J/MNRAS/466/4540ivo://CDS.VizieR/J/MNRAS/466/4540doi:10.26093/cds/vizier.74664540CDSHagen L.M.Z.Siegel M.H.Hoversten E.A.Gronwall C.Immler S.Hagen A.2024-08-17T20:18:01Z2019-12-06T15:03:16ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsgalaxiesphotometryextinctionWe present the first results from the Swift Ultraviolet Survey of the Magellanic Clouds, the highest resolution ultraviolet (UV) survey of the Magellanic Clouds yet completed. In this paper, we focus on the Small Magellanic Cloud (SMC). When combined with multiwavelength optical and infrared observations, the three near-UV filters on the Swift Ultraviolet/Optical Telescope are conducive to measuring the shape of the dust extinction curve and the strength of the 2175{AA} dust bump. We divide the SMC into UV-detected star-forming regions and large 200-arcsec (58pc) pixels and then model the spectral energy distributions using a Markov-chain Monte Carlo method to constrain the ages, masses, and dust curve properties. We find that the majority of the SMC has a 2175{AA} dust bump, which is larger to the north-east and smaller to the south-west, and that the extinction curve is predominantly steeper than the Galactic curve. We also derive a star formation history and find evidence for peaks in the star formation rate at 6-10, 30-80, and 400Myr, the latter two of which are consistent with previous work.2017MNRAS.466.4540Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/466/4540CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/466/4540https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/466/4540http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/466/4540https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/466/4540https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/466/4540http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/466/4540GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap1.5062136169708525e-19 1.7003137259100215e-19defaultJ/MNRAS/466/4540/table3Photometry of SMC star-forming regionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegion[1/338] Region numbermeta.id;obs.fieldintW2magSwift/UVOT uvw2 magnitude (AB)magphot.mag;em.UVfloate_W2magSwift/UVOT uvw2 magnitude uncertainty (1)magstat.error;phot.magfloatM2magSwift/UVOT uvm2 magnitude (AB)magphot.mag;em.UVfloate_M2magSwift/UVOT uvm2 magnitude uncertainty (1)magstat.error;phot.mag;em.IR.4-8umfloatW1magSwift/UVOT uvw1 magnitude (AB)magphot.mag;em.IR.3-4umfloate_W1magSwift/UVOT uvw1 magnitude uncertainty (1)magstat.error;phot.magfloatBmagHarris B magnitude (AB)magphot.mag;em.opt.Bfloate_BmagHarris B magnitude uncertainty (1)magstat.error;phot.mag;em.opt.BfloatVmagHarris V magnitude (AB)magphot.mag;em.opt.Vfloate_Vmag? Harris V magnitude uncertainty (1)magstat.error;phot.mag;em.opt.VfloatnullableRmagHarris R magnitude (AB)magphot.mag;em.opt.Rfloate_RmagHarris R magnitude uncertainty (1)magstat.error;phot.mag;em.opt.RfloatJmag2MASS J magnitude (AB)magphot.mag;em.IR.Jfloate_Jmag2MASS J magnitude uncertainty (1)magstat.error;phot.mag;em.IR.Jfloat3.6magIRAC 3.6 micron magnitude (AB)magphot.mag;em.IR.3-4umfloate_3.6mag? IRAC 3.6 micron magnitude uncertainty (1)magstat.errorfloatnullableJ/MNRAS/466/4540/table4Photometry of SMC large pixelsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPixel[1/775] Pixel numbermeta.idintW2magSwift/UVOT uvw2 magnitude (AB)magphot.mag;em.UVfloate_W2magSwift/UVOT uvw2 magnitude uncertainty (1)magstat.error;phot.magfloatM2magSwift/UVOT uvm2 magnitude (AB)magphot.mag;em.UVfloate_M2magSwift/UVOT uvm2 magnitude uncertainty (1)magstat.error;phot.mag;em.IR.4-8umfloatW1magSwift/UVOT uvw1 magnitude (AB)magphot.mag;em.IR.3-4umfloate_W1magSwift/UVOT uvw1 magnitude uncertainty (1)magstat.error;phot.magfloatBmagHarris B magnitude (AB)magphot.mag;em.opt.Bfloate_BmagHarris B magnitude uncertainty (1)magstat.error;phot.mag;em.opt.BfloatVmag? Harris V magnitude (AB)magphot.mag;em.opt.Vfloatnullablee_Vmag? Harris V magnitude uncertainty (1)magstat.error;phot.mag;em.opt.VfloatnullableRmagHarris R magnitude (AB)magphot.mag;em.opt.Rfloate_RmagHarris R magnitude uncertainty (1)magstat.error;phot.mag;em.opt.Rfloat3.6magIRAC 3.6 micron magnitude (AB)magphot.mag;em.IR.3-4umfloate_3.6magIRAC 3.6 micron magnitude uncertainty (1)magstat.errorfloat8.0magIRAC 8.0 micron magnitude (AB)magphot.flux.density;em.IR.8-15umfloate_8.0magIRAC 8.0 micron magnitude uncertainty (1)magstat.errorfloatJ/MNRAS/466/4540/table5Physical properties of SMC star-forming regionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegion[1/338] Region numbermeta.id;obs.fieldintRadRadiuspcphys.size.radiusfloatAVBest-fit total extinction in V band, A_Vmagphys.absorption;em.opt.VfloatE_AVUpper uncertainty on A_Vmagstat.error;stat.maxfloate_AVLower uncertainty on A_Vmagstat.errorfloatRVBest-fit ratio of selective to total extinction, R_Vphys.absorptionfloatE_RVUpper uncertainty on R_Vstat.error;stat.maxfloate_RVLower uncertainty on R_Vstat.errorfloatBumpBest-fit 2175A bump strengthphys.absorptionfloatE_BumpUpper uncertainty on Bumpstat.error;stat.maxfloate_BumpLower uncertainty on Bumpstat.errorfloatlogAgeBest-fit log10 of the agelog(Myr)time.age;meta.modelledfloatE_logAgeUpper uncertainty on log.agelog(Myr)stat.error;stat.maxfloate_logAgeLower uncertainty on log.agelog(Myr)stat.error;time.agefloatlogMassBest-fit log10 of the mass (1)log(solMass)phys.massfloatE_logMassUpper uncertainty on log.masslog(solMass)stat.error;stat.maxfloate_logMassLower uncertainty on log.masslog(solMass)stat.error;phys.massfloatlogMstelBest-fit log10 of the stellar masslog(solMass)phys.massfloatE_logMstelUpper uncertainty on log.stellog(solMass)stat.error;stat.maxfloate_logMstelLower uncertainty on log.stellog(solMass)stat.errorfloatJ/MNRAS/466/4540/table6Physical properties of SMC large pixelsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPixel[1/775] Pixel numbermeta.idintAV? Best-fit total extinction in V band,magphys.absorption;meta.modelledfloatnullableE_AV? Upper uncertainty on A_Vmagstat.error;stat.maxfloatnullablee_AV? Lower uncertainty on A_Vmagstat.errorfloatnullableRV? Best-fit ratio of selective to total extinction, R_Vphys.absorptionfloatnullableE_RV? Upper uncertainty on R_Vstat.error;stat.maxfloatnullablee_RV? Lower uncertainty on R_Vstat.errorfloatnullableBump? Best-fit 2175A bump strengthphys.absorptionfloatnullableE_Bump? Upper uncertainty on bumpstat.error;stat.maxfloatnullablee_Bump? Lower uncertainty on bumpstat.errorfloatnullablelogAge? Best-fit log10 of the agelog(Myr)time.age;meta.modelledfloatnullableE_logAge? Upper uncertainty on log.agelog(Myr)stat.error;stat.maxfloatnullablee_logAge? Lower uncertainty on log.agelog(Myr)stat.error;time.agefloatnullabletau? Best-fit for the age, SFH time-scale tauMyrtime.ageintnullableE_tau? Upper uncertainty on tauMyrstat.error;stat.maxintnullablee_tau? Lower uncertainty on tauMyrstat.errorintnullablelogMass? Best-fit log10 of the mass (1)log(solMass)phys.massfloatnullableE_logMass? Upper uncertainty on log.masslog(solMass)stat.error;stat.maxfloatnullablee_logMass? Lower uncertainty on log.masslog(solMass)stat.error;phys.massfloatnullablelogMstel? Best-fit log10 of the stellar masslog(solMass)phys.massfloatnullableE_logMstel? Upper uncertainty on log.stellog(solMass)stat.error;stat.maxfloatnullablee_logMstel? Lower uncertainty on log.stellog(solMass)stat.errorfloatnullable