The Hubble Constant
MEASUREMENTS OF THE HUBBLE CONSTANT
... the Hubble Constant with the Sunyaev-Zeldovich Effect 51 ...the Hubble constant. Recent observations and data have given a Hubble constant in the vicinity of H 0 = 60km s −1 M pc ...
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Carnegie Hubble Program: A Mid-Infrared Calibration of the Hubble Constant
... Key words: cosmological parameters – cosmology: observations – distance scale – galaxies: distances and redshifts – stars: variables: Cepheids 1. INTRODUCTION Over the past several decades, there has been a steady ...
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Calculation of the Universal Gravitational Constant, of the Hubble Constant, and of the Average CMB Temperature
... This constant is crucial in the subsequent calculations of several physics’ ...fine-structure constant α ...not constant through space and ...the Hubble constant H 0 as a function of ...
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Effects of Time Dilation on the Measurements of the Hubble Constant
... the Hubble constant by starting the evalua- tion from the time of the big bang era, the effect of time dilation results in a decrease in the value of the Hubble ...the Hubble constant ...
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A Possible Solution to the Disagreement about the Hubble Constant
... Although the above absence of correlations supports the model, as well as the proposed resolution of the disagreement over the Hubble constant, neither fully confirms it. On the other hand, the following ...
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A 2.4% DETERMINATION of the LOCAL VALUE of the HUBBLE CONSTANT
... the Hubble Space Telescope ( HST ) to reduce the uncertainty in the local value of the Hubble constant from ...The Hubble constant from each is ...
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A Gravitational-Wave Standard Siren Measurement of the Hubble Constant
... THE HUBBLE VELOCITY OF NGC 4993 In previous EM determinations of the cosmic “distance ladder”, the Hubble flow velocity of the local calibrating galaxies has generally been estimated using ...
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A gravitational-wave standard siren measurement of the Hubble constant
... the Hubble constant that combines the distance to the source inferred purely from the gravitational-wave signal with the recession velocity inferred from measurements of the redshift using the ...
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A gravitational wave standard siren measurement of the Hubble constant
... Valenti et al. 2017; Arcavi et al. 2017; Tanvir et al. 2017; Lipunov et al. 2017). These multi-messenger observations allow us to use GW170817 as a standard siren (Schutz 1986; Holz & Hughes 2005; Dalal et al. 2006; ...
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A New Model of the Gravitational Lens 0957+561 and a Limit on the Hubble Constant
... & Squires (1993). Rhee et al. (1995) are currently applying the method to the field around 0957+561 and results are awaited. What is the future for lens-based measurements of the Hubble constant? We believe ...
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Measuring the Hubble constant from reverberating accretion discs in active galaxies
... 0.25 25 13830 11090 0.86 403.7 1.34 Note: For all fits the number of degrees of freedom is 302. a decrease in the tem peratures, T b and Tp. Table 4.1, adopts a simplified approach, and details the ‘best-fit’ four param ...
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Measuring the Value of the Hubble Constant “à la Refsdal”
... the Hubble constant that are complementary to and potentially competitive with those of other cosmological ...to Hubble Space Telescope (HST ) deep imaging and Multi Unit Spectroscopic Explorer ...
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A Standard Siren Measurement of the Hubble Constant from GW170817 without the Electromagnetic Counterpart
... We perform a statistical standard siren analysis of GW170817. Our analysis does not utilize knowledge of NGC 4993 as the unique host galaxy of the optical counterpart to GW170817. Instead, we consider each galaxy within ...
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A Standard Siren Measurement of the Hubble Constant from GW170817 without the Electromagnetic Counterpart
... We perform a statistical standard siren analysis of GW170817. Our analysis does not utilize knowledge of NGC 4993 as the unique host galaxy of the optical counterpart to GW170817. Instead, we consider each galaxy within ...
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Clarifying the Hubble constant tension with a Bayesian hierarchical model of the local distance ladder
... 9 CONCLUSIONS We have used Bayesian inference to assess the apparent dis- crepancy between the value of the Hubble constant obtained from local distance ladder measurements and that implied by the Planck ...
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Gravitationally lensed quasars: light curves, observational constraints, modeling and the Hubble constant.
... John N. Bahcall (1934 - 2005) Abstract The central topic of this thesis is gravitational lensing, a phenomenon that occurs when light rays from a background source pass near a massive object located on the line of sight ...
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Determining the Hubble constant from gravitational wave observations of merging compact binaries
... 5. IMPLICATIONS FOR COSMOLOGY Assuming GR accurately describes the inspiral dynam- ics and GW emission, GW standard sirens should pro- vide a measure of H 0 based on absolutely-calibrated GW distances that are ...
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Investigating the prospects for constraining the Hubble constant using compact binary coalescences as standard sirens
... the Hubble constant with the binary neutron star merger GW170817, and in anticipation of future detections during upcoming observing runs, it is useful to further investigate standard sirens, the ...
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Precise measurements of time delays in gravitationally lensed quasars for competitive and independent determination of the Hubble constant
... the Hubble constant, when CMB observations are able to deliver such stringent joint constraints on the whole cosmological parameters ? The answer resides in the question ...
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Toward a New Geometric Distance To the Active Galaxy NGC 4258. III. Final Results and The Hubble Constant
... the Hubble constant remains important because it does not share the systematic uncertainties of the other methods, ...derived Hubble constant and the distance ladder assumptions associated ...
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