Results 31 to 40 of about 335,375 (390)
Accurate precision cosmology with redshift unknown gravitational wave sources [PDF]
, 2020 Gravitational waves can provide an accurate measurement of the luminosity distance to the source but cannot provide the source redshift unless the degeneracy between mass and redshift can be broken.
S. Mukherjee +3 more
semanticscholar +1 more source
Hemijska Industrija, 2008 If we assume that the observed Redshift of starlight is due to the Doppler effect we end up with models of the universe which contradict the basic laws of science. If we assume that the red shift may be due to a tiring of light, an assumption still to be
Levenspiel Octave
doaj +1 more source
[O III] / [N II] as an abundance indicator at high redshift [PDF]
, 2004 Among 'empirical' methods of estimating oxygen abundances in extragalactic H II regions, the use of the ratio of nebular lines of [O III] and [N II], first introduced by Alloin et al., is reappraised with modern calibration data and shown to have certain
M. Pettini, B. Pagel
semanticscholar +1 more source
HIGH-REDSHIFT GALAXIES IN THE HUBBLE DEEP FIELD : COLOUR SELECTION AND STAR FORMATION HISTORY TO Z 4 [PDF]
, 1996 The Lyman decrement associated with the cumulative effect of H I in QSO absorption systems along the line of sight provides a distinctive feature for identifying galaxies at z ≳ 2.5.
P. Madau +5 more
semanticscholar +1 more source
Revisiting a Negative Cosmological Constant from Low-Redshift Data [PDF]
Symmetry, 2019 Persisting tensions between high-redshift and low-redshift cosmological observations suggest the dark energy sector of the Universe might be more complex than the positive cosmological constant of the Λ CDM model.
L. Visinelli, S. Vagnozzi, U. Danielsson
semanticscholar +1 more source
EAZY: A Fast, Public Photometric Redshift Code [PDF]
, 2008 We describe a new program for determining photometric redshifts, dubbed EAZY. The program is optimized for cases where spectroscopic redshifts are not available, or are only available for a biased subset of the galaxies.
G. Brammer, P. V. van Dokkum, P. Coppi
semanticscholar +1 more source
Does the Black Hole Merger Rate Evolve with Redshift? [PDF]
Astrophysical Journal, 2018 We explore the ability of gravitational-wave detectors to extract the redshift distribution of binary black hole (BBH) mergers. The evolution of the merger rate across redshifts 0 < z ≲ 1 is directly tied to the formation and evolutionary processes ...
M. Fishbach, D. Holz, W. Farr
semanticscholar +1 more source
Nature, 1979 Evidence concerning the associations between QSOs and galaxies with similar redshifts, and pairs with very different redshifts is reviewed. It is concluded that both kinds of associations are likely to be real.
openaire +3 more sources
Metals at High Redshifts [PDF]
Proceedings of the International Astronomical Union, 2001 The amount of metals present in the Universe and its cosmological evolution is a key issue for our understanding of how star formation proceeds from the collapse of the first objects to the formation of present day galaxies. We discuss here recent results at the two extremes of the density scale.1.
Patrick Petitjean, Patrick Petitjean
openaire +4 more sources
The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic Survey DR14 quasar sample: a tomographic measurement of cosmic structure growth and expansion rate based on optimal redshift weights [PDF]
Monthly notices of the Royal Astronomical Society, 2018 We develop a new method, which is based on the optimal redshift weighting scheme, to extract the maximal tomographic information of baryonic acoustic oscillations (BAO) and redshift space distortions (RSD) from the extended Baryon Oscillation ...
Gong-Bo Zhao +30 more
semanticscholar +1 more source