J/ApJ/732/65ivo://CDS.VizieR/J/ApJ/732/65doi:10.26093/cds/vizier.17320065CDSWeyant A.Wood-Vasey M.Wasserman L.Freeman P.2018-01-04T08:22:19Z2012-12-04T15:05:00ZCDS support team

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

cds-question@unistra.frsupernovaeredshiftedastronomical-modelsWe apply statistically rigorous methods of nonparametric risk estimation to the problem of inferring the local peculiar velocity field from nearby Type Ia supernovae (SNIa). We use two nonparametric methods -weighted least squares (WLS) and coefficient unbiased (CU)- both of which employ spherical harmonics to model the field and use the estimated risk to determine at which multipole to truncate the series. We show that if the data are not drawn from a uniform distribution or if there is power beyond the maximum multipole in the regression, a bias is introduced on the coefficients using WLS. CU estimates the coefficients without this bias by including the sampling density making the coefficients more accurate but not necessarily modeling the velocity field more accurately. After applying nonparametric risk estimation to SNIa data, we find that there are not enough data at this time to measure power beyond the dipole. The WLS Local Group bulk flow is moving at 538+/-86km/s toward (l,b)=(258+/-10{deg},36+/-11{deg}) and the CU bulk flow is moving at 446+/-101km/s toward (l,b)=(273+/-11{deg},46+/-8{deg}). We find that the magnitude and direction of these measurements are in agreement with each other and previous results in the literature.2011ApJ...732...65Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/732/65CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)J/ApJS/192/1 : Light-curve parameters from the SNLS (Conley+, 2011)J/MNRAS/412/1441 : SNe luminosity functions (Li+, 2011)J/MNRAS/412/1419 : Nearby supernova rates (Leaman+, 2011)J/MNRAS/410/1262 : SN Legacy Survey. Type Ia supernovae (Walker+, 2011)J/A+A/523/A7 : Light curves of type Ia supernovae in SNLS (Guy+, 2010)J/AJ/139/120 : Low-redshift Type-Ia supernovae (Folatelli+, 2010)J/ApJS/190/418 : Light curves for 165 SNe (Ganeshalingam+, 2010)J/ApJ/700/1097 : Light curve parameters of SN Ia (Hicken+, 2009)J/ApJ/700/331 : Light curves of type Ia supernovae (CfA3) (Hicken+, 2009)J/A+A/507/85 : ESO/VLT 3rd year type Ia supernova data (Balland+, 2009)J/ApJ/666/674 : ESSENCE supernova survey (Miknaitis+, 2007)J/ApJ/659/122 : Improved distances to type Ia supernovae (Jha+, 2007)http://snfactory.lbl.gov/ : Nearby SN Factory home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/732/65https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/732/65http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/732/65https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/732/65https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/732/65http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/732/65GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/732/65/table1 (SNIa data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/732/65/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/732/65/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/732/65/table1?GETtext/xml+votable180.050000true201.402125-43.03172220.0055555555555555566/34 626 1677 1700 1701 1796 2227 2232 2347 2391 2641 3398 3415 4401 4447 4583 4719 4993 5639 5975 6178 6877 6936 6962 7044 7166 7198 7241 7659 7747 7923 8064 9698 10203 10789 10817 10858 11158 11496 11824 14009 14733 14834 15548 15954 15955 16690 17278 18061 18206 18296 18324 18394 18895 19084 19227 19241 19554 19958 20014 20090 20237 20279 21300 22826 23013 23294 23405 24131 24920 25078 25333 25513 25615 25769 25889 25963 26268 26336 27348 27367 27426 27491 27512 27568 27728 27773 27918 27945 28035 28075 28089 28249 28299 28353 28356 28453 28498 30044 31218 31230 31628 32129 32340 32561 32569 34361 34540 35629 35844 36131 36287 40379 43262 43713 43828 43855 44000 44007 44026 44915 45983 46882 47170 48625https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/732/65?format=asciiOpticaldefaultJ/ApJ/732/65/table1SNIa datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSNSN name (YYYYaa) (1)meta.id;meta.maincharRAJ2000Hour of right ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000) (2)pos.eq.dec;meta.mainz[0.003/0.028] Redshift in the rest frame of the cosmic microwave backgroundsrc.redshiftfloate_z[0.001] z uncertaintystat.error;src.redshiftfloatmu[28.012/35.282] Distance modulus ({mu})magphot.mag.distModfloate_mumu uncertaintymagstat.errorfloatAv[0.006/3.134] Extinctionmagphys.absorptionfloate_AvAv uncertaintymagstat.errorfloatUVel[-942/2423]? Peculiar velocity (U) (3)km/sphys.velocintnullablee_UVel[322/741]? UVel uncertainty (4)km/sstat.errorintnullableSNcatCross-match with Hicken+ and Jha catalogs (within 3")meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.refchar