J/MNRAS/479/4041ivo://CDS.VizieR/J/MNRAS/479/4041doi:10.26093/cds/vizier.74794041CDSSu H.Macquart J.P.Hurley-Walker N.McClure-Griffiths N.M.,Jackson C.A.Tingay S.J.Tian W.W.Gaensler B.M.McKinley B.,Kapinska A.D.Hindson L.Hancock P.Wayth R.B.Staveley-Smith L.,Morgan J.Johnston-Hollitt M.Lenc E.Bell M.E.Callingham J.R.,Dwarkanath K.S.For B.-Q.Offringa A.R.Procopio P.Wu C.Zheng Q.2024-08-18T20:20:43Z2022-05-06T09:16:12ZCDS support team

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

cds-question@unistra.frh-ii-regionsradio-continuum-emissionWe derive the synchrotron distribution in the Milky Way disc from HII region absorption observations over -40{deg}<l<40{deg} at six frequencies of 76.2, 83.8, 91.5, 99.2, 106.9, and 114.6MHz with the GaLactic and Extragalactic All-sky Murchison Widefield array survey (GLEAM). We develop a new method of emissivity calculation by taking advantage of the Haslam et al. (1981A&A...100..209H) map and known spectral indices, which enable us to simultaneously derive the emissivity and the optical depth of HII regions at each frequency. We show our derived synchrotron emissivities based on 152 absorption features of HII regions using both the method previously adopted in the literature and our improved method. We derive the synchrotron emissivity from HII regions to the Galactic edge along the line of sight and, for the first time, derive the emissivity from HII regions to the Sun. These results provide direct information on the distribution of the Galactic magnetic field and cosmic ray electrons for future modelling.2018MNRAS.479.4041Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/479/4041CatalogResearchIsServedByTAP VizieR generic servicerelated-toVIII/100 : GaLactic and Extragalactic All-sky MWA survey (Hurley-Walker+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/479/4041https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/479/4041http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/479/4041https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/479/4041https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/479/4041http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/479/4041GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/MNRAS/479/4041/tablea1The derived synchrotron emissivities and optical depths of HII regions at 76.2MHzSimbadNameSimbad column added by the CDSmeta.idcharnullablee_DistDistance errorkpcstat.errorfloatl_tauLimit flag on taumeta.code.errorcharTtTotal brightness temperature from the Sun to the Galactic edge in the absence of HII region absorption derived from the Haslam map1000Kphys.temperaturefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTeElectron temperature1000Kphys.temperature.electron;phys.electronfloate_TeElectron temperature error1000Kstat.errorfloatThMeasured brightness temperature in the direction of the absorbed region1000Kphys.temperaturefloate_ThTh error1000Kstat.errorfloate_TtTt error1000Kstat.errorfloatTmMeasured brightness temperature from the Sun to the Galactic edge in the absence of HII region emission from the GLEAM map1000Kphys.temperaturefloate_TmTm error1000Kstat.errorfloatTbDerived brightness temperature of the synchrotron emission from HII regions to the Galactic edge1000Kphys.temperaturefloatE_TbTb error (upper value)1000Kstat.error;stat.maxfloate_TbTb error (lower value)1000Kstat.errorfloatTfDerived brightness temperature of the synchrotron emission from the HII region to the Sun1000Kspect.line.intensity;obs.fieldfloatE_TfTf error (upper value)1000Kstat.error;stat.maxfloate_TfTf error (lower value)1000Kstat.errorfloatXbBrightness temperature of the emission on the missing short interferometric spacings between the Galactic edge and the Sun (1)1000Kphys.temperaturefloatE_XbXb error (upper value)1000Kstat.error;stat.maxfloate_XbXb error (lower value)1000Kstat.errorfloatXfBrightness temperature of the emission on the missing short interferometric spacings between an HII region and the Sun (1)1000Kphys.temperaturefloatE_XfXf error (upper value)1000Kstat.error;stat.maxfloate_XfXf error (lower value)1000Kstat.errorfloattauOptical depth of the HII regionphys.absorption.opticalDepth;obs.fieldfloatembAverage emissivity between the HII region and the Galactic edgeK/pcphys.emissivityfloatE_embemb error (upper value)K/pcstat.error;stat.maxfloate_embemb error (lower value)K/pcstat.errorfloatDistDistance from HII region to the sunkpcpos.distancefloatemfAverage emissivity between the HII region and the SunK/pcphys.emissivityfloatE_emfemf error (upper value)K/pcstat.error;stat.maxfloate_emfemf error (lower value)K/pcstat.errorfloatembsimEmissivity between the HII region and the Galactic edge derived from the simplified methodK/pcphys.emissivityfloate_embsimembsim errorK/pcstat.errorfloatHIIHII Region name (GLLL.lll+BB.bbb)meta.id;obs.fieldchar