Results 31 to 40 of about 221,703 (328)
On estimating redshift and luminosity distributions in photometric redshift surveys [PDF]
, 2007 The luminosity functions of galaxies and quasars provide invaluable information about galaxy and quasar formation. Estimating the luminosity function from magnitude limited samples is relatively straightforward, provided that the distances to the objects
Sheth, Ravi K.
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The Radio-to-Submillimeter Flux Density Ratio of Galaxies as a Measure of Redshift [PDF]
, 2000 We re-examine the technique of determining the redshifts of galaxies from the ratio of the submillimeter-to-radio continuum flux densities based on a recently published catalog of 850~$\mu$m sources.
Bertoldi, Scott, Siebenmorgen
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Redshifting rings of power [PDF]
Physical Review D, 2003 The cosmic microwave background (CMB) has provided a precise template for features in the linear power spectrum: the matter-radiation turnover, sound horizon drop, and acoustic oscillations. In a two dimensional power spectrum in redshift and angular space, the features appear as distorted rings, and yield simultaneous, purely geometric, measures of ...
Hu, Wayne, Haiman, Zoltan
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Automated reliability assessment for spectroscopic redshift measurements [PDF]
, 2018 We present a new approach to automate the spectroscopic redshift reliability assessment based on machine learning (ML) and characteristics of the redshift probability density function (PDF).
A. Schmitt +41 more
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Redshift and Photon Energy Attenuation Constant in Vacuum
Doklady Belorusskogo gosudarstvennogo universiteta informatiki i radioèlektronikiThere obtained an estimate of the minimum value of the photon energy attenuation constant in vacuum α: α = 8 · 10–19 m–1 based on quantum concepts of the structure of vacuum and data on the red shift of the emitter spectra of distant galaxies. Presumably,
A. A. Kurayev, V. V. Matveyenka
doaj +1 more source
The Origin of Low-redshift Event Rate Excess as Revealed by the Low-luminosity Gamma-Ray Bursts
The 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
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Redshift Surveys With 2DF [PDF]
Highlights of Astronomy, 1998 This IAU Joint Discussion proposes to address the subject of redshift surveys in the 21st century. This paper, however, deals with two major new redshift surveys that those involved sincerely hope will be completed in the 20th century. Nonetheless, these surveys are relevant to the topic of the meeting, as they clearly foreshadow the scope and style of
Colless, Matthew, Boyle, Brian
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Redshift Survey of 12 Moderate-redshift Clusters
Research Notes of the AAS, 2022 Abstract We conducted a redshift survey of 12 X-ray selected clusters in the redshift range z = 0.35–0.50 with MMT/Hectospec. The redshift surveys confirm that these clusters are massive systems. There are no massive groups or clusters projected along the line of sight that might contaminate the observed cluster X-ray properties ...
Kenneth J. Rines, Margaret J. Geller
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, 2006 The redshift distribution of all 46,400 quasars in the Sloan Digital Sky Survey (SDSS) Quasar Catalog III, Third Data Release, is examined. Six Peaks that fall within the redshift window below z = 4, are visible.
Bajan K. +10 more
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Improved redshifts for SDSS quasar spectra [PDF]
, 2010 A systematic investigation of the relationship between different redshift estimation schemes for more than 91000 quasars in the Sloan Digital Sky Survey (SDSS) Data Release 6 (DR6) is presented.
Abazajian +30 more
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