J/A+A/712/A89ivo://CDS.VizieR/J/A+A/712/A89CDSJimenez-Lopez D.Garcia-Burillo S.Querejeta M.Usero A.Tarrio P.2026-08-06T17:04:13Z2026-08-06T18:03:48ZCDS support team

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

cds-question@unistra.frradio-galaxiesgalaxiesco-line-emissionHalos surrounding spiral galaxies act as the bridges connecting the galactic dis k and the intergalactic medium (IGM). They host a significant fraction of the baryonic mass in the Universe, and feedback from star formation (SF) or active galactic nuclei (AGN) likely plays an important role in regulating this vertical baryonic component. Despite its importance, the contribution of extraplanar molecular gas remains poorly understood. We aim to characterize the vertical extent and the kinematics of molecular gas traced by CO(2-1) emission in the nearby (D=9.5Mpc) spiral galaxy NGC891, one of the best studied edge-on galaxies. We also compare our results with the extr aplanar distribution of other tracers of baryonic matter, including atomic gas (HI), diffuse ionized gas (H{alpha}-traced DIG), and dust maps from the literature. Our analysis is based on new CO(2-1) observations of NGC 891 obtained with the IRAM 30m telescope. We mapped two 6kpcx6kpc regions on the northeastern side and the area surrounding the galactic center. We apply a careful method to estimate and remove the residual contribution of the error beam to the CO cube. The vertical extent of the molecular gas is best described by a two-component Gaussian fit, consisting of a bright thin disk component (deconvolved FWHM<=360pc; upper limit) and a fainter thick disk component (deconvolved FWHM=~1.1kpc). Statistically significant (>3{sigma}) CO(2-1) emission is detected up to 1.3-1.4kpc above the disk midplane. We estimate that the thick molecular disk component contains up to ~27% of the total molecular gas mass of the galaxy. The vertical extent of H{alpha} emission is similar to that of the molecular gas, whereas HI extends much further. Our results demonstrate that SF-driven feedback in a non-starburst galaxy can lift significant amounts of molecular gas to large vertical distances. We interpret the presence of extraplanar molecular gas in NGC 891 in the framework of a galactic fountain scenario, in which material is expelled from star-forming regions and transported toward the outer halo. This is supported by optical images where dust columns rise from the inner disk, showing spatial correlation between CO(2-1), H{alpha}, and dust.2026A&A...712A..89Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/712/A89CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/565/A4 : NGC 891 70-500um images (Hughes+, 2014)J/A+A/575/A17 : NGC 891 Herschel PACS and SPIRE spectroscopy (Hughes+, 2015)J/A+A/615/A98 : NGC 891 LOFAR and AMI maps (Mulcahy+, 2018)J/A+A/632/A12 : NGC 891 and NGC 4565 radio images (Schmidt+, 2019)J/ApJ/832/118 : Emission-line spectroscopy in NGC 891 (Boettcher+, 2016)J/ApJ/853/114 : Vertical population gradients in NGC 891. I.J/ApJ/895/71 : 8um Cores in NGC 891, NGC 3628 & IC 5052 (Elmegreen+, 2020)J/MNRAS/396/1231 : Astrophotometric catalogue of NGC 891 (Rejkuba+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/712/A89https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/712/A89http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/712/A89https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/712/A89https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/712/A89http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/712/A89GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/712/A89/list (List of fits images and datacube)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/712/A89/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/712/A89/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/712/A89/list?GETtext/xml+votable180.050000true35.6241542.346640.0055555555555555566/2409https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/712/A89?format=asciiRadiodefaultJ/A+A/712/A89/listList of fits images and datacuberecnoRecord 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.mainscale? Scale of the image, for the datacubearcsec/pixinstr.scaleintnullableNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintNz? Number of slices, for the datacubemeta.numberintnullablebVRAD? Lower value of VRAD interval, for the datcubem/sphys.veloc;pos.heliocentricdoublenullableBVRAD? Upper value of VRAD interval, for the datcubem/sphys.veloc;pos.heliocentricdoublenullabledVRAD? VRAD resolutionm/sspect.resolutionfloatnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar