J/A+A/627/A6ivo://CDS.VizieR/J/A+A/627/A6doi:10.26093/cds/vizier.36270006CDSSalome Q.Salome P.Gusdorf A.Combes F.2019-07-09T14:06:45Z2019-07-01T10:15:18ZCDS support team

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

cds-question@unistra.frradio-galaxiesradio-astronomyNGC 5128 (Centaurus A) is one of the best targets to study AGN-feedback in the local Universe. Optical filaments located at 16 kpc from the galaxy along the radio jet direction show recent star formation, likely triggered by the interaction of the jet with an HI shell. A large reservoir of molecular gas has been discovered outside the HI. In this reservoir, lies the Horseshoe complex: a filamentary structure seen in CO with ALMA and in Halpha with MUSE. The ionised gas is mostly excited by shocks, with only a minor contribution of star formation. We used the Atacama Pathfinder EXperiment (APEX) to observe the ^12^CO(3-2) and ^12^CO(4-3) transitions, as well as dense gas tracers in the Horseshoe complex. ^12^CO(3-2) and ^12^CO(4-3) are detected for the first time in the northern filaments of Centaurus A, with integrated intensity line ratios R32~0.2 and R43~0.1, compared to the ^12^CO(1-0) emission. We also derived a line ratio R21~0.6, based on the previous ^12^CO(2-1) observations of Salome et al. (2016, Cat. J/A+A/595/A65). We used the non-LTE radiative transfer code RADEX and determined that the molecular gas in this region has a temperature of 55-70K and densities between 2-6x10^2^cm^-3^. Such densities are also in agreement with results from the Paris-Durham shock code that predicts a post-shock density of a few 100cm^-3^. However, we need more observations of emission lines at a better angular resolution in order to place tighter constraints on our radiative models, whether they are used as a stand-alone tool (LVG codes) or combined with a shock model.2019A&A...627A...6Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/627/A6CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/595/A65 : APEX spectra of Centaurus A (Salome+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/627/A6https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/627/A6http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/627/A6https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/627/A6https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/627/A6http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/627/A6GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/627/A6/list (List of fits spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/627/A6/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/627/A6/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/627/A6/list?GETtext/xml+votable180.050000true201.61438-42.814230.0055555555555555566/43263https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/627/A6?format=asciiRadiodefaultJ/A+A/627/A6/listList of fits spectrarecnoRecord 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.numberintObs.dateObservation datestime.epoch;obsnullablebFreqLower value of relative frequencyHzem.freq;stat.mindoubleBFreqUpper value of relative frequencyHzem.freq;stat.maxdoubledFreqFrequency resolutionHzspect.resolutiondoublesizeSize of FITS fileKibytephys.size;meta.fitsintspShow the spectrummeta.ref.urlcharFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar