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segunda-feira, abril 11, 2016

A 2.4% Determination of the Local Value of the Hubble Constant

Adam G. Riess, Lucas M. Macri, Samantha L. Hoffmann, Dan Scolnic, Stefano Casertano, Alexei V. Filippenko, Brad E. Tucker, Mark J. Reid, David O. Jones, Jeffrey M. Silverman, Ryan Chornock, Peter Challis, Wenlong Yuan, Ryan J. Foley

(Submitted on 5 Apr 2016)

We use the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) to reduce the uncertainty in the local value of the Hubble constant (H_0) from 3.3% to 2.4%. Improvements come from observations of Cepheid variables in 10 new hosts of recent SNe~Ia, more than doubling the sample of SNe~Ia having a Cepheid-calibrated distance for a total of 18; these leverage the magnitude-redshift relation based on 300 SNe~Ia at z<0 .15.="" 0.06="" 1.9="" 15="" 18="" 2.4="" 2="" 3.0="" 33="" 3="" 67.3="" 69.3="" 71.93="" 72.39="" 73.03="" 74.45="" 76.09="" 8="" a="" additional="" all="" an="" anchors="" and="" anticipate="" at="" best="" between="" but="" by="" calibrations="" cepheids.="" cepheids:="" cepheids="" cmb="" combination="" combines="" conflict="" consider="" could="" cross-instrument="" dark="" data="" debs="" delta="" distance="" each="" early="" errors.="" errors="" estimate="" ev="" explanation="" face="" final="" font="" for="" four="" from="" geometric="" h_0="" higher="" hosts="" hst-based="" hst="" i="" if="" ii="" iii="" improvements="" in="" include="" includes="" involve="" is="" iv="" km="" lambdacdm="" late-type="" lmc="" m31.="" m31="" maser="" mass="" may="" measurements.="" measurements="" megamaser="" megamasers="" milky="" more="" mw="" n_eff="0.4-1." neutrinos="" new="" ngc4258="" nullifying="" observations="" observed="" of="" one="" other="" our="" parallax="" parallaxes="" pc="" planck="" plausible="" play="" predicted="" prediction="" radiation="" range="" reduces="" reduction="" relative="" respectively.="" robust="" role="" sec="" sigma="" significant="" source="" suggesting="" system="" systematic="" take="" tension.="" than="" the="" this="" thus="" to="" trigonometric="" uncertainties="" uncertainty="" universe="" upcoming="" value="" way="" we="" were="" wfc3="" with="" wmap="" zeropoint="">

Comments: submitted to ApJ, 63 pages, 16 figures, 8 tables

Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Astrophysics of Galaxies (astro-ph.GA)

Cite as: arXiv:1604.01424 [astro-ph.CO]

(or arXiv:1604.01424v1 [astro-ph.CO] for this version)

Submission history

From: Adam G. Riess [view email

[v1] Tue, 5 Apr 2016 21:00:26 GMT (1475kb)