J/ApJ/962/104ivo://CDS.VizieR/J/ApJ/962/104CDSFeuillet L.M.Melendez M.Kraemer S.Schmitt H.R.Fischer T.C.,Reeves J.N.2026-06-24T10:52:52Z2026-06-24T11:43:26ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleivisible-astronomyspectroscopyredshiftedseyfert-galaxiesWe select a sample of 1437 active galactic nuclei (AGN) from the catalog of the Sloan Digital Sky Survey galaxy properties from the Portsmouth group by detection of the high-ionization [NeV]3426{AA} emission line. We compare the fluxes of [NeIII]3869{AA}, [OIII]5007{AA}, [OII]3726,3728{AA}, and [OI]6300{AA} to that of [NeV]. All four lines show a strong linear correlation with [NeV], although lines from ions with lower ionization potentials have a lower correlation coefficient. We investigate the use of two forbidden line ratio diagnostic diagrams that do not rely on H{alpha} in order to classify high-redshift galaxies. These use the [NeIII]/[OII] line ratio plotted against [OIII]/[OI] and [OIII]/[OII], respectively. We use photoionization modeling to characterize the behavior of the narrow-line region in AGN and star-forming regions and test the validity of our diagnostic diagrams. We also use a luminosity cutoff of logL[OIII][erg/s]=42, which lowers the contamination of the AGN region by star-forming galaxies down to 10% but does not remove green pea and purple grape galaxies from the AGN region. We also investigate the OHNO diagram, which uses [NeIII]/[OII] plotted against [OIII]/H{beta}. Using our new diagnostic diagrams, we are able to reliably classify AGN up to a redshift of z<=1.06 and add more than 822 new AGN to the [NeV]-selected AGN sample.2024ApJ...962..104Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/962/104CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)J/AJ/127/2002 : Star Formation Rate of NFGS galaxies (Kewley+, 2004)J/A+A/485/657 : Physical param. of Wolf-Rayet galaxies (Brinchmann+, 2008)J/MNRAS/383/581 : Broad-line Balmer decrements in blue AGN (Dong+, 2008)J/MNRAS/398/1165 : AGN in nearby galaxies (Goulding+, 2009)J/ApJ/728/38 : AEGIS: demographics of X-ray and optical AGN (Yan+, 2011)http://www.sdss4.org/dr12/spectro/galaxy_portsmouth/ : Portsmouth grouphttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/962/104https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/962/104http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/962/104https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/962/104https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/962/104http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/962/104GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/962/104/table4 (Final AGN list containing the original [NeV] selected sample, and the previously unclassified galaxies determined to be AGN)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/962/104/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/962/104/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/962/104/table4?GETtext/xml+votable180.050000true7.8130.040.0055555555555555565/168 513 1103 1400 2856 4441 6/14 34-35 41 641 648 662 678 682 685-686 694-695 747 755 766 2048 2051 2056-2058 2060 2063-2064 2069-2070 2074 2084 2094 2097 2114 2117 2123 2125 2130 2138 2145 2161 2165 2172 2184 2198 2206-2207 2211 2221 2226 2231 2238 2250 2564 2575 2578 2585 4097 4100 4109 4112-4113 4117 4122 4144 4155 4158 4181 4191 4196 4210-4211 4221-4222 4230 4243 4247 4256 4273 4293 4295 4297 4311 4313 4317 4322 4327 4344 4352 4358 4365 4374 4383-4384 4394 4404 4411 4423 4431 4433 4439-4440 4446 4453-4455 4462 4468 4471 4490 4496 4500 4503 4515 4518 4521-4522 4527 4535 4540 4546 4552 4556 4564 4566 4590 4594 4598 4618 4620 4625 4659-4661 4666 4681 4704 4734 4741 4747 4752 4769 4772 4777 4786 4792 4799 4803 4807 4832 4840-4841 4864 4869 4874 4876-4877 4883 4886 4891 4915 4917 4919 4947 4952 4957 4959 4965 4976 4983 4994 5000 5002 5005 5016-5017 5032 5045 5050-5051 5061 5068 5076 5082 5118 5122 5124-5125 5135 5140 5146-5147 5152 5156 5165 5172 5183 5197 5203 5206 5213-5214 5232 5242 5249 5256-5257 5261 5272-5273 5277 5286 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11372 11378 11386 11392 11396 11398 11400 11403-11404 11407 11411-11413 11416 11428 11430 11432-11433 11439 11441 11453 11456-11457 11471 11477 11489 11495 11532 11544 11556 11651 11783 11786 11789 11794 11823 11826 11829 11850-11851 11854 11858 11873 11904 11906 11914 11924 11934 11936 11938 12310-12311 12319 12362 12370 12384 12572 12619 12637 12646 12651 12665 12669 12765-12767 13327 13343-13344 13359 13368 13385 13389-13390 13399 13455-13456 13468 13471 13474 13489 13592 17247 17254 17273 17297 17302 17344 17358 17368 17380 17401 17487 17501 17503 17511 17519 17521-17522 17567 17605 17612-17613 17615 17618 17624 17628 17630 17638 17640 17648-17650 17652 17658 17664-17665 17669-17670 17674-17675 17677-17678 17680-17681 17684 17691 17697 17702 17710 17713 17722 17729 17742-17743 17746 17752-17754 17758 17760 17763 17770 17772-17773 17776 17781 17798 17801 17803 17805 17809 17818-17819 17821-17822 17838 17840 17844 17895 17898 17907 17931 17940 17949 17951 17955 17958 17961-17962 17993 17997 18024 18027 18029 18034 18042 18046 18056 18065 18067 18073-18074 18077 18080 18084 18087-18089 18096-18097 18115 18130 18144 18156 18167 18176 18185-18186 18196 18199 18207 18210 18220-18221 18225-18226 18231 18233 18236 18238 18243 18249 18253 18264 18287 18295 18302 18305 18307 18309 18313 18319-18320 18326-18327 18343 18345 18351 18359 18376 18381 18387-18388 18391 18401 18404-18406 18408 18417 18422-18423 18425 18429-18430 18674-18675 18677-18678 18683-18684 18746 18751 18762 18765 18780 18784-18785 18788-18789 18793 18797 18807 18823 18826 18832 18837 18840 18842 18844 18852 18858 18864 18872 18875 18909 18911 18916-18917 18919 18927 18933 19040 19042 19048 19050 19055 19060 19080 19085 19089 19093 19100-19101 19109 19116 19119-19122 19124 19128 19133 19137 19142-19143 19153 19156 19169-19170 19183 19185 19189-19190 19195 19208 19217 19229 19232-19234 19236-19237 19253 19260 19270 19275 19284 19286 19294 19296 19302 19318 19321 19324 19333 19352 19359 19366 19381-19382 19389 19391 19415 19431 19444 19462 19468 19472 19489-19490 19496 19498 19500 19502 19529 19533 19536 19551 19575 19579 19583 19585 19591 19593 19598 19607 19617 19624-19625 19631 19636 19646 19655 19664 19666 19669-19671 19673-19674 19678 19698-19700 19715 19727 19730 19732 19755 19757 19761 19766-19767 19774 19783 19799-19801 19805 19808 19814 19821 19827 19833 19838-19840 19860 19864 19874 19881 19887 19890 19892-19893 19910-19911 19919 19922-19923 19933-19935 19937 19939 19942-19943 19949 19952 19955 19964-19965 19973 19977 19980 19991 20001 20008-20009 20013-20014 20030 20036 20038-20039 20044 20054 20063-20065 20070 20088 20090-20091 20095-20096 20103 20108 20110 20114 20120 20128 20133 20143 20148 20167 20170 20174 20177 20193-20194 20204 20210 20218-20219 20223 20228 20256 20262 20272-20274 20284 20292 20304 20309 20318 20321-20323 20337 20340 20348 20351-20352 20375 20378 20382-20383 20386-20387 20392 20399 20408 20415-20416 20418 20435 20437 21843-21844 21852 21855 21863 21866 21881 21884 21908 21916 21961 21966-21969 21971 21974 21977 21989 22005 22360 22362 22367 22390 22399 25593 25595 25822 25925 25943 25972 25975 25980 25988 26010 26012 26014 26019 26026 26031 26051 26054-26055 26064 26068 26074 26079 26083 26085 26090 26111 26165 26177 26183 26194 26201-26202 26206 26208 26213 26217-26218 26220 26232-26233 26235 26251 26273 26275 26278 26282-26283 26289 26293 26299 26318 26321 26323 26328 26330-26331 26334 26355 26362 26365 26367 26377 26379 26394-26395 26401 26412 26414 26421 26441 26443 26445-26446 26453 26475 26490 26496 26509 26511 26516-26517 26533 26539 26545 26554 26597 26614-26615 26623 26868 26876 26878-26879 26937 26956 26958 26960 26962 26968 26970 26973-26974 26982 26991 27009 27013 27029 27037 27054 27056 27063-27065 27073 27076 27089 27092 27100 27116 27119 27121 27130 27133 27199 27205 27208-27209 27214 27220 27223-27225 27229 27235 27255 27263 27279 27282 27290 27293-27294 27297 27305 27311-27313 27328 27336-27338 27358 27364 27368 27389 27391 27394 27401 27427 27430 27435 27439 27448 27451 27486 27495 27505 27510 27513 27518 27523 27525 27529 27537 27540-27542 27563 27572 27581 27596 27598 27607 27620 27657 27661 27666 27697 27700-27701 27709 27719 27727-27728 27735 27738-27739 27743 27754 27756 27758 27760 27763 27768-27769 27773 27777 27799 27816 27818-27819 27821 27830 27832 27847 27851 27854 27860 27862 27880 27904 27913 27924 27930 27932 27937 27952 27959 27972 27976 27989 28010 28022 28024 28031 28045 28047 28050-28051 28054-28056 28064 28072-28073 28077-28078 28086-28088 28093-28095 28109-28110 28123-28124 28130 28134 28141 28148-28149 28152 28154-28155 28165-28166 28169 28173 28181 28194 28202 28207 28211 28214 28218 28221 28234 28243 28246 28275 28280 28295 28297 28300 28303 28312-28313 28316 28323 28325 28331 28336 28338 28346 28348-28349 28357-28358 28370 28372 28375 28384 28386-28387 28389 28402 28405 28407 28409-28411 28418 28425-28426 28438 28443-28444 28447 28451 28459 28478-28479 28491 28502 28515 28518 28526-28527 28531 28537 28556 28573-28574 28582 28589 28599 28608 28632 28636-28637 28640-28641 28650 28653 28655 28665-28667 31380 31387 31391-31392 31397-31398 31401 31406 31425 31431 31437 31445 31451 31456 31463 31472 31474 31616 31629 31633 31640 31643 31654 31658-31659 31672 31687 31689 31698-31699 31708 31720-31721 31725 31739-31740 32425 32439 32445 32447 32474 32489 32491 32494 32504 32698 36765 36767 36780-36781 36786 36798 36810 36835-36836 36841 36859 45046 45048 45053 45055 49119https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/962/104?format=asciiOpticaldefaultJ/ApJ/962/104/table4Final AGN list containing the original [NeV] selected sample, and the previously unclassified galaxies determined to be AGNrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypePortsmouth group BPT classification (1)src.classcharz[0.168/1.1] Galaxy spectroscopic redshiftsrc.redshiftfloatRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-10.81/68.3] Declination (J2000)degpos.eq.dec;meta.mainNeV[0/7.8e+15] The [NeV] emission line flux (2)1e-19W.m**-2.nm**-1phot.flux;spect.linedoubleNeIII[0/5.7e+9] The [NeIII] emission line flux (2)1e-19W.m**-2.nm**-1phot.flux;spect.linedoubleOI[/1.71e+18]? The [OI] emission line flux (2)1e-19W.m**-2.nm**-1phot.flux;spect.linedoublenullableOII[0/4.4e+11] The [OII] emission line flux (2)1e-19W.m**-2.nm**-1phot.flux;spect.linedoubleOIII[0/5.21e+8] The [OIII] emission line flux (2)1e-19W.m**-2.nm**-1phot.flux;spect.line;em.line.OIIIdoubleHb[0/8.24e+8] The H{beta} emission line flux (2)1e-19W.m**-2.nm**-1phot.flux;spect.line;em.line.HbetadoubleOHNOIn AGN region of OHNO diagram methodmeta.codecharFLRIn AGN region of 3D [OII]-FLR diagram?meta.codecharAGNGalaxy had a [NeV] SNR>3?meta.codecharSloanDisplay the online SDSS-DR12 data for the nearest objectmeta.ref.urlchar