Results 81 to 90 of about 11,010,167 (402)

Identification of the brightest Lyα emitters at z = 6.6 : Implications for the evolution of the luminosity function in the reionization era [PDF]

open access: yes, 2015
Using wide-field narrow-band surveys, we provide a new measurement of the z = 6.6 Lymanα emitter (LAE) luminosity function (LF), which constraints the bright end for the first time.
J. Matthee   +5 more
semanticscholar   +1 more source

ВЛИЯНИЕ ГРАВИТАЦИОННОГО ЛИНЗИРОВАНИЯ НА ФУНКЦИЮ СВЕТИМОСТИ КВАЗАРОВ

open access: yesOdessa Astronomical Publications, 2011
The function of quasar distribution on apparent brightness is discussed. This function is found on base of suggestion that quasars, at least partly, are strong gravitational lensing images of the active nuclei of distant galaxies.
Ю. Л. Бухмастова
doaj   +1 more source

General Physical Properties of Gamma-Ray-emitting Radio Galaxies

open access: yesThe Astrophysical Journal Supplement Series, 2023
We study the radio galaxies with known redshifts detected by the Fermi satellite after 10 yr of data (4FGL-DR2). We use a one-zone leptonic model to fit the quasi-simultaneous multiwavelength data of these radio galaxies and study the distributions of ...
Yongyun Chen   +6 more
doaj   +1 more source

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

The 5–10 keV AGN luminosity function at 0.01 < z < 4.0 [PDF]

open access: yes, 2016
The active galactic nuclei X-ray luminosity function traces actively accreting supermassive black holes and is essential for the study of the properties of the active galactic nuclei (AGN) population, black hole evolution, and galaxy-black hole ...
S. Fotopoulou   +16 more
semanticscholar   +1 more source

What is L*?: Anatomy of the Galaxy Luminosity Function [PDF]

open access: yesAstrophys.J. 627 (2005) L89-L92, 2005
Using the empirical relations between the central galaxy luminosity and the halo mass, and between the total galaxy luminosity in a halo and the halo mass, we construct the galaxy luminosity function (LF). To the luminosity of the central galaxy in a halo of a given mass we assign log-normal scatter with a mean calibrated against the observations.
arxiv   +1 more source

Galaxy Luminosity Function in Groups [PDF]

open access: yesThe Astrophysical Journal, 1998
Accepted for publication in ApJ, 5 pages including 3 ...
Carlos Valotto   +2 more
openaire   +3 more sources

The galaxy UV luminosity function at z≃ 2–4; new results on faint-end slope and the evolution of luminosity density [PDF]

open access: yes, 2015
We present a new, robust measurement of the evolving rest-frame ultraviolet (UV) galaxy luminosity function (LF) over the key redshift range from z ≃ 2 to z ≃ 4.
S. Parsa   +3 more
semanticscholar   +1 more source

Constraining the AGN Luminosity Function from JWST with the X-Ray Background

open access: yesThe Astrophysical Journal Letters, 2023
We predict the X-ray background (XRB) expected from the population of quasars detected by the James Webb Space Telescope spectroscopic surveys over the redshift range z ∼ 4–7.
Hamsa Padmanabhan, Abraham Loeb
doaj   +1 more source

The fading of young stellar populations and the luminosity functions of dwarf, irregular and starburst galaxies [PDF]

open access: yes, 1997
Dwarf, irregular and infrared-luminous starburst galaxies are all known to have "steep" luminosity functions with faint-end behavior roughly phi(L)-propto- L^(-1.8). This form is exactly what is expected if the luminosities of these objects fade with time as L-propto-t^(-1.3), because the objects spend more time at low luminosities than high, even if ...
arxiv   +1 more source

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