For refcode 2011ApJ...730..119R: Retrieve 18 NED objects in this reference. Please click here for ADS abstract
NED Abstract
Copyright by American Astronomical Society.
Reproduced by permission
2011ApJ...730..119R
A 3% Solution: Determination of the Hubble Constant with the Hubble Space
Telescope and Wide Field Camera 3 [ Erratum: 2011ApJ...732..129R ]
Riess, Adam G.; Macri, Lucas; Casertano, Stefano; Lampeitl, Hubert;
Ferguson, Henry C.; Filippenko, Alexei V.; Jha, Saurabh W.; Li, Weidong;
Chornock, Ryan
Abstract. We use the Wide Field Camera 3 (WFC3) on the Hubble Space
Telescope (HST) to determine the Hubble constant from optical and infrared
observations of over 600 Cepheid variables in the host galaxies of eight
recent Type Ia supernovae (SNe Ia), providing the calibration for a
magnituderedshift relation based on 253 SNe Ia. Increased precision over
past measurements of the Hubble constant comes from five improvements: (1)
more than doubling the number of infrared observations of Cepheids in the
nearby SN hosts; (2) increasing the sample size of ideal SN Ia calibrators
from six to eight; (3) increasing by 20% the number of Cepheids with
infrared observations in the megamaser host NGC 4258 (4) reducing the
difference in the mean metallicity of the Cepheid comparison samples
between NGC 4258 and the SN hosts from {DELTA}log [O/H] = 0.08 to 0.05;
and (5) calibrating all optical Cepheid colors with a single camera, WFC3,
to remove crossinstrument zeropoint errors. The result is a reduction in
the uncertainty in H_0_ due to steps beyond the first rung of the distance
ladder from 3.5% to 2.3%. The measurement of H_0_ via the geometric
distance to NGC 4258 is 74.8 +/ 3.1 km s^1^ Mpc^1^, a 4.1% measurement
including systematic uncertainties. Better precision independent of the
distance to NGC 4258 comes from the use of two alternative Cepheid
absolute calibrations: (1) 13 Milky Way Cepheids with trigonometric
parallaxes measured with HST/fine guidance sensor and Hipparcos and (2) 92
Cepheids in the Large Magellanic Cloud for which multiple accurate and
precise eclipsing binary distances are available, yielding 74.4 +/ 2.5 km
s^1^ Mpc^1^, a 3.4% uncertainty including systematics. Our best estimate
uses all three calibrations but a larger uncertainty afforded from any
two: H_0_ = 73.8 +/ 2.4 km s^1^ Mpc^1^ including systematic errors,
corresponding to a 3.3% uncertainty. The improved measurement of H_0_,
when combined with the Wilkinson Microwave Anisotropy Probe (WMAP) 7 year
data, results in a tighter constraint on the equationofstate parameter
of dark energy of w = 1.08 +/ 0.10. It also rules out the bestfitting
gigaparsecscale void models, posited as an alternative to dark energy.
The combined H_0_ + WMAP results yield N_eff_ = 4.2 +/ 0.7 for the number
of relativistic particle species in the early universe, a lowsignificance
excess for the value expected from the three known neutrino flavors.
Key words: cosmological parameters, dark energy, distance scale, galaxies:
distances and redshifts, stars: variables: Cepheids, supernovae: general
===========================================================================
2012ApJ...752...76R
Erratum: "A 3% Solution: Determination of the Hubble Constant with the
Hubble Space Telescope and Wide Field Camera 3" (2011, ApJ, 730, 119)
Riess, Adam G.; Macri, Lucas; Casertano, Stefano; Lampeitl, Hubert;
Ferguson, Henry C.; Filippenko, Alexei V.; Jha, Saurabh W.; Li, Weidong;
Chornock, Ryan; Silverman, Jeffrey M.
Abstract. Not Available
===========================================================================
Retrieve 18 NED objects in this reference. Please click here for ADS abstract
