J/ApJS/279/22ivo://CDS.VizieR/J/ApJS/279/22CDSTsan T.Malkan M.Edelson R.Smith K.Stern D.Graham M.2026-05-22T12:35:59Z2026-05-22T13:27:54ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleivisible-astronomyspectroscopyline-intensitiesredshiftedinfrared-sourcesWe utilized the Edelson & Malkan (2012, J/ApJ/751/52) and Stern+ 2012ApJ...753...30S selection techniques and other methods to identify active galactic nuclei (AGN) candidates that were monitored during the Kepler prime and K2 missions. Subsequent to those observations, we obtained 125 long-slit optical spectra with the Lick 3m telescope, 58 spectra with the Palomar 5m telescope, and three spectra with the Keck 10m telescope to test these identifications. Of these 186 AGN candidates, 105 were confirmed as Type 1 AGN and 35 as Type 2 AGN, while the remaining 46 were found to have other identifications (e.g., stars and normal galaxies). This indicated an overall reliability of ~75%, while the two main methods had much higher reliability, 87%-96%. The spectra indicated redshifts out to z=3.4. Then, we examined the AGN sample properties through the Baldwin-Phillips-Terlevich diagram and compared the AGNs' spectral energy distributions with those from the literature. We found that our sample yielded the same AGN population as those identified through other methods, such as optical spectroscopy.2025ApJS..279...22Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/279/22CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/30 : Second ROSAT PSPC Catalog (ROSAT, 2000)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron-Cetty+ 2010)II/328 : AllWISE Data Release (Cutri+ 2013)IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)J/ApJ/613/682 : AGN central masses (Peterson+, 2004)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/ApJ/751/52 : AGN cand. from the WISE, 2MASS, RASS (W2R) (Edelson+, 2012)J/MNRAS/423/600 : Type-1 low-z AGN emission properties (Stern+, 2012)J/MNRAS/426/2703 : Type 1 AGN at low z. II. (Stern+, 2012)J/MNRAS/431/836 : Type 1 AGN at low z. III. (Stern+, 2013)J/ApJ/795/38 : Phot./sp. measurements for KA1858+4850 (Pei+, 2014)J/ApJS/219/18 : LIRAS: LoCuSS IR AGN survey (Xu+, 2015)J/MNRAS/476/2501 : AGN short time-scale optical variability (Aranzana+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/279/22https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/279/22http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/279/22https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/279/22https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/279/22http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/279/22GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/279/22/targets (Observed AGN candidates in Kepler Prime and K2 fields (Table 1) and line measurements (Table 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/279/22/targets?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/279/22/targets?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/279/22/targets?GETtext/xml+votable180.050000true9.9533333.3718330.0055555555555555566/267 270 295 301 307 349 375 481 1031-1032 1037 1047 1053 4705 4730 14579 14582 14586 14591 14732 14735 14755 14757 14760-14762 14765 14777 14781 14783 14819 14824-14825 14827 14915-14916 14918 14921 14924 14928 14931 14933 14935-14937 14943 14946 14955 14957 14959 15040-15041 15043 15061 15076 15105-15106 15112 15115-15116 15119 15122 15126 15128-15129 15131 15135-15136 15138 15143 15147 15150 15153 15155-15158 15169-15170 15172 15178 17323 17330 17333 17383 18123 18133 18139 18169 18173 18213 18310 18337 18362 18466 18499 18525 18539 18545 18549 18570 18581 18585 18588 18610 18612 18627 18642 18661 18664 18696 18721 18723 18735 23485 23510 23514 23526 23548-23549 23967 24027 24033 24120 24201 24210 24230-24231 24251 24257 24260 24288 24299 24349 24390 25429 25435 25458 25552-25553 25563 25591 26118 26142 26165 26902 26978 27654 29315 29357 29698 30720 42929 42959 42975 44311 44358 44374 44378 44391 44406 48478-48479 48500 48503 48826https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/279/22?format=asciiOpticalInfrareddefaultJ/ApJS/279/22/targetsObserved AGN candidates in Kepler Prime and K2 fields (Table 1) and line measurements (Table 2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/186] Sequential identifier, this workmeta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[1/51] Degree of Declination (J2000)pos.eq.dec;meta.mainCampKepler Campaign(s)meta.id;obscharKeplerID[2694186/248018164]? Kepler identifier (1)meta.idlongnullableEM12Results of Edelson & Malkan (2012, J/ApJ/751/52) technique (2)meta.id;src.samplecharS12Results, Stern+ 2012ApJ...753...30S technique (3)meta.codecharTypeAGN Type (4)meta.code.classcharObsObservatory ("Keck", "Palomar" or "Lick")meta.id;instr.obstycharCommComment(s)meta.notecharzspec[0/3.33]? Spectroscopic redshiftsrc.redshiftfloatnullablee_zspec[0.0001/0.005]? Uncertainty in zspecstat.error;src.redshiftfloatnullableFeaturesSpectral Featuresmeta.id;spect.linelogL-bCIV[44/45.1]? Log, luminosity, broad [CIV], erg/s (1)log(1e-07W)phys.luminosityfloatnullableEW-bCIV[23.8/266]? Equivalent width, broad [CIV] (1)0.1nmspect.line.eqWidthfloatnullableFWHM-bCIV[2510/10060]? FWHM, broad [CIV] (1)km.s**-1spect.line.widthintnullablelogL-bCIII[42.3/45]? Log, luminosity, broad CIII], erg/s (1)log(1e-07W)phys.luminosityfloatnullableEW-bCIII[22.8/243.2]? Equivalent width, broad CIII] (1)0.1nmspect.line.eqWidthfloatnullableFWHM-bCIII[2910/10800]? FWHM, broad CIII] (1)km.s**-1spect.line.widthintnullablelogL-bMgII[41/44.2]? Log, luminosity, broad [MgII], erg/s (1)log(1e-07W)phys.luminosityfloatnullableEW-bMgII[2.6/194]? Equivalent width, broad [MgII] (1)0.1nmspect.line.eqWidthfloatnullableFWHM-bMgII[1210/11800]? FWHM, broad [MgII] (1)km.s**-1spect.line.widthintnullablelogL-bHb[40.5/44]? Log, luminosity, broad H{beta}, erg/s (1)log(1e-07W)phys.luminosityfloatnullableEW-bHb[4/644.5]? Equivalent width, broad H{beta} (1)0.1nmspect.line.eqWidthfloatnullableFWHM-bHb[1060/21250]? FWHM, broad H{beta} (1)km.s**-1spect.line.widthintnullablelogL-Hb[39/42]? Log, luminosity, H{beta}, erg/s (1)log(1e-07W)phys.luminosity;em.line.HbetafloatnullableEW-Hb[1.7/61.2]? Equivalent width, H{beta} (1)0.1nmspect.line.eqWidth;em.line.HbetafloatnullableFWHM-Hb[270/1010]? FWHM, H{beta} (1)km.s**-1spect.line.width;em.line.HbetaintnullablelogL-bHa[40.8/43.5]? Log, luminosity, broad H{alpha}, erg/s (1)log(1e-07W)phys.luminosityfloatnullableEW-bHa[42.8/958]? Equivalent width, broad H{alpha} (1)0.1nmspect.line.eqWidthfloatnullableFWHM-bHa[1130/6280]? FWHM, broad H{alpha} (1)km.s**-1spect.line.widthintnullablelogL-Ha[39/42]? Log, luminosity, H{alpha}], erg/slog(1e-07W)phys.luminosity;em.line.HalphafloatnullableEW-Ha[2/260.1]? Equivalent width, H{alpha}0.1nmspect.line.eqWidth;em.line.HalphafloatnullableFWHM-Ha[190/970]? FWHM, H{alpha}km.s**-1spect.line.width;em.line.HalphaintnullableCommentCommentmeta.notechar