J/MNRAS/483/4847ivo://CDS.VizieR/J/MNRAS/483/4847doi:10.26093/cds/vizier.74834847CDSKeel W.C.Bennert V.N.Pancoast A.Harris C.E.Nierenberg A.,Chojnowski S.D.Moiseev A.V.Oparin D.V.Lintott C.J.Schawinski K.,Mitchell G.Cornen C.2024-08-19T20:16:05Z2022-08-11T13:28:07ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiinterstellar-mediumseyfert-galaxiesWe consider active galactic nucleus (AGN) photoionization of gas in companion galaxies (cross-ionization) as a way to sample the intensity of AGN radiation in both direction and time, independent of the gas properties of the AGN host galaxies. From an initial set of 212 AGN+companion systems, identified with the help of Galaxy Zoo participants, we obtained long-slit optical spectra of 32 pairs that were a priori likely to show cross-ionization based on projected separation or angular extent of the companion. From emission-line ratios, 10 of these systems are candidates for cross-ionization, roughly the fraction expected if most AGNs have ionization cones with 70{deg} opening angles. Among these, Was 49 remains the strongest nearby candidate. NGC 5278/9 and UGC 6081 are dual-AGN systems with tidal debris, complicating identification of cross-ionization. The two weak AGNs in the NGC 5278/9 system ionize gas filaments to a projected radius 14kpc from each galaxy. In UGC 6081, an irregular high-ionization emission region encompasses both AGNs, extending more than 15kpc from each. The observed AGN companion galaxies with and without signs of external AGN photoionization have similar distributions in estimated incident AGN flux, suggesting that geometry of escaping radiation or long-term variability controls this facet of the AGN environment. This parallels conclusions for luminous QSOs based on the proximity effect among Lyman {alpha} absorbers. In some galaxies, mismatch between spectroscopic classifications in the common BPT diagram and the intensity of weaker HeII and [NeV] emission lines highlights the limits of common classifications in low-metallicity environments.2019MNRAS.483.4847Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/483/4847CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/483/4847https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/483/4847http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/483/4847https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/483/4847https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/483/4847http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/483/4847GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/483/4847/tablea1 (Finding list: Low redshift AGN/companion galaxy pairs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/483/4847/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/483/4847/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/483/4847/tablea1?GETtext/xml+votable180.050000true4.28295831.25180560.0055555555555555566/4178 4196 4202 4222 4263 4317 4341 4349 4374 4431 4524 4635 4656 4785 5002 5082 5084 5091 5204 5208 5210 5244 5246 5274 5362 5364 5395 5397 5413 5423 5448 5530 5534 5552 5579 5587 5594 5708 5964 5967 5970 5988 6000 6017 6021 6216 6225 6241 6420 6423 6434 6440 6444-6445 6476 6574-6575 6584 6610 6637 6741 7208 7220 7227 7254 7267 7361 7420 7512-7513 7558 8230 8374 8787 8829 8843 8867 8870 8907 9005 9150 10272 10304 10441 10656 10803 10847 10918 10937 10953 10989 11004 11018 11059 11067 11100 11186 11614 11824 11853 11918 16044 16091 17741 17751 17773 17913 18008-18009 18029 18036 18063 18073 18104 18381 18524 18544 18782 18843 18865 19045 19283 19373 19376 19619 21873 21887 23193 23209 25596 25936 25955 25961 25977 26005 26079 26141 26184 26213 26247 26291 26446 26455 26486 26493 26602 26863 27049 27074 27117 27123 27224 27228 27259 27310 27366 27395-27396 27407 27414 27455 27458 27469 27481 27484 27509 27515 27521 27529 27608 27614 27619 27635 27654 27669 27706 27724 27774 27792 27851 27882 27893 27941 27962 28060 28075 28226 28234 28300-28301 28316-28317 28328 28350 28362 28375 28432 28447 28518 28593 28598 28611 28629 28639 28657 36602 36617 36779 404102.381800341673347e-19 2.821731604724377e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/483/4847?format=asciidefaultJ/MNRAS/483/4847/tablea1Finding list: Low redshift AGN/companion galaxy pairsTypeAGN type (3)src.classfloatzAGNAGN redshiftsrc.redshift;pos.heliocentricfloatzcompn? Redshift of the companionsrc.redshift;pos.heliocentricfloatnullableSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject identification by coordinate designation (1)meta.id;meta.maincharf_ID[*] Flag on ID (2)meta.codecharobjID? SDSS DR12 ObjID (Alam et al. 2015ApJS..219...12A, Cat. V/147)meta.idnullablerProjected distance from the AGN to the centre of the companionarcsecpos.angDistanceintl_thetaLimit flag on thetameta.code.error;pos.posAngcharthetaProjected angle subtended by the companion galaxy around the AGNdegpos.posAngcharFcont? Local continuum flux Fcont, as tabulated in SDSS DR71e-19W.m**-2.nm**-1phot.flux.density;em.optfloatnullable[OIII]EW? OIII {lambda}5007 line equivalent width0.1nmspect.line.eqWidthfloatnullableFion? Predicted ionizing flux from the AGN at the projected distance of the companion galaxy (4)phot.flux.density;em.optfloatnullableNotesNotesmeta.notecharSloanDisplay the SDSS data for this objectmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main