J/ApJ/709/424ivo://CDS.VizieR/J/ApJ/709/424doi:10.26093/cds/vizier.17090424CDSMurray N.Rahman M.2017-12-12T14:45:14Z2012-03-29T10:28:49ZCDS support team

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

cds-question@unistra.frh-ii-regionsmilky-way-galaxyinterstellar-mediuminfrared-sourcesradio-sourcesWe use the Wilkinson Microwave Anisotropy Probe (WMAP) maximum entropy method foreground emission map combined with previously determined distances to giant HII regions to measure the free-free flux at Earth and the free-free luminosity of the Galaxy. We find a total flux f_{nu}_=54211Jy and a flux from 88 sources of f_{nu}_=36043Jy. The bulk of the sources are at least marginally resolved, with mean radii ~60pc, electron density n_e_~9cm^-3^, and filling factor {Phi}HII~0.005 (over the Galactic gas disk). We use GLIMPSE and Midcourse Space Experiment (MSX) 8um images to show that the bulk of the free-free luminosity is associated with bubbles having radii r~5-100pc, with a mean of ~20pc. These bubbles are leaky, so that ionizing photons emitted inside the bubble escape and excite free-free emission beyond the bubble walls, producing WMAP sources that are larger than the 8um bubbles. We suggest that the WMAP sources are the counterparts of the extended low density HII regions described by Mezger (1978A&A....70..565M). The 18 most luminous WMAP sources emit half the total Galactic ionizing flux.2010ApJ...709..424Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/709/424CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)V/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003)J/A+A/537/A1 : Infrared fluxes of HII regions and PNe (Anderson+, 2012)J/ApJS/180/283 : WMAP five-year source catalog (Wright+, 2009)J/ApJ/691/1560 : Dense core survey in the Orion B cloud (Ikeda+, 2009)J/ApJ/670/428 : Bubbles in the galactic disk. II. (Churchwell+, 2007)J/ApJ/649/759 : Bubbles in the galactic disk (Churchwell+, 2006)J/A+A/397/133 : Star-forming complexes in the Galaxy (Russeil+, 2003)J/AJ/126/1423 : MSX 8.3um fluxes of star-forming regions (Kraemer+, 2003)J/A+AS/25/25 : HII regions of the Northern Milky Way (Dubout-Crillon+ 1976)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/709/424https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/709/424http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/709/424https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/709/424https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/709/424http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/709/424GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/709/424/table2 (Identified H II regions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/709/424/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/709/424/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/709/424/table2?GETtext/xml+votable180.050000true249.7568-10.76490.0055555555555555566/1287 1544 1559 1781 3011 3301 3649 3681 3755 14002 14063 14255 14263 14311 14358 14403 14411 14622 14624 14627 14689 14693 14719 15368 15412 15456 15478 15640 15670 15683 21439 21645 22208 22249 22854 23636 23717 23982 23993 24185 24554 28809 28830 28913 29091 29115 29463 29508 29513 30218 30262 30319 30341 30420 30607 30694 30717 30818 37365 37753 37840 37872 37900 37923 38016 39174 39190 39249 39386 39804 39910 41655 41683 41767 41780 41815 42172 42215 42379 42391 42398 42438 42456 42460 42948 42982 43019https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/709/424?format=asciiInfraredRadiodefaultJ/ApJ/709/424/table2Identified H II regionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLONGalactic Longitudedegpos.galactic.lonGLATGalactic Latitudedegpos.galactic.lataSemi-major Axisdegphys.angSize.smajAxisfloatbSemi-minor Axisdegphys.angSize.sminAxisfloatFluxIntegrated Free-Free FluxJyphot.flux.density;em.radiointDistDistance to Sourcekpcpos.distance;pos.heliocentricfloat[R2003][1,480]? Source number from Russeil (2003, Cat. J/A+A/397/133)meta.idintnullabler_Dist? Other reference for Dist (1)meta.ref;pos.frameintnullableLumFree-Free Luminosity; in erg/s/Hz1e-07W.Hz**-1phys.luminositydoubleReg? Associated Regionmeta.id.assoccharSimbadSimbad column added by the CDSmeta.refchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ra;meta.mainnullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.dec;meta.mainnullableindexed