J/A+A/555/A23ivo://CDS.VizieR/J/A+A/555/A23doi:10.26093/cds/vizier.35550023CDSAdebahr B.Krause M.Klein U.Wezgowiec M.Domans D. J.DettmarR.-J.2014-02-20T14:08:33Z2013-07-29T09:34:58ZCDS support team

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

cds-question@unistra.frradio-galaxiesmagnetic-fieldsradio-continuum-emissionIn order to study the cosmic ray propagation and determine the magnetic field strength and dominant loss processes in the nearby prototypical starbursting galaxy M82, a multi-frequency analysis at four radio wavelengths is presented. Archival data from the Westerbork Synthesis Radio Telescope (WSRT) was reduced and a new calibration technique introduced to reach the high dynamic ranges needed for the complex source morphology. These data were combined with archival Very Large Array (VLA) data, yielding total power maps at {lambda}3cm, {lambda}6cm, {lambda}22cm, and {lambda}92cm. The data show a confinement of the emission at wavelengths of {lambda}3/{lambda}6cm to the core region and a largely extended halo reaching up to 4kpc away from the galaxy midplane at wavelengths of {lambda}22/{lambda}92cm up to a sensitivity limit of 90uJy and 1.8mJy respectively indicating different physical processes in the core and halo regions. The results are used to calculate the magnetic field strength to 98uG in the core region and to 24uG in the halo regions. From the observation of ionisation losses, the filling factor of the ionised medium could be estimated to 2%. This leads to a revised view of the magnetic field distribution in the core region and the propagation processes from the core into the halo regions.2013A&A...555A..23Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/555/A23CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/17 : The North 20cm Survey (White+ 1992)VIII/14 : 87GB Catalog of radio sources (Gregory et al., 1991)VIII/23 : 6C Survey of radio sources - IV. (Hales+ 1991)VIII/13 : A new catalog of 53522 4.85GHz sources (Becker+ 1991)VIII/56 : Compendium of Radio Measurements of Bright Galaxies (Haynes+ 1975)J/MNRAS/391/1384 : Deep MERLIN 5GHz radio sources in M82 (Fenech+, 2008)J/ApJ/554/803 : New VLA Sky Survey (NVSS) Cat of IRAS 2 Jy Galaxies (Yun+ 2001)J/A+AS/114/21 : Shapley-Ames Galaxies at 2.8cm (Niklas+, 1995)J/A+A/293/703 : Outflow in M82 halo (McKeith+, 1995)J/ApJ/252/102 : Radio sources in bright spiral galaxies. II. (Condon+, 1982)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/555/A23https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/555/A23http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/555/A23https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/555/A23https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/555/A23http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/555/A23GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/555/A23/fits (Summary of FITS maps)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/555/A23/fits?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/555/A23/fits?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/555/A23/fits?GETtext/xml+votable180.050000true148.9943969.679380.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/555/A236/7606https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/555/A23?format=asciiRadiodefaultJ/A+A/555/A23/fitsSummary of FITS mapsMapDownload the FITS filemeta.ref.urlcharrecnoRecord 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[0.396] Scale of the imagearcsec/pixinstr.scalefloatNx[5456/5458] Number of pixels along X-axispixmeta.numberintNy[5456/5458] Number of pixels along Y-axispixmeta.numberintlamWavelength of the observationcminstr.filter;em.wl.centralintnullableFileNameName of FITS file in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.notechar