J/A+A/522/A3ivo://CDS.VizieR/J/A+A/522/A3doi:10.26093/cds/vizier.35220003CDSGratier P.Braine J.Rodriguez-Fernandez N.J.Schuster K.F.Kramer C.,Xilouris E.M.Tabatabaei F.S.Henkel C.Corbelli E.Israel F.,van der Werf P.P.Calzetti D.Garcia-Burillo S.Sievers A.Combes F.,Wiklind T.Brouillet N.Herpin F.Bontemps S.Aalto S.Koribalski B.,van der Tak F.Wiedner M.C.Rollig M.Mookerjea B.2017-06-12T08:24:52Z2010-10-27T07:46:47ZCDS support team

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

cds-question@unistra.frgalaxiesh-i-line-emissionco-line-emissionWe present high-resolution large-scale observations of the molecular and atomic gas in the Local Group galaxy M 33. The observations were carried out using the HEterodyne Receiver Array (HERA) at the 30m IRAM telescope in the CO(2-1) line, achieving a resolution of 12"x2.6km/s, enabling individual giant molecular clouds (GMCs) to be resolved. The observed region is 650 square arcminutes mainly along the major axis and out to a radius of 8.5kpc, and covers entirely the 2'x40' radial strip observed with the HIFI and PACS Spectrometers as part of the HERM33ES Herschel key program. The achieved sensitivity in main-beam temperature is 20-50mK at 2.6km/s velocity resolution. The CO(2-1) luminosity of the observed region is 1.7+/-0.1x10^7^K.km/s.pc^2^ and is estimated to be 2.8+/-0.3x10^7^K.km/s.pc^2^ for the entire galaxy, corresponding to H_2_ masses of 1.9x10^8^ and 3.3x10^8^ respectively (including He), calculated with N(H_2_)/I_CO_(1-0) twice the Galactic value due to the half-solar metallicity of M 33. The HI 21cm VLA archive observations were reduced, and the mosaic was imaged and cleaned using the multi-scale task in the CASA software package, yielding a series of datacube with resolutions ranging from 5" to 25". The HI mass within a radius of 8.5kpc is estimated to be 1.4x10^9^. The azimuthally averaged CO surface brightness decreases exponentially with a scale length of 1.9+/-0.1kpc whereas the atomicgas surface density is constant at {Sigma}_HI_=6+/-2pc^-2^ deprojected to face-on. For an (H_2_)/I_CO_(1-0) conversion factor twice that of the Milky Way, the central kiloparsec H2 surface density is {Sigma}_HI_=8.5+/-0.2pc^-2^. The star formation rate per unit moecular gas (SF efficiency, the rate of transformation of molecular gas into stars), as traced by the ratio of CO to H{alpha} and FIR brightness, is constant with radus. The SFE, with a N(H2)/I_CO_(1-0) factor twice galactic, appears 2-4 times greater than for large spiral galaxies. A morphological comparison of molecular and atomic gas with tracers of star formation is presented showing good agreement between these maps both in terms of peaks and holes. A few exceptions are noted. Several spectra, including those of a molecular cloud situated more than 8kpc from the galaxy center, are presented.2010A&A...522A...3Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/522/A3CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/522/A3https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/522/A3http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/522/A3https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/522/A3https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/522/A3http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/522/A3GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/522/A3/list (Summary of files)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/522/A3/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/522/A3/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/522/A3/list?GETtext/xml+votable180.050000true23.4804730.716670.0055555555555555566/2155https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/522/A3?format=asciiRadiodefaultJ/A+A/522/A3/listSummary of filesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Center of image (J2000)degpos.eq.ra;meta.mainDEJ2000Center of image (J2000)degpos.eq.dec;meta.mainscaleScale of imagearcsec/pixinstr.scalefloatXsizeSize of image along X axispixphys.angSizeintYsizeSize of image along Y axispixphys.angSizeintFileNameName of FITS filemeta.id;meta.fitschar