J/A+A/675/A59ivo://CDS.VizieR/J/A+A/675/A59doi:10.26093/cds/vizier.36750059CDSMaccagni F.M.Ruffa I.Loni A.Prandoni I.Ragusa R.Kleiner D.,Serra P.Iodice E.Spavone M.2024-11-06T20:05:16Z2023-06-30T10:01:04ZCDS support team

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

cds-question@unistra.frradio-galaxiesradio-sourcesWe present Australia Compact Telescope Array (ATCA) 21-cm observations of the nearby low-excitation radio galaxy (LERG) NGC 3100. This is the brightest galaxy of a loose group and hosts a young (~2Myr) radio source. The ATCA observations reveal for the first time the presence of neutral hydrogen (HI) gas in absorption in the centre of this radio galaxy, and in emission in two low-mass galaxies of the group and in a diffuse dark cloud in the proximity of NGC 3100. The sensitivity to low-column density gas (N_HI_~10^19^cm^-2^) allows us to reveal asymmetries in the periphery of most the HI-detected galaxies, suggesting that tidal interactions may be on-going. The diffuse cloud does not show a stellar counterpart down to 27mag/arcsec^2^ and could be the remnant of these interactions. The analysis of the HI absorption complex in NGC 3100 indicates that the atomic phase of the hydrogen is distributed as its molecular phase (observed at arcsecond resolution through several carbon monoxide emission lines). We suggest that the interactions occurring within the group are causing turbulent cold gas clouds in the intra-group medium to be slowly accreted towards the centre of NGC 3100. This caused the recent formation of the cold circum-nuclear disk which is likely sustaining the young nuclear activity.2023A&A...675A..59Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/675/A59CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/675/A59https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/675/A59http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/675/A59https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/675/A59https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/675/A59http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/675/A59GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/675/A59/table2 (HI properties of the sources in the NGC 3100 group)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/675/A59/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/675/A59/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/675/A59/table2?GETtext/xml+votable180.050000true150.17-31.66452780.005555555555555556Cone search capability for table J/A+A/675/A59/list (Information of fits datacube)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/675/A59/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/675/A59/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/675/A59/list?GETtext/xml+votable180.050000true150.17-31.664530.0055555555555555566/38795 38817https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/675/A59?format=asciiRadiodefaultJ/A+A/675/A59/table2HI properties of the sources in the NGC 3100 grouprecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name of the HI detections in the NGC3100 groupmeta.id;meta.maincharRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVsysHI systemic velocitykm/sphys.veloc;pos.heliocentricintW50Line-width (FWHM) at 50% of the peakkm/sspect.line.widthfloatW80Line-width at 20% of the peakkm/sphys.angSizefloatFHIIntegrated HI flux of the sourceJy.km/sphot.flux.density;spect.linefloatn_FHI[*] Note on FHI (1)meta.notecharMHITotal HI mass of the source of lower value of mass intervalsolMassphys.massdoubleMHIup? Upper value of total HI mass of the sourcesolMassphys.mass;stat.maxdoublenullablen_MHI[*] Note on MHD (2)meta.notecharJ/A+A/675/A59/table3Optical properties of the HI detections in the NGC 3100 grouprecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintgmagVEGAS magnitude in the g filter (1)magphot.mag;em.opt.BfloatrmagVEGAS magnitude in the r filter (1)magphot.mag;em.opt.Rfloatg-rg-r colormagphot.color;em.opt.B;em.opt.RfloatMstargStellar mass inferred from g magnitude1e+10solMassphys.massfloatMstarrStellar mass inferred from r magnitude1e+10solMassphys.massfloatNameSource name of the HI detections in the NGC3100 groupmeta.id;meta.maincharJ/A+A/675/A59/listInformation of fits datacubeBVELO-HELUpper value of heliocentric velocity intervalm/sphys.veloc;pos.heliocentricdoubledVELO-HELHelicoentric velocity resolutionm/sspect.resolutionfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharrecnoRecord 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.numberintNzNumber of slicesmeta.numberintObs.dateObservation datestime.epoch;obsnullablebVELO-HELLower value of heliocentric velocity intervalm/sphys.veloc;pos.heliocentricdoubleTitleTitle of the FITS filemeta.title;meta.fitschar