J/MNRAS/436/1286ivo://CDS.VizieR/J/MNRAS/436/1286doi:10.26093/cds/vizier.74361286CDSMcKinley B.Briggs F.Gaensler B.M.Feain I.J.Bernardi G.Wayth R.B.,Johnston-Hollitt M.Offringa A.R.Arcus W.Barnes D.G.Bowman J.D.,Bunton J.D.Cappallo R.J.Corey B.E.Deshpande A.A.Desouza L.,Emrich D.Goeke R.Greenhill L.J.Hazelton B.J.Herne D.Hewitt J.N.,Kaplan D.L.Kasper J.C.Kincaid B.B.Koenig R.Kratzenberg E.,Lonsdale C.J.Lynch M.J.Mcwhirter S.R.Mitchell D.A.Morales M.F.,Morgan E.Oberoi D.Ord S.M.Pathikulangara J.Prabu T.,Remillard R.A.Rogers A.E.E.Roshi D.A.Salah J.E.Sault R.J.,Udaya Shankar N.Srivani K.S.Stevens J.Subrahmanyan R.Tingay S.J.,Waterson M.Webster R.L.Whitney A.R.Williams A.Williams C.L.,Wyithe J.S.B.2024-08-06T20:17:29Z2022-02-07T15:35:30ZCDS support team

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

cds-question@unistra.frradio-galaxiesWe present new wide-field observations of Centaurus A (Cen A) and the surrounding region at 118MHz with the Murchison Widefield Array (MWA) 32-tile prototype, with which we investigate the spectral-index distribution of Cen A's giant radio lobes. We compare our images to 1.4GHz maps of Cen A and compute spectral indices using temperature-temperature plots and spectral tomography. We find that the morphologies at 118MHz and 1.4GHz match very closely apart from an extra peak in the southern lobe at 118MHz, which provides tentative evidence for the existence of a southern counterpart to the northern middle lobe of Cen A. Our spatially averaged spectral indices for both the northern and southern lobes are consistent with previous analyses, however we find significant spatial variation of the spectra across the extent of each lobe. Both the spectral-index distribution and the morphology at low radio frequencies support a scenario of multiple outbursts of activity from the central engine. Our results are consistent with inverse-Compton modelling of radio and gamma-ray data that support a value for the lobe age of between 10 and 80Myr.2013MNRAS.436.1286Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/436/1286CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/other/NatAs/6.109 : Centaurus A (NGC 5128) 185MHz MWA image (McKinley+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/436/1286https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/436/1286http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/436/1286https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/436/1286https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/436/1286http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/436/1286GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/436/1286/list (Information on fits image)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/436/1286/list?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/436/1286/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/436/1286/list?GETtext/xml+votable180.050000true201.34417-43.039930.0055555555555555566/43262https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/436/1286?format=asciiRadiodefaultJ/MNRAS/436/1286/listInformation on fits imagerecnoRecord 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.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullableFreqObserved frequencyMHzem.freqfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar