J/ApJ/915/L3ivo://CDS.VizieR/J/ApJ/915/L3doi:10.26093/cds/vizier.19159003CDSKrieger N.Walter F.Bolatto A.D.Guillard P.Lehnert M.Leroy A.K.,Pety J.Emig K.L.Levy R.C.Krips M.Rix H.-W.Salak D.Weiss A.,Veilleux S.2025-07-18T20:13:02Z2024-02-13T07:57:11ZCDS support team

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

cds-question@unistra.frgalaxiesmolecular-cloudsco-line-emissionmolecular-physicsWe present a 154 pointing IRAM NOEMA mosaic of the CO(1-0) line emission in and around the nearby starburst galaxy M82. The observations, complemented by zero-spacing observations, reach a spatial resolution of ~30 pc (~1.9") at 5.0km/s spectral resolution, sufficient to resolve the molecular gas in the central starburst disk, the outflow, and the tidal streamers. The resulting moment and peak brightness maps show a striking amount of structure. Using a clump decomposition algorithm, we analyze the physical properties (e.g., radii R, line widths {sigma}, and masses M) of ~2000 molecular clouds. To first order, the clouds' properties are very similar, irrespective of their environment. This also holds for the size-line width relations of the clouds. The distribution of clouds in the {sigma}^2^/R versus column density {Sigma} space suggests that external pressure does not play a significant role in setting their physical parameters in the outflow and streamers. We find that the clouds in the streamers stay approximately constant in size (R~50pc) and mass (M~10^5^M_{sun}_) and do not vary with their projected distance from M82's center. The clouds in the outflow, on the other hand, appear to decrease in size and mass with distance toward the southern outflow. The reduction in the molecular gas luminosity could be indicative of cloud evaporation of embedded clouds in the hot outflow.2021ApJ...915L...3Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/915/L3CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/293/703 : Outflow in M82 halo (McKeith+, 1995)J/ApJ/686/948 : CO in extragalactic giant molecular clouds (Bolatto+, 2008)J/ApJ/899/158 : Gas structure comparison; NGC253 and Milky Way (Krieger+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/915/L3https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/915/L3http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/915/L3https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/915/L3https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/915/L3http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/915/L3GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/915/L3/table2 (Cloud catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/915/L3/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/915/L3/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/915/L3/table2?GETtext/xml+votable180.050000true148.955369.67870.0055555555555555566/7606https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/915/L3?format=asciiRadiodefaultJ/ApJ/915/L3/table2Cloud catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/1891] Cloud index numbermeta.id;meta.mainintRAJ2000[148.8/149.2] Cloud center right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[69.6/69.8] Cloud center declination (J2000)degpos.eq.dec;meta.mainVel[-185.4/460.5] Cloud center velocitykm/sphys.velocfloatRcenter[0.039/4.1] Projected cloud distance (1)kpcpos.distancefloatRad[5.4/180]? Projected cloud radius; see Section 4.2.1pcphys.size.radiusfloatnullablesigma[1.3/36]? Cloud line width; see Section 4.2.2km/sspect.line.widthfloatnullableMass[359/5.1e+7] Cloud mass (2)solMassphys.massdoubleSigma[1/570]? Cloud surface density (2)solMass.pc**-2phot.flux.density.sbfloatnullablemu[0.017/11] Cloud surface brightnessK.km.pc**-2phot.mag.sbfloatRegionRegion the cloud belongs to; see Section 3.2 ("disk", "outflow_north", "outflow_south", "streamer_east" or "streamer_west")obs.fieldchar