J/MNRAS/475/5179ivo://CDS.VizieR/J/MNRAS/475/5179doi:10.26093/cds/vizier.74755179CDSSkipper C.J.Browne I.W.A.2024-08-18T20:18:14Z2021-05-05T11:14:35ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiastrometryredshiftedPrompted by a recent claim by Barrows et al. that X-ray active galactic nuclei (AGNs) are often found significantly offset from the centres of their host galaxies, we have looked for examples of compact radio sources that are offset from the optical centroids of nearby (z<0.2) galaxies. We have selected a sample of 345 galaxies from the Sloan Digital Sky Survey (SDSS) galaxy catalogue, which have nearby compact radio sources listed in the Cosmic-Lens All Sky Survey (CLASS) catalogue. We find only three matches ~0.87 per cent of the sample) with offsets greater than 600 milliarcsec (mas), which is considerably fewer than we would have expected from the Barrows et al. X-ray survey. We fit our histogram of offsets with a Rayleigh distribution with {sigma}=60.5mas, but find that there is an excess of objects with separations greater than ~150mas. Assuming that this excess represents AGNs with real offsets, we place an upper limit of ~17 per cent on the fraction of offset AGNs in our radio-selected sample. We select 38 objects with offsets greater than 150mas, and find they have some diverse properties: Some are well known, such as Mrk 273 and Arp 220, some have dust lanes, which may have affected the optical astrometry, and a few are strong new candidates for offset AGNs.2018MNRAS.475.5179Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/475/5179CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/72 : CLASS survey of radio sources (Myers+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/475/5179https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/475/5179http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/475/5179https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/475/5179https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/475/5179http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/475/5179GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/475/5179/table1 (*The high-offset galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/475/5179/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/475/5179/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/475/5179/table1?GETtext/xml+votable180.050000true11.01942881.031376360.0055555555555555566/4160 4188 4246 4289 4318 4413 4442 4515 4521 4579 4630 4638 4642 4655 4668 4672 4705 4708 4731 4747 4754 4807 4822 4865 4898 4910 4978 4993 5005 5018 5023 5079 5114 5156 5180 5206 5229 5277 5368 5372 5407 5521 5528 5539 5552 5567 5569 5583 5616 5618 5642 5671 5676 5680 5703 5798 5800 5846 5855 5861 5889 5894 5918 5920 5930-5931 5958 5975 5980 6007 6010 6044-6045 6053 6058 6067 6093 6105 6107 6124 6127 6137 6212 6214 6255 6401 6436 6477 6489 6519 6526 6583 6611 6637 7192 7196 7261 7265-7266 7269 7301 7311 7361 7398 7411 7425 7458 7518 7552 7560 7567 8239 8288 8290 8299 8321 8326 8345 8348 8377 8391 8393 8414 8425 8447 8479 8484 8514 8521 8526 8552 8618 8658-8659 8673 8850 8908 8917 8921 8927 8969 9009 9029 9037 9049 9064 9078 9132 9145 9200 9217 9245 9264 9311 9327 9350 9357 9368 9387 9396 9437 9443 9450 9470 9481 9742 9764 9771 9773 9784 9855 9860 9892 9895 10020 10025 10027 10096 10120 10147 10182 10223 10281 10311 10343 10345 10364 10367 10387 10456 10463 10482 10491 10518-10519 10588 10638 10657 10682 10721 10727 10758 10835 10868 10941 10959 10987 10991 11001 11091 11100-11101 11139 11146 11153 11170 11191 11242 11254-11255 11266 11325 11335 11349 11398 11426 11429 11499 11591 11908 11931 11936 11942 12382 12481 12549 17751 18114 18177 18386 18411 18782 18857 19429 19699 19983 19996 21976 25970 26011 26051 26060 26095 26199 26219 26287 26290 26322 26375 26390 26407 26422 26449 26469 26487 26545 26547 26607 27051 27080 27095 27115 27324 27440 27446 27474 27482 27502 27534 27543 27599 27637 27641 27677 27686 27722 27775 27798 27818 27851 27886 27910 27960 28003 28016 28020 28040 28075 28124 28126 28158 28162 28198 28205 28226 28233 28268 28293-28294 28322 28352 28372 28409 28414 28430 28443 28461 28466-28467 28471 28517 28526 28534 28547-28548 28554 28566 28608 28617 28633 28643 28655 30039 31399 31423 31437 31471 31694 32458 324805.605654881757026e-24 5.605654881757026e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/475/5179?format=asciidefaultJ/MNRAS/475/5179/table1*The high-offset galaxiesSimbadNameSimbad column added by the CDSmeta.idcharnullableOSSYOSSY catalog IDmeta.idrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS catalog ID (SDSS JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000OSSY right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000OSSY declination (J2000)degpos.eq.dec;meta.mainzRedshift of galaxy from OSSY catalogsrc.redshiftdoubleONameOther common galaxy names (i.e. NGC, Messier, UGC, IC, Markarian catalog IDs)meta.idcharSy/LINER[SEYFERT LINER] Seyfert or LINER, based upon the line strengths from the OSSY catalogmeta.codecharCLASSCLASS catalog ID (GB6JHHMMSS+DDMMSS)meta.idcharRANdegRight ascension (J2000) of nearest CLASS source to galaxy positiondegpos.eq.raDENdegDeclination (J2000) of nearest CLASS source to galaxy positiondegpos.eq.decOffsetNOffset between galaxy position and nearest CLASS sourcemaspos;arith.diffdoubleFluxNFlux density at 8.46GHz of nearest CLASS sourcemJyphot.flux.density;em.radio.6-12GHzfloatRABdeg? Right ascension (J2000) of brightest CLASS source (1)degpos.eq.ranullableDEBdeg? Declination (J2000) of brightest CLASS source (1)degpos.eq.decnullableOffsetB? Offset between galaxy position and brightest CLASS source (1)maspos;arith.diffdoublenullableFluxB? Flux density at 8.46GHz of brightest CLASS source (1)mJyphot.flux.density;em.radio.6-12GHzfloatnullable