J/ApJ/699/539ivo://CDS.VizieR/J/ApJ/699/539doi:10.26093/cds/vizier.16990539CDSRiess A.G.Macri L.Casertano S.Sosey M.Lampeitl H.Ferguson H.C.,Filippenko A.V.Jha S.W.Li W.Chornock R.Sarkar D.2017-12-05T05:10:46Z2011-07-20T08:38:43ZCDS support team

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

cds-question@unistra.frvariable-starshst-photometrysupernovaeThis is the second of two papers reporting results from a program to determine the Hubble constant to ~5% precision from a refurbished distance ladder based on extensive use of differential measurements. Here we report observations of 240 Cepheid variables obtained with the Near-Infrared Camera and Multi-Object Spectrometer (NICMOS) Camera 2 through the F160W filter on the Hubble Space Telescope (HST). The Cepheids are distributed across six recent hosts of Type Ia supernovae (SNe Ia) and the "maser galaxy" NGC 4258, allowing us to directly calibrate the peak luminosities of the SNe Ia from the precise, geometric distance measurements provided by the masers. New features of our measurement include the use of the same instrument for all Cepheid measurements across the distance ladder and homogeneity of the Cepheid periods and metallicities, thus necessitating only a differential measurement of Cepheid fluxes and reducing the largest systematic uncertainties in the determination of the fiducial SN Ia luminosity. In addition, the NICMOS measurements reduce the effects of differential extinction in the host galaxies by a factor of ~5 over past optical data. Combined with a greatly expanded set of 240 SNe Ia at z<0.1 which define their magnitude-redshift relation, we find H_0_=74.2+/-3.6km/s/Mpc, a 4.8% uncertainty including both statistical and systematic errors.2009ApJ...699..539Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/699/539CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/183/109 : Cepheids in 3 host galaxies (Riess+, 2009)J/ApJ/652/1133 : BVI photometry of NGC 4258 Cepheids (Macri+, 2006)J/ApJ/627/579 : Photometry of variables in NGC 3370 (Riess+, 2005)J/ApJ/529/723 : VI photometry of Cepheids (Gibson+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/699/539https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/699/539http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/699/539https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/699/539https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/699/539http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/699/539GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/699/539/table3 (NIC2 F160W Cepheid observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/699/539/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/699/539/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/699/539/table3?GETtext/xml+votable180.050000true50.51457917-15.401178330.005555555555555556Cone search capability for table J/ApJ/699/539/table4 (NICMOS Cepheids)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/699/539/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/699/539/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/699/539/table4?GETtext/xml+votable180.050000true188.577472.193860.0055555555555555566/5639 5975 10977 10979 10982 26271 27918 28299 362871.1079043399350366e-19 1.3907732428889734e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/699/539?format=asciiOpticaldefaultJ/ApJ/699/539/table3NIC2 F160W Cepheid observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTargetTarget designation (1)meta.id;obscharn_Target[a] Duplicated field (2)meta.notecharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainExpTExposure timestime.duration;obs.exposurefloatFieldField designation as in table 4 (added by CDS)obs.fieldcharprimaryJ/ApJ/699/539/table4NICMOS CepheidsPerPerioddtime.periodfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldCepheid's NIC2 field designationobs.fieldcharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.main[RML2009]Identification number (1)meta.id;meta.mainintV-IMean (V-I) color indexmagphot.color;em.opt.V;em.opt.Ifloatr_V-I[lm/psl] Source of the optical detection (5)meta.ref;phot.color;em.opt.VcharF160WHST/NICMOS NIR F160W band magnitudemagphot.mag;em.IR.Hfloate_F160WF160W uncertaintymagstat.errorfloatOffsetSeparation between NICMOS and optical position (2)pixpos.angDistancefloatBiasPhotometric bias (3)magstat.errorfloatPhaseCorrection from the sampled phase to the mean (already substracted to determine F160W)maginstr.paramfloat[O/H]Metallicity parameter, 12+log[O/H] inferred at the position of each Cepheidphys.abundfloatFlag[<P/rej, ] Rejection flag employed (4)meta.code.errorcharPapIData from Paper I (Riess et al., 2009, Cat. J/ApJS/183/109)meta.ref.urlcharMSB06NGC 4258 data from Macri et al., 2006, Cat. J/ApJ/652/1133meta.ref.urlcharSimbadNameSimbad column added by the CDSmeta.idchar