J/A+A/672/A55ivo://CDS.VizieR/J/A+A/672/A55doi:10.26093/cds/vizier.36720055CDSVeronese S.de Blok W.J.G.Walter F.2023-10-16T11:57:53Z2023-04-04T07:51:49ZCDS support team

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

cds-question@unistra.frradio-galaxiesh-i-line-emissiongalaxiesWe present new neutral hydrogen (HI) observations of the nearby galaxy NGC 2403 to determine the nature of a low-column density cloud that was detected earlier by the Green Bank Telescope. We find that this cloud is the tip of a complex of filaments of extraplanar gas that is coincident with the thin disk. The total HH mass of the complex is 2x10^7^ solar masses or 0.6% of the total HI mass of the galaxy. The main structure, previously referred to as the 8-kpc filament, is now seen to be even more extended, along a 20kpc stream. The kinematics and morphological properties of the filaments are unlikely to be the result of outflows related to galactic fountains. It is more likely that the 20kpc filament is related to a recent galaxy interaction. In this context, a ~50kpc long stellar stream has been recently detected connecting NGC 2403 with the nearby dwarf satellite DDO 44. Intriguingly, the southern tip of this stream overlaps with that of 20kpc HI filament. We conclude that the HI anomalies in NGC 2403 are the result of a recent (~2Gyr) interaction with DDO 44 leading to the observed filamentary complex.2023A&A...672A..55Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/672/A55CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/672/A55https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/672/A55http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/672/A55https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/672/A55https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/672/A55http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/672/A55GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/672/A55/list (List of fits datacubes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/672/A55/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/672/A55/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/672/A55/list?GETtext/xml+votable180.050000true114.1820865.591810.0055555555555555566/7743https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/672/A55?format=asciiRadiodefaultJ/A+A/672/A55/listList of fits datacubesrecnoRecord 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 pixels along Z-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablebVOPTLower value of Vopt intervalm/sphys.velocintBVOPTUpper value of Vopt intervalm/sphys.velocintdVOPTVopt resolutionm/sspect.resolutionfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar