? SERVS Spitzer/IRAC 3.6um flux (G1)uJyphot.mag;em.IR.3-4umdoublenullablee_F3.6[0.3/2.7]? Uncertainty in F3.6uJystat.errordoublenullableF4.5[-152/71428]? SERVS Spitzer/IRAC 4.5um flux (G1)uJyphot.mag;em.IR.4-8umdoublenullablee_F4.5[0.2/1.6]? Uncertainty in F4.5uJystat.errordoublenullableKsmag[10.7/31.7]? VIDEO Ks-band AB magnitudemagphot.mag;em.IR.Kdoublenullablee_Ksmag[0.09/352]? Uncertainty in Ksmagmagstat.error;phot.mag;em.IR.KdoublenullableHmag[10.6/33.8]? VIDEO H-band AB magnitudemagphot.mag;em.IR.Hdoublenullablee_Hmag[0.09/1249]? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.HdoublenullableJmag[10.9/34.5]? VIDEO J-band AB magnitudemagphot.mag;em.IR.Jdoublenullablee_Jmag[0.09/2108]? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JdoublenullableYmag[10.2/33]? VIDEO Y-band AB magnitudemagphot.mag;em.IR.Jdoublenullablee_Ymag[0.09/406]? Uncertainty in Ymagmagstat.error;phot.mag;em.opt.BdoublenullableZmag[10.7/35.4]? VIDEO Z-band AB magnitudemagphot.mag;em.opt.Idoublenullablee_Zmag[0.09/2106]? Uncertainty in Zmagmagstat.error;phot.mag;em.opt.Idoublenullablei'mag[12.6/35.5]? CFHTLS-D1 i'-band AB magnitudemagphot.mag;em.opt.Idoublenullablee_i'mag[0.03/390]? Uncertainty in i'magmagstat.error;phot.mag;em.opt.Idoublenullabler'mag[12.4/38]? CFHTLS-D1 r'-band AB magnitudemagphot.mag;em.opt.Rdoublenullablee_r'mag[0.03/3027]? Uncertainty in r'magmagstat.error;phot.mag;em.opt.Rdoublenullableg'mag[10.3/37.7]? CFHTLS-D1 g'-band AB magnitudemagphot.mag;em.opt.Bdoublenullablee_g'mag[0.03/1613]? Uncertainty in g'magmagstat.error;phot.mag;em.opt.Bdoublenullablez'Cmag[8.8/36.2]? CFHTLS-D1 z'-band AB magnitudemagphot.mag;em.opt.Idoublenullablee_z'Cmag[0.03/1737]? Uncertainty in z'Cmagmagstat.error;phot.magdoublenullableu'mag[12.5/36.3]? CFHTLS-D1 u'-band AB magnitudemagphot.mag;em.opt.Udoublenullablee_u'mag[0.06/1308]? Uncertainty in u'magmagstat.error;phot.magdoublenullable3.6mag[11.9/33.5]? SERVS [3.6] AB magnitudemagphot.mag;em.IR.3-4umdoublenullablee_3.6mag[/2439]? Uncertainty in 3.6magmagstat.errordoublenullable4.5mag[11.7/34.6]? SERVS [4.5] AB magnitudemagphot.mag;em.IR.4-8umdoublenullablee_4.5mag[/5161]? Uncertainty in 4.5magmagstat.errordoublenullablerChiKs? Tractor reduced chi squared profile fit, Ks (redchi-Ks)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChiH? Tractor reduced chi squared profile fit, H (redchi-H)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChiJ? Tractor reduced chi squared profile fit, J (redchi-J)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChiZ? Tractor reduced chi squared profile fit, Z (redchi-Z)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChiY? Tractor reduced chi squared profile fit, Y (redchi-Y)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChii'? Tractor reduced chi squared profile fit, i' (redchi-i')stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChir'? Tractor reduced chi squared profile fit, r' (redchi-r')stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChig'? Tractor reduced chi squared profile fit, g' (redchi-g')stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChiz'C? Tractor reduced chi squared profile fit, z'C (redchi-z'C)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChiu'? Tractor reduced chi squared profile fit, u' (redchi-u')stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChi3.6? Tractor reduced chi squared profile fit, 3.6um (redchi-3.6)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullablerChi4.5? Tractor reduced chi squared profile fit, 4.5um (redchi-4.5)stat.fit.chi2;stat.fit.param;meta.modelleddoublenullableBandVIDEO band (JHKsYZ) used to define source model (Fiducialband)instr.bandpasscharModSource surface brightness profile model (SourceModel) (1)meta.notecharf_KsSource saturation flag in Ks (1=saturated) (Sat-flag) (2)meta.codeintf_HSource saturation flag in H-band (1=saturated) (Sat-flag) (2)meta.codeintf_JSource saturation flag in J-band (1=saturated) (Sat-flag) (2)meta.codeintf_YSource saturation flag in Y-band (1=saturated) (Sat-flag) (2)meta.codeintf_ZSource saturation flag in Z-band (1=saturated) (Sat-flag) (2)meta.codeintf_i'Source saturation flag in i' (1=saturated) (Sat-flag) (2)meta.codeintf_r'Source saturation flag in r' (1=saturated) (Sat-flag) (2)meta.codeintf_g'Source saturation flag in g' (1=saturated) (Sat-flag) (2)meta.codeintf_z'Source saturation flag in z' (1=saturated) (Sat-flag) (2)meta.codeintf_u'Source saturation flag in u' (1=saturated) (Sat-flag) (2)meta.codeintf_3.6umSource saturation flag in 3.6um (1=saturated) (Sat-flag) (2)meta.codeintf_4.5umSource saturation flag in 4.5um (1=saturated) (Sat-flag) (2)meta.codeintFfitFit flag (Fit-flag) (3)meta.codeintVIDEODisplay the VISTA Deep Extragalactic Observations (VIDEO; III/334) within 1"meta.ref.urlcharCFHTLSDisplay the CFHTLS Deep Survey (II/317) within 1"meta.ref.urlchar