J/A+A/658/A188ivo://CDS.VizieR/J/A+A/658/A188doi:10.26093/cds/vizier.36580188CDSSantoro F.Kreckel K.Belfiore F.Groves B.Congiu E.Thilker D.A.,Blanc G.A.Schinnerer E.Ho I-T.Kruijssen J.M.D.Meidt S.,Klessen R.S.Schruba A.Querejeta M.Pessa I.Chevance M.Kim J.,Emsellem E.McElroy R.Barnes A.T.Bigiel F.Boquien M.Dale D.A.,Glover S.C.O.Grasha K.Lee J.Leroy A.K.Pan H.-A.Rosolowsky E.,Saito T.Sanchez-Blazquez P.Watkins E.J.Williams T.G.2022-08-25T11:46:51Z2022-03-02T07:04:07ZCDS support team

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

cds-question@unistra.frgalaxiesh-ii-regionsvisible-astronomyh-alpha-photometryh-beta-photometryWe use an unprecedented sample of about 23000 HII regions detected at an average physical resolution of 67pc in the PHANGS-MUSE sample to study the extragalactic HII region H{alpha} luminosity function (LF). Our observations probe the star-forming disk of 19 nearby spiral galaxies with low inclination and located close to the star formation main sequence at z=0. The mean LF slope in our sample is =1.73 with a {sigma} of 0.15. We find that {alpha} decreases with the galaxy's star formation rate surface density {SIGMA}_SFR_ and argue that this is driven by an enhanced clustering of young stars at high gas surface densities. Looking at the HII regions within single galaxies we find that no significant variations occur between the LF of the inner and outer part of the star-forming disk, whereas the LF in the spiral arm areas is shallower than in the inter-arm areas for six out of the 13 galaxies with clearly visible spiral arms. We attribute these variations to the spiral arms increasing the molecular clouds arm-inter-arm mass contrast and find suggestive evidence that they are more evident for galaxies with stronger spiral arms. Furthermore, we find systematic variations in {alpha} between samples of HII regions with high and low ionization parameter q and argue that they are driven by the aging of HII regions.2022A&A...658A.188Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/658/A188CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/658/A188https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/658/A188http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/658/A188https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/658/A188https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/658/A188http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/658/A188GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/658/A188/table1 (Main properties of the galaxies in the PHANGS-MUSE sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/658/A188/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/658/A188/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/658/A188/table1?GETtext/xml+votable180.050000true353.61453-36.101080.005555555555555556Cone search capability for table J/A+A/658/A188/catalog (PHANGS-MUSE HII regions catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/658/A188/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/658/A188/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/658/A188/catalog?GETtext/xml+votable180.050000true353.59936194-36.083693890.0055555555555555566/17747 17753 18398 24912 26303 27514 27728 27861 28033 28035 28167 33920-33921 33958 34343 34382 34404 34531 36134 36261 40328 46481 46549https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/658/A188?format=asciiOpticaldefaultJ/A+A/658/A188/table1Main properties of the galaxies in the PHANGS-MUSE samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalaxyGalaxy namemeta.id.parentcharRAJ2000Right ascension of the galaxy center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of the galaxy center (J2000)degpos.eq.dec;meta.mainMorphHubble Morphological type (1)src.morph.typecharDistDistance (2)Mpcpos.distancefloatiInclination angle (3)degsrc.orbital.inclination;pos.posAngfloatPAPosition angle (3)degpos.posAngfloatlogM*Total stellar masslog(solMass)phys.massfloatSFRTotal star formation rate (4)solMass/yrphys.SFRfloatDSFMSOffset fro the star formation main sequencemeta.id;meta.mainfloatSimbadSimbad column added by the CDSmeta.ref.urlcharR25B-band isophotal radius (1)arcsecphys.angSizeintFWHM-PSFAngular resolution of the cop data (5)arcsecpos.angResolutionfloatScaleScaling factorpc/arcsecarith.factorfloatrmaxmaximum deprojected galactocentric radius in units of R25phys.size.radius;stat.maxfloatJ/A+A/658/A188/catalogPHANGS-MUSE HII regions catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalaxyName of the galaxy hosting the HII regionmeta.id.parentcharRegionUnique ID for the HII regionmeta.id;meta.mainintRAJ2000Right ascension of the geometrical centre of the HII region (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination of the geometrical centre of the HII region (J2000)degpos.eq.dec;meta.mainindexeddeprojDistDeprojected distance from galaxy centrearcsecpos.distancefloatFHa6562Integrated Flux of the Halpha 6562{AA} emission line (in 10^-20^erg/cm^2^/s)1e-23W.m**-2phot.flux;spect.lineinte_FHa6562Error of FHa6562 (in 10^-20^erg/cm^2^/s)1e-23W.m**-2stat.errorintFHb4861Integrated Flux of the Hbeta 4861{AA} emission line (in 10^-20^erg/cm^2^/s)1e-23W.m**-2phot.flux;em.line.Hbetainte_FHb4861Error of FHb4861 (in 10^-20^erg/cm^2^/s)1e-23W.m**-2stat.errorintFHa6562corrIntegrated Flux of the Halpha 6562{AA} emission line corrected for dust extinction (in 10^-20^erg/cm^2^/s)1e-23W.m**-2phot.flux;spect.linelonge_FHa6562corrError of FHa6562corr (in 10^-20^erg/cm^2^/s)1e-23W.m**-2stat.errorintlogqD91? Logarithm of the Ionization parameter q (Diaz et al., 1991MNRAS.253..245D)phys.ionizParam.radfloatnullablee_logqD91[]? Error of logqD91stat.errorfloatnullableEnv[1/3] Flag for galactic environment (1)meta.codeint