J/ApJ/654/240ivo://CDS.VizieR/J/ApJ/654/240doi:10.26093/cds/vizier.16540240CDSRosolowsky E.2009-02-07T17:03:23Z2009-02-07T17:58:55ZCDS support team

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

cds-question@unistra.frgalaxiesmolecular-cloudsradio-astronomyWe present Berkeley-Illinois-Maryland Association (BIMA) millimeter interferometer observations of giant molecular clouds (GMCs) along a spiral arm in M31. The observations consist of a survey using the compact configuration of the interferometer and follow-up, higher resolution observations on a subset of the detections in the survey. The data are processed using an analysis algorithm designed to extract GMCs and correct their derived properties for observational biases, thereby facilitating comparison with Milky Way data. The algorithm identifies 67 GMCs, of which 19 have a sufficient signal-to-noise ratio to accurately measure their properties. The GMCs in this portion of M31 are indistinguishable from those found in the Milky Way, having a similar size-line width relationship and distribution of virial parameters, confirming the results of previous, smaller studies. The velocity gradients and angular momenta of the GMCs are comparable to the values measured in M33 and the Milky Way, and in all cases are below expected values based on the local galactic shear. The studied region of M31 has an interstellar radiation field, metallicity, Toomre Q parameter, and midplane volume density similar to those of the inner Milky Way, so the similarity of GMC populations between the two systems is not surprising.2007ApJ...654..240Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/654/240CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/654/240https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/654/240http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/654/240https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/654/240https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/654/240http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/654/240GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/654/240/table2 (Molecular Cloud Properties in M31)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/654/240/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/654/240/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/654/240/table2?GETtext/xml+votable180.050000true10.804219741.61521170.0055555555555555566/2623 2666 2709https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/654/240?format=asciiRadiodefaultJ/ApJ/654/240/table2Molecular Cloud Properties in M31oDERelative position along DE (1)arcsecpos.eq.dec;arith.diffintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintType[HL] (H)igh or (L)ow S/N Clouds (5)meta.codechar[R2007]Sequential numbermeta.recordintoRARelative position along RA (1)arcsecpos.eq.ra;arith.diffintMlumLuminous mass (2)10000solMassphys.massintRe? Deconvolved radius (2) (3)pcphys.size.radiusintnullablesigmavLine width (2)km/sspect.line.widthfloatTmax/sigmaMaximum temperature to line width rms ratiostat.stdev;spect.line.width;stat.maxfloat|{nabla}v|Velocity gradient magnitude (2)km.s**-1.pc**-1arith.grad;phys.velocfloatu_|{nabla}v|[d] Uncertainty flag on |{nabla}v| (4)meta.notechar{nabla}PAGradient position angle (2)degarith.grad;pos.posAngint_RAComputed Right Ascension for Equinox: J2000degpos.eq.ra;meta.main_DEComputed Declination for Equinox: J2000degpos.eq.dec;meta.main