J/MNRAS/472/2085ivo://CDS.VizieR/J/MNRAS/472/2085doi:10.26093/cds/vizier.74722085CDSChaves-Montero J.Bonoli S.Salvato M.Greisel N.Diaz-Garcia L.A.,Lopez-Sanjuan C.Viironen K.Fernandez-Soto A.Povic M.Ascaso B.,Arnalte-Mur P.Masegosa J.Matute I.Marquez I.Cenarro A. J.,Abramo L.R.Ederoclite A.Alfaro E.J.2024-08-17T20:20:49Z2017-09-29T08:00:39ZCDS support team

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

cds-question@unistra.frquasarsspectrophotometryredshiftedsurveysWe present ELDAR, a new method that exploits the potential of medium- and narrow-band filter surveys to securely identify active galactic nuclei (AGN) and determine their redshifts. Our methodology improves on traditional approaches by looking for AGN emission lines expected to be identified against the continuum, thanks to the width of the filters. To assess its performance, we apply ELDAR to the data of the ALHAMBRA survey, which covered an effective area of 2.38deg^2^ with 20 contiguous medium-band optical filters down to F814W=24.5. Using two different configurations of ELDAR in which we require the detection of at least 2 and 3 emission lines, respectively, we extract two catalogues of type-I AGN. The first is composed of 585 sources (79% of them spectroscopically-unknown) down to F814W=22.5 at z_phot_>1, which corresponds to a surface density of 209 deg-2. In the second, the 494 selected sources (83% of them spectroscopically-unknown) reach F814W=23 at z_phot_>1.5, for a corresponding number density of 176deg^-2^. Then, using samples of spectroscopically-known AGN in the ALHAMBRA fields, for the two catalogues we estimate a completeness of 73% and 67%, and a redshift precision of 1.01% and 0.86% (with outliers fractions of 8.1% and 5.8%). At z>2, where our selection performs best, we reach 85% and 77% completeness and we find no contamination from galaxies.2017MNRAS.472.2085Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/472/2085CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/139/1242 : ALHAMBRA photometric system (Villegas+, 2010)J/MNRAS/441/2891 : ALHAMBRA Survey (Molino+, 2014)J/MNRAS/435/3444 : ALHAMBRA survey morphological catalogue (Povic+, 2013)J/MNRAS/452/549 : ALHAMBRA survey galaxy clusters and groups (Ascaso+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/472/2085https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/472/2085http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/472/2085https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/472/2085https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/472/2085http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/472/2085GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/472/2085/alh2l (ALH2L catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/472/2085/alh2l?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/472/2085/alh2l?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/472/2085/alh2l?GETtext/xml+votable180.050000true356.825815.58430.005555555555555556Cone search capability for table J/MNRAS/472/2085/alh3l (ALH3L catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/472/2085/alh3l?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/472/2085/alh3l?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/472/2085/alh3l?GETtext/xml+votable180.050000true242.585854.70930.0055555555555555565/2856 6/5819 7184-7185 10147 10150 10153 10155-10156 11227 11230 11249 11252 17767 17772-17773 19691-19692 19694-19695 20036 27256 27258-272592.0401237512456292e-19 4.9761815603361e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/472/2085?format=asciidefaultJ/MNRAS/472/2085/alh2lALH2L cataloguezPhotometric redshiftsrc.redshiftfloatMask[0,1] Mask (2)meta.id;instrintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentification number (ALHXLYYY) (1)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainTemp[1/12] Best-fit extragalactic template (3)meta.id;stat.fitintExtBBest-fit colour excessphot.color.excessfloatF814WF814W magnitude (4)magphot.mag;em.opt.Ifloate_F814WF814W uncertainty (4)magstat.errorfloatStell[0,1] Stellarity (1 = point-like sources, 0 = extended sources)src.class.starGalaxyfloatF365W? F365W magnitudemagphot.mag;em.opt.Ufloatnullablee_F365W? F365W uncertaintymagstat.errorfloatnullableF396W? F396W magnitudemagphot.mag;em.opt.Bfloatnullablee_F396W? F396W uncertaintymagstat.errorfloatnullableF427W? F427W magnitudemagphot.mag;em.opt.Bfloatnullablee_F427W? F427W uncertaintymagstat.errorfloatnullableF458W? F458W magnitudemagphot.mag;em.opt.Bfloatnullablee_F458W? F458W uncertaintymagstat.errorfloatnullableF489W? F489W magnitudemagphot.mag;em.opt.Bfloatnullablee_F489W? F489W uncertaintymagstat.errorfloatnullableF520W? F520W magnitudemagphot.mag;em.opt.Vfloatnullablee_F520W? F520W uncertaintymagstat.errorfloatnullableF551W? F551W magnitudemagphot.mag;em.opt.Vfloatnullablee_F551W? F551W uncertaintymagstat.errorfloatnullableF582W? F582W magnitudemagphot.mag;em.opt.Vfloatnullablee_F582W? F582W uncertaintymagstat.errorfloatnullableF613W? F613W magnitudemagphot.mag;em.opt.Rfloatnullablee_F613W? F613W uncertaintymagstat.errorfloatnullableF644W? F644W magnitudemagphot.mag;em.opt.Rfloatnullablee_F644W? F644W uncertaintymagstat.errorfloatnullableF675W? F675W magnitudemagphot.mag;em.opt.Rfloatnullablee_F675W? F675W uncertaintymagstat.errorfloatnullableF706W? F706W magnitudemagphot.mag;em.opt.Rfloatnullablee_F706W? F706W uncertaintymagstat.errorfloatnullableF737W? F737W magnitudemagphot.mag;em.opt.Rfloatnullablee_F737W? F737W uncertaintymagstat.errorfloatnullableF768W? F768W magnitudemagphot.mag;em.opt.Ifloatnullablee_F768W? F768W uncertaintymagstat.errorfloatnullableF799W? F799W magnitudemagphot.mag;em.opt.Ifloatnullablee_F799W? F799W uncertaintymagstat.errorfloatnullableF830W? F830W magnitudemagphot.mag;em.opt.Ifloatnullablee_F830W? F830W uncertaintymagstat.errorfloatnullableF861W? F861W magnitudemagphot.mag;em.opt.Ifloatnullablee_F861W? F861W uncertaintymagstat.errorfloatnullableF892W? F892W magnitudemagphot.mag;em.opt.Ifloatnullablee_F892W? F892W uncertaintymagstat.errorfloatnullableF923W? F923W magnitudemagphot.mag;em.opt.Ifloatnullablee_F923W? F923W uncertaintymagstat.errorfloatnullableF954W? F954W magnitudemagphot.mag;em.opt.Ifloatnullablee_F954W? F954W uncertaintymagstat.errorfloatnullableFJ? NIR-J magnitudemagphot.flux.density;em.IR.Jfloatnullablee_FJ? NIR-J uncertaintymagstat.errorfloatnullableFH? NIR-H magnitudemagphot.flux.density;em.IR.Hfloatnullablee_FH? NIR-H uncertaintymagstat.errorfloatnullableFKs? NIR-Ks magnitudemagphot.mag;em.IR.Kfloatnullablee_FKs? NIR-Ks uncertaintymagstat.errorfloatnullableline1Band where the OVI+Lyman beta complex is detected (5)instr.bandpassintlog(SNRl1)log_10(SNR) in the band where the OVI+Lyman beta complex is detectedstat.snrfloatlog(Slin1)log_10(Slin) in the band where the OVI+Lyman beta complex is detectedstat.fit.goodnessfloatline2Band where the Lyman alpha line is detected (5)instr.bandpassintlog(SNRl2)log_10(SNR) in the band where the Lyman alpha line is detectedstat.snrfloatlog(Slin2)log_10(Slin) in the band where the Lyman alpha line is detectedstat.fit.goodnessfloatline3Band where the SiIV+OIV complex is detected (5)instr.bandpassintlog(SNRl3)log_10(SNR) in the band where the SiIV+OIV complex is detectedstat.snrfloatlog(Slin3)log_10(Slin) in the band where the SiIV+OIV complex is detectedstat.fit.goodnessfloatline4Band where the CIV line is detected (5)instr.bandpassintlog(SNRl4)log_10(SNR) in the band where the CIV line is detectedstat.snrfloatlog(Slin4)log_10(Slin) in the band where the CIV line complex is detectedstat.fit.goodnessfloatline5Band where the CIII] line is detected (5)instr.bandpassintlog(SNRl5)log_10(SNR) in the band where the CIII] line is detectedstat.snrfloatlog(Slin5)log_10(Slin) in the band where the CIII] line is detectedstat.fit.goodnessfloatline6Band where the MgII line is detected (5)instr.bandpassintlog(SNRl6)log_10(SNR) in the band where the MgII line is detectedstat.snrfloatlog(Slin6)log_10(Slin) in the band where the MgII line is detected (5)stat.fit.goodnessfloatSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/472/2085/alh3lALH3L catalogueline4Band where the CIV line is detected (5)instr.bandpassintMask[0,1] Mask (2)meta.id;instrintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentification number (ALHXLYYY) (1)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainzPhotometric redshiftsrc.redshiftfloatTemp[1/12] Best-fit extragalactic template (3)meta.id;stat.fitintExtBBest-fit colour excessphot.color.excessfloatF814WF814W magnitude (4)magphot.mag;em.opt.Ifloate_F814WF814W uncertainty (4)magstat.errorfloatStell[0,1] Stellarity (1 = point-like sources, 0 = extended sources)src.class.starGalaxyfloatF365W? F365W magnitudemagphot.mag;em.opt.Ufloatnullablee_F365W? F365W uncertaintymagstat.errorfloatnullableF396W? F396W magnitudemagphot.mag;em.opt.Bfloatnullablee_F396W? F396W uncertaintymagstat.errorfloatnullableF427W? F427W magnitudemagphot.mag;em.opt.Bfloatnullablee_F427W? F427W uncertaintymagstat.errorfloatnullableF458W? F458W magnitudemagphot.mag;em.opt.Bfloatnullablee_F458W? F458W uncertaintymagstat.errorfloatnullableF489W? F489W magnitudemagphot.mag;em.opt.Bfloatnullablee_F489W? F489W uncertaintymagstat.errorfloatnullableF520W? F520W magnitudemagphot.mag;em.opt.Vfloatnullablee_F520W? F520W uncertaintymagstat.errorfloatnullableF551W? F551W magnitudemagphot.mag;em.opt.Vfloatnullablee_F551W? F551W uncertaintymagstat.errorfloatnullableF582W? F582W magnitudemagphot.mag;em.opt.Vfloatnullablee_F582W? F582W uncertaintymagstat.errorfloatnullableF613W? F613W magnitudemagphot.mag;em.opt.Rfloatnullablee_F613W? F613W uncertaintymagstat.errorfloatnullableF644W? F644W magnitudemagphot.mag;em.opt.Rfloatnullablee_F644W? F644W uncertaintymagstat.errorfloatnullableF675W? F675W magnitudemagphot.mag;em.opt.Rfloatnullablee_F675W? F675W uncertaintymagstat.errorfloatnullableF706W? F706W magnitudemagphot.mag;em.opt.Rfloatnullablee_F706W? F706W uncertaintymagstat.errorfloatnullableF737W? F737W magnitudemagphot.mag;em.opt.Rfloatnullablee_F737W? F737W uncertaintymagstat.errorfloatnullableF768W? F768W magnitudemagphot.mag;em.opt.Ifloatnullablee_F768W? F768W uncertaintymagstat.errorfloatnullableF799W? F799W magnitudemagphot.mag;em.opt.Ifloatnullablee_F799W? F799W uncertaintymagstat.errorfloatnullableF830W? F830W magnitudemagphot.mag;em.opt.Ifloatnullablee_F830W? F830W uncertaintymagstat.errorfloatnullableF861W? F861W magnitudemagphot.mag;em.opt.Ifloatnullablee_F861W? F861W uncertaintymagstat.errorfloatnullableF892W? F892W magnitudemagphot.mag;em.opt.Ifloatnullablee_F892W? F892W uncertaintymagstat.errorfloatnullableF923W? F923W magnitudemagphot.mag;em.opt.Ifloatnullablee_F923W? F923W uncertaintymagstat.errorfloatnullableF954W? F954W magnitudemagphot.mag;em.opt.Ifloatnullablee_F954W? F954W uncertaintymagstat.errorfloatnullableFJ? NIR-J magnitudemagphot.flux.density;em.IR.Jfloatnullablee_FJ? NIR-J uncertaintymagstat.errorfloatnullableFH? NIR-H magnitudemagphot.flux.density;em.IR.Hfloatnullablee_FH? NIR-H uncertaintymagstat.errorfloatnullableFKs? NIR-Ks magnitudemagphot.mag;em.IR.Kfloatnullablee_FKs? NIR-Ks uncertaintymagstat.errorfloatnullableline1Band where the OVI+Lyman beta complex is detected (5)instr.bandpassintlog(SNRl1)log_10(SNR) in the band where the OVI+Lyman beta complex is detectedstat.snrfloatlog(Slin1)log_10(Slin) in the band where the OVI+Lyman beta complex is detectedstat.fit.goodnessfloatline2Band where the Lyman alpha line is detected (5)instr.bandpassintlog(SNRl2)log_10(SNR) in the band where the Lyman alpha line is detectedstat.snrfloatlog(Slin2)log_10(Slin) in the band where the Lyman alpha line is detectedstat.fit.goodnessfloatline3Band where the SiIV+OIV complex is detected (5)instr.bandpassintlog(SNRl3)log_10(SNR) in the band where the SiIV+OIV complex is detectedstat.snrfloatlog(Slin3)log_10(Slin) in the band where the SiIV+OIV complex is detectedstat.fit.goodnessfloatlog(SNRl4)log_10(SNR) in the band where the CIV line is detectedstat.snrfloatlog(Slin4)log_10(Slin) in the band where the CIV line complex is detectedstat.fit.goodnessfloatline5Band where the CIII] line is detected (5)instr.bandpassintlog(SNRl5)log_10(SNR) in the band where the CIII] line is detectedstat.snrfloatlog(Slin5)log_10(Slin) in the band where the CIII] line is detectedstat.fit.goodnessfloatline6Band where the MgII line is detected (5)instr.bandpassintlog(SNRl6)log_10(SNR) in the band where the MgII line is detectedstat.snrfloatlog(Slin6)log_10(Slin) in the band where the MgII line is detected (5)stat.fit.goodnessfloatSimbadSimbad column added by the CDSmeta.ref.urlchar