Results 1 to 10 of about 318,690 (388)

Optimal redshift weighting for redshift-space distortions [PDF]

Monthly Notices of the Royal Astronomical Society, 2016
10 pages, 5 figures, submitted to ...
Will J. Percival, Rossana Ruggeri, Yuting Wang, Yuting Wang, Héctor Gil-Marín, Fangzhou Zhu, Gong-Bo Zhao   +6 more
openaire   +9 more sources

The 2dF Galaxy Redshift Survey: spectra and redshifts [PDF]

Monthly Notices of the Royal Astronomical Society, 2001
The 2dF Galaxy Redshift Survey (2dFGRS) is designed to measure redshifts for approximately 250 000 galaxies. This paper describes the survey design, the spectroscopic observations, the redshift measurements and the survey data base. The 2dFGRS uses the 2dF multifibre spectrograph on the Anglo-Australian Telescope, which is capable of observing 400 ...
Colless, Matthew, Dalton, Gavin, Maddox, Steve, Sutherland, Will, Norberg, Peder, Cole, Shaun, Bland-Hawthorn, Joss, Bridges, Terry, Cannon, Russell, Collins, Chris, Couch, Warrick, Cross, Nicholas, Deeley, Kathryn, De Propris, Roberto, Driver, Simon P., Efstathiou, George, Ellis, Richard S., Frenk, Carlos S., Glazebrook, Karl, Jackson, Carole, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Madgwick, Darren, Peacock, John A., Peterson, Bruce A., Price, Ian, Seaborne, Mark, Taylor, Keith, 2dFGRS Team   +29 more
openaire   +7 more sources

Non-cosmological redshifts [PDF]

Space Science Reviews, 1977
L’introduction de lignes d’univers brisées dans la théorie de la gravitation de Hoyle et Narlikar permet de rendre compte de la création de matière. Cette matière qui se compose de masses inertielles plus petites se manifeste par des décalages spectraux vers le rouge anormaux.
J. V. Narlikar
openalex   +4 more sources

Generalized redshift formula through an energy-based framework [PDF]

Scientific Reports
Redshift is a crucial concept in physics; it has significant implications for our understanding of the dynamics and evolution of the cosmos. In this article, we introduce a generalized formula to determine the redshift parameter.
C. Ortiz, F. Ibarra-Castor
doaj   +2 more sources

Using Multivariate Imputation by Chained Equations to Predict Redshifts of Active Galactic Nuclei

Frontiers in Astronomy and Space Sciences, 2022
Redshift measurement of active galactic nuclei (AGNs) remains a time-consuming and challenging task, as it requires follow up spectroscopic observations and detailed analysis.
Spencer James Gibson, Aditya Narendra, Maria Giovanna Dainotti, Maria Giovanna Dainotti, Malgorzata Bogdan, Malgorzata Bogdan, Agnieszka Pollo, Agnieszka Pollo, Artem Poliszczuk, Enrico Rinaldi, Enrico Rinaldi, Enrico Rinaldi, Ioannis Liodakis   +12 more
doaj   +1 more source

Electromagnetic Waves in Cosmological Spacetime

Universe, 2023
We consider the propagation of electromagnetic waves in the Friedmann–Lemaître–Robertson–Walker metric. The exact solutions for plane and spherical wave are written down. The corresponding redshift, amplitude change, and dispersion are discussed. We also
Denitsa Staicova, Michail Stoilov
doaj   +1 more source

Optical Characteristics of Electromagnetic Radiation, Emitted by Particles or Stars Moving near Supermassive Black Hole

Galaxies, 2021
The general problem of calculating of the propagation of electromagnetic radiation from particles or stars moving in the vicinity of a supermassive black hole is considered in geometrical optics approximation within the framework of the general theory of
Stanislav Komarov
doaj   +1 more source

A Modified Vilsmeier–Haack Strategy to Construct β-Pyridine-Fused 5,10,15,20-Tetraarylporphyrins

SynOpen, 2020
A modified Vilsmeier–Haack strategy has been developed to construct a novel series of π-extended nickel(II) or copper(II) complexes of 2-chloro-3-formyl- and 3-formylpyrido[2,3-b]porphyrins from 2-acetamido-meso-tetraarylporphyrins. After chromatographic
Pargat Singh, Mahendra Nath
doaj   +1 more source

Does Lorentz Relativistic Mass Make Dark Energy Superfluous?

Universe, 2022
This paper shows that a simple and relativistic extension of Newtonian gravity that takes into account Lorentz relativistic mass leads to predictions that fit supernova observations of magnitude versus redshift without the need to introduce dark energy ...
Espen Gaarder Haug
doaj   +1 more source

Measurement methods for gamma-ray bursts redshifts

Frontiers in Astronomy and Space Sciences, 2023
In the era of multi-messenger astronomy, gamma-ray bursts (GRBs) with known redshifts, especially high-redshift GRBs, are a powerful tool for studying the structure and evolution of the early Universe.
Mengci Li, Mengci Li, Zhe Kang, Chao Wu, Chengzhi Liu, Chengzhi Liu, Jirong Mao, Jirong Mao, Zhenwei Li, Shiyu Deng, Shiyu Deng, Bingli Niu, Bingli Niu, Ping Jiang, Ping Jiang   +14 more
doaj   +1 more source