J/MNRAS/357/645ivo://CDS.VizieR/J/MNRAS/357/645doi:10.26093/cds/vizier.73570645CDSAlmoznino E.Brosch N.Shara M.Zurek D.2024-06-30T20:17:15Z2007-06-17T11:32:34ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsultraviolet-astronomyccd-photometryWe present a new analysis of the deepest pure-ultraviolet (UV) observations with the highest angular resolution ever performed. A set of 12 exposures with the Hubble Space Telescope (HST) WFPC2 and F160BW filter obtained in parallel observing mode, which cover ~12arcmin^2^ in the Large Magellanic Cloud (LMC), north of the bar and in the 'general field' region of the LMC, contain stars with far-UV monochromatic magnitudes as faint as 22mag. The 198 detected UV sources represent an accumulated exposure of 2x10^4^s and reveal stars as faint as m_UV_=~20mag. We combine these observations with deep UBVI charge-coupled device (CCD) imaging of the same region reaching as faint as V=~26mag, and reselect probable optical counterparts for the UV sources. After a two-stage search-and-analysis process, we detect robust counterparts for 129 stars. These are mostly upper main-sequence stars, from early B to early A spectral classes, with several F stars. We point out the lack of blue supergiants, which could have been easily detected in our survey. We measure a foreground extinction E(B-V)=~0.08mag by Galactic dust and a surface density of star formation rate twice the average Galactic value. These observations indicate that relatively recent star formation took place even off the bar of the LMC.2005MNRAS.357..645Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/357/645CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/117/206 : LMC far-ultraviolet imaging (Brosch+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/357/645https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/357/645http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/357/645https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/357/645https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/357/645http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/357/645GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/357/645/table2 (FUV (160nm) stars in the HST LMC field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/357/645/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/357/645/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/357/645/table2?GETtext/xml+votable180.050000true81.2607917-69.50344170.0055555555555555566/33097https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/357/645?format=asciiUVdefaultJ/MNRAS/357/645/table2FUV (160nm) stars in the HST LMC fielde_U-Brms uncertainty on U-Bmagstat.error;phot.color;em.opt.UfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BSM99]UV source number, from Brosch et al., 1999, Cat. <J/AJ/117/206>meta.id;meta.mainintm_[BSM99]Multiplicity (for source #37) (1)meta.code.multipcharnObsNumber of observationsmeta.numberintRAJ2000HST right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000HST declination (J2000.0)pos.eq.dec;meta.mainRACCorrected right ascension (J2000.0)pos.eq.raDECCorrected declination (J2000.0)pos.eq.decUVmagFar UV (F160BW, 160nm) magnitudemagphot.mag;em.UVfloate_UVmagrms uncertainty on UVmagmagstat.error;phot.mag;em.UVfloat[ABS2005]LMC optical counterpart numbermeta.id.crossintXposX positionpixpos.cartesian.xdoubleYposY positionpixpos.cartesian.y;instr.detfloatRAOCCD right ascension (J2000.0)pos.eq.ra;instr.detDEOCCD declination (J2000.0)pos.eq.dec;instr.detImagI magnitudemagphot.mag;em.opt.Ifloate_Imagrms uncertainty on Imagmagstat.error;phot.mag;em.opt.Ifloato_Imag[3] Number of observations in I bandmeta.numberintVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloato_Vmag[3] Number of observations in V bandmeta.numberintBmagB magnitudemagphot.mag;em.opt.Bfloate_Bmagrms uncertainty on Bmagmagstat.error;phot.mag;em.opt.Bfloato_Bmag[3] Number of observations in B bandmeta.numberintUmagU magnitudemagphot.mag;em.opt.Ufloate_Umagrms uncertainty on Umagmagstat.error;phot.mag;em.opt.Ufloato_Umag[3] Number of observations in U bandmeta.numberintV-IV-I colour indexmagphot.color;em.opt.V;em.opt.Ifloate_V-Irms uncertainty on V-Imagstat.error;phot.color;em.opt.VfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.Vfloate_B-Vrms uncertainty on B-Vmagstat.error;phot.color;em.opt.BfloatU-BU-B colour indexmagphot.color;em.opt.U;em.opt.BfloatU-VU-V colour indexmagphot.color;em.opt.U;em.opt.Vfloate_U-Vrms uncertainty on U-Vmagstat.error;phot.color;em.opt.UfloatDistDistance between UV and optical sourcearcsecpos.angDistancefloatUV-IUV-I colour indexmagphot.color;em.UV;em.optfloate_UV-Irms uncertainty on UV-Imagstat.errorfloatUV-UUV-U colour indexmagphot.color;em.UV;em.optfloate_UV-Urms uncertainty on UV-Umagstat.errorfloatUV-VUV-V colour indexmagphot.color;em.UV;em.optfloate_UV-Vrms uncertainty on UV-Vmagstat.errorfloat