Results 1 to 10 of about 114,518 (203)
Living Reviews in Relativity, 2015 I review the current state of determinations of the Hubble constant, which gives the length scale of the Universe by relating the expansion velocity of objects to their distance. There are two broad categories of measurements.
Neal Jackson
doaj +12 more sources
Living Reviews in Relativity, 2007 I review the current state of determinations of the Hubble constant, which gives the length scale of the Universe by relating the expansion velocity of objects to their distance.
Jackson Neal
doaj +10 more sources
Annual Review of Astronomy and Astrophysics, 2010 Considerable progress has been made in determining the Hubble constant over the past two decades. We discuss the cosmological context and importance of an accurate measurement of the Hubble constant, and focus on six high-precision distance-determination
Barry F. Madore +7 more
core +4 more sources
Measuring the Hubble Constant with the Hubble Space Telescope [PDF]
Proceedings of the International Astronomical Union, 2009 Ten years ago our team completed the Hubble Space Telescope Key Project on the extragalactic distance scale. Cepheids were detected in some 25 galaxies and used to calibrate four secondary distance indicators that reach out into the expansion field ...
J. R. Mould +6 more
core +3 more sources
Is the Hubble Constant Scale-dependent? [PDF]
Gravitation and Cosmology, 2017 An exact determination of the Hubble constant remains one of key problems in cosmology for almost a century. However, its modern values derived by various methods still disagree from each other by almost 10%; the greater values being obtained by ...
Dumin, Yurii V.
core +2 more sources
Measuring the Hubble constant with a sample of kilonovae [PDF]
Nature Communications, 2020 Kilonovae observations can be used to out constraints on the Hubble constant (H0). Here, the authors show H0 measurements by combining light curves of four short gamma-ray burts with GW170817 are about a factor of 2-3 more precise than the standard-siren
Michael W. Coughlin +9 more
doaj +2 more sources
Median statistics and the Hubble constant [PDF]
Publications of the Astronomical Society of the Pacific, 2011 Following Gott et al. (2001), we use Huchra's final compilation of 553 measurements of the Hubble constant ($H_0$) to determine median statistical constraints on $H_0$.
Chen, Gang, Ratra, Bharat
core +2 more sources
Cepheid Parallaxes and the Hubble Constant [PDF]
Monthly Notices of the Royal Astronomical Society, 2007 Revised Hipparcos parallaxes for classical Cepheids are analysed together with 10 HST-based parallaxes (Benedict et al.). In a reddening-free V,I relation we find that the coefficient of logP is the same within the uncertainties in our Galaxy as in the ...
Feast, Michael W. +3 more
core +2 more sources
Determination of the Hubble constant. [PDF]
Proc Natl Acad Sci U S A, 1999 Establishing accurate extragalactic distances has provided an immense challenge to astronomers since the 1920s. The situation has improved dramatically as better detectors have become available, and as several new, promising techniques have been developed. For the first time in the history of this difficult field, relative distances to
Freedman WL, Feng LL.
europepmc +4 more sources
Maximum Entropy Estimates of Hubble Constant from Planck Measurements [PDF]
EntropyA maximum entropy (ME) methodology was used to infer the Hubble constant from the temperature anisotropies in cosmic microwave background (CMB) measurements, as measured by the Planck satellite.
David P. Knobles, Mark F. Westling
doaj +2 more sources