J/A+A/588/A146ivo://CDS.VizieR/J/A+A/588/A146doi:10.26093/cds/vizier.35880146CDSSchulz R.Kreikenbohm A.Kadler M.Ojha R.Ros E.Stevens J.,Edwards P. G.Carpenter B.Elsasser D.Gehrels N.Grossberger C.,Hase H.Horiuchi S.Lovell J. E. J.Mannheim K.Markowitz A.,Muller C.Phillips C.Plotz C.Quick J.Trustedt J.Tzioumis A. K.,Wilms J.2017-07-06T06:26:40Z2016-04-01T10:21:30ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiradio-galaxiesvery-long-baseline-interferometryGamma-ray-detected radio-loud narrow-line Seyfert 1 (g-NLS1) galaxies constitute a small but interesting sample of the g-ray-loud AGN. The radio-loudest g-NLS1 known, PKS 2004-447, is located in the southern hemisphere and is monitored in the radio regime by the multiwavelength monitoring programme TANAMI. We aim for the first detailed study of the radio morphology and long-term radio spectral evolution of PKS 2004-447, which are essential for understanding the diversity of the radio properties of g-NLS1s. The TANAMI VLBI monitoring program uses the Australian Long Baseline Array (LBA) and telescopes in Antarctica, Chile, New Zealand, and South Africa to monitor the jets of radio-loud active galaxies in the southern hemisphere. Lower resolution radio flux density measurements at multiple radio frequencies over four years of observations were obtained with the Australia Telescope Compact Array (ATCA). The TANAMI VLBI image at 8.4GHz shows an extended one-sided jet with a dominant compact VLBI core. Its brightness temperature is consistent with equipartition, but it is an order of magnitude below other g-NLS1s with the sample value varying over two orders of magnitude. We find a compact morphology with a projected large-scale size <11kpc and a persistent steep radio spectrum with moderate flux-density variability. PKS 2004-447 appears to be a unique member of the g-NLS1 sample. It exhibits blazar-like features, such as a flat featureless X-ray spectrum and a core-dominated, one-sided parsec-scale jet with indications for relativistic beaming. However, the data also reveal properties atypical for blazars, such as a radio spectrum and large-scale size consistent with compact-steep-spectrum (CSS) objects, which are usually associated with young radio sources. These characteristics are unique among all g-NLS1s and extremely rare among g-ray-loud AGN.2016A&A...588A.146Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/588/A146CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/588/A146https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/588/A146http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/588/A146https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/588/A146https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/588/A146http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/588/A146GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/588/A146/list (List of FITS images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/588/A146/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/588/A146/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/588/A146/list?GETtext/xml+votable180.050000true301.97995-44.578630.0055555555555555566/47419https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/588/A146?format=asciiRadiodefaultJ/A+A/588/A146/listList of FITS imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainScaleScale of the imagemas/pixinstr.scaledoubleNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintFreqFrequencyGHzem.freqfloatObs.DateObservation datetime.epoch;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the filemeta.title;meta.filecharJ/A+A/588/A146/table1Flux density measurements of ATCArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqFrequencyGHzem.freqfloatObs.DateObservation datetime.epoch;obsnullableFluxFlux densityJyphot.fluxfloate_FluxUncertainty of Flux densityJystat.error;phot.fluxfloatJDJulian datedtime.epochdouble