Results 61 to 70 of about 295,900 (371)

The 2dF Galaxy Redshift Survey: power-spectrum analysis of the final data set and cosmological implications [PDF]

open access: yes, 2005
We present a power-spectrum analysis of the final 2dF Galaxy Redshift Survey (2dFGRS), employing a direct Fourier method. The sample used comprises 221 414 galaxies with measured redshifts.
S. Cole   +31 more
semanticscholar   +1 more source

Evolution of the AGN UV luminosity function from redshift 7.5 [PDF]

open access: yesMonthly notices of the Royal Astronomical Society, 2018
Determinations of the ultraviolet (UV) luminosity function of active galactic nuclei (AGN) at high redshifts are important for constraining the AGN contribution to reionization and understanding the growth of supermassive black holes.
Girish Kulkarni, G. Worseck, J. Hennawi
semanticscholar   +1 more source

Scalar potential model of redshift and discrete redshift [PDF]

open access: yesNew Astronomy, 2006
36 pages, 17 figures, Article in press New ...
openaire   +3 more sources

Model-independent constraints on dark energy evolution from low-redshift observations [PDF]

open access: yesMonthly notices of the Royal Astronomical Society, 2018
Knowing the late time evolution of the Universe and finding out the causes for this evolution are the important challenges of modern cosmology. In this work, we adopt a model-independent cosmographic approach and approximate the Hubble parameter ...
S. Capozziello   +2 more
semanticscholar   +1 more source

Correction to: Status of racial disparities between black and white women undergoing assisted reproductive technology in the US

open access: yesReproductive Biology and Endocrinology, 2020
An amendment to this paper has been published and can be accessed via the original article.
David B. Seifer   +3 more
doaj   +1 more source

Hubble Parameter and Baryon Acoustic Oscillation Measurement Constraints on the Hubble Constant, the Deviation from the Spatially Flat ΛCDM Model, the Deceleration–Acceleration Transition Redshift, and Spatial Curvature [PDF]

open access: yes, 2017
We compile a complete collection of reliable Hubble parameter H(z) data to redshift z ≤ 2.36 and use them with the Gaussian Process method to determine continuous H(z) functions for various data subsets.
Hai-Bo Yu, Bharat Ratra, Fayin Wang
semanticscholar   +1 more source

The Origin of Low-redshift Event Rate Excess as Revealed by the Low-luminosity Gamma-Ray Bursts

open access: yesThe Astrophysical Journal, 2023
The relation between the event rate of long gamma-ray bursts and the star formation rate is still controversial, especially at the low-redshift end. Dong et al.
X. F. Dong   +4 more
doaj   +1 more source

HUBBLE PARAMETER MEASUREMENT CONSTRAINTS ON THE REDSHIFT OF THE DECELERATION–ACCELERATION TRANSITION, DYNAMICAL DARK ENERGY, AND SPACE CURVATURE [PDF]

open access: yes, 2016
We compile an updated list of 38 measurements of the Hubble parameter H(z) between redshifts 0.07 ≤ z ≤ 2.36 and use them to place constraints on model parameters of constant and time-varying dark energy cosmological models, both spatially flat and ...
O. Farooq   +3 more
semanticscholar   +1 more source

Gravitational Redshift Test Using Eccentric Galileo Satellites. [PDF]

open access: yesPhysical Review Letters, 2018
We report on a new test of the gravitational redshift and thus of local position invariance, an integral part of the Einstein equivalence principle, which is the foundation of general relativity and all metric theories of gravitation.
P. Delva   +13 more
semanticscholar   +1 more source

Clustering at High Redshift [PDF]

open access: yes, 2006
2 pages Latex, To appear in the proceedings of "The mass of galaxies at low and high redshift", Venice, Oct 24-26, 2001,eds. R. Bender and A. Renzini (ESO Astrophysics Symposia, Springer-Verlag)
S. Cristiani   +4 more
openaire   +6 more sources

Home - About - Disclaimer - Privacy