Results 1 to 10 of about 926 (266)

Traces of Anisotropic Quasi-Regular Structure in the SDSS Data

open access: yesUniverse, 2021
The aim of this study is to search for quasi-periodical structures at moderate cosmological redshifts z ≲ 0.5. We mainly use the SDSS DR7 data on the luminous red galaxies (LRGs) with redshifts 0.16 ≤ z ≤ 0.47.
Andrei I. Ryabinkov   +1 more
doaj   +1 more source

Spatial homogeneity and redshift-distance laws [PDF]

open access: yesProceedings of the National Academy of Sciences, 1982
Spatial homogeneity in the radial direction of low-redshift galaxies is subjected to Kafka-Schmidt V/V m tests using well-documented samples. Homogeneity is consistent with the assumption of the Lundmark (quadratic redshift-distance) law, but large deviations from homogeneity are implied ...
J F, Nicoll, I E, Segal
openaire   +2 more sources

The Planetary Nebula Luminosity Function in the Era of Precision Cosmology

open access: yesFrontiers in Astronomy and Space Sciences, 2022
One of the great surprises of the late 1980s was the discovery that the [O III] λ5007 planetary nebula luminosity function (PNLF) could be used as a precision extragalactic standard candle.
Robin Ciardullo, Robin Ciardullo
doaj   +1 more source

Large-Scale Structure and the Redshift-Distance Relation [PDF]

open access: yesThe Astrophysical Journal, 1998
In efforts to demonstrate the linear Hubble law v = Hr from galaxy observations, the underlying simplicity is often obscured by complexities arising from magnitude-limited data. In this paper we point out a simple but previously unremarked fact: that the shapes and orientations of structures in redshift space contain in themselves independent ...
Jones, M. A., Fry, J. N.
openaire   +2 more sources

SUPERLUMINOUS SUPERNOVAE AS STANDARDIZABLE CANDLES AND HIGH-REDSHIFT DISTANCE PROBES [PDF]

open access: yesThe Astrophysical Journal, 2014
We investigate the use of type Ic Super Luminous Supernovae as standardizable candles and distance indicators. Their appeal as cosmological probes stems from their remarkable peak luminosities, hot blackbody temperatures and bright restframe ultraviolet emission.
Inserra, C., Smartt, S. J.
openaire   +5 more sources

The Truncated Lognormal Distribution as a Luminosity Function for SWIFT-BAT Gamma-Ray Bursts

open access: yesGalaxies, 2016
The determination of the luminosity function (LF) in Gamma ray bursts (GRBs) depends on the adopted cosmology, each one characterized by its corresponding luminosity distance.
Lorenzo Zaninetti
doaj   +1 more source

Can Cosmological Simulations Reproduce the Spectroscopically Confirmed Galaxies Seen at z ≥ 10?

open access: yesThe Astrophysical Journal Letters, 2023
Recent photometric detections of extreme ( z > 10) redshift galaxies from the JWST have been shown to be in strong tension with existing simulation models for galaxy formation and in the most acute case, in tension with ΛCDM itself.
B. W. Keller   +3 more
doaj   +1 more source

PHOTOMETRIC ESTIMATES OF REDSHIFTS AND DISTANCE MODULI FOR TYPE Ia SUPERNOVAE [PDF]

open access: yesThe Astrophysical Journal, 2010
Large planned photometric surveys will discover hundreds of thousands of supernovae (SNe), outstripping the resources available for spectroscopic follow-up and necessitating the development of purely photometric methods to exploit these events for cosmological study.
Kessler, Richard   +16 more
openaire   +5 more sources

Luminosity distance and anisotropic sky-sampling at low redshifts: A numerical relativity study [PDF]

open access: yesPhysical Review D, 2021
20 pages, 12 figures, v2: matches published version in Phys. Rev.
Macpherson, Hayley J., Heinesen, Asta
openaire   +2 more sources

Testing the local spacetime dynamics by heliospheric radiocommunication methods [PDF]

open access: yesAnnales Geophysicae, 2008
According to general relativistic theories, cosmological spacetime is dynamic. This prediction is in excellent agreement with the huge majority of astronomical observations on large cosmic scales, especially the observations of cosmological redshifts ...
H.-J. Fahr, M. Siewert
doaj   +1 more source

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