Results 71 to 80 of about 10,764,000 (383)
The galaxy luminosity function in clusters and the field [PDF]
, 1997 We present the results from a CCD survey of the B-band luminosity functions of 9 nine clusters of galaxies, and compare them with published photographic luminosity functions of nearby poor clusters like Virgo and Fornax and also to the field luminosity function. We derive a composite luminosity function by taking the weighted mean of all the individual
arxiv +1 more source
The galaxy UV luminosity function at z≃ 2–4; new results on faint-end slope and the evolution of luminosity density [PDF]
, 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
ВЛИЯНИЕ ГРАВИТАЦИОННОГО ЛИНЗИРОВАНИЯ НА ФУНКЦИЮ СВЕТИМОСТИ КВАЗАРОВ
Odessa 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
The 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
Constraining the AGN Luminosity Function from JWST with the X-Ray Background
The 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
What is L*?: Anatomy of the Galaxy Luminosity Function [PDF]
Astrophys.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
The Luminosity Function of ω Centauri [PDF]
The Astronomical Journal, 1999 Deep HST-WFPC2 observations of the stellar population in the globular cluster Omega Cen (NGC 5139) have been used to measure the luminosity function of main sequence stars at the low-mass end. Two fields have been investigated, located respectively ~4.6' and ~7' away from the cluster center, or near the half-light radius of this cluster (~4.8').
openaire +3 more sources
Galaxy Luminosity Function in Groups [PDF]
The Astrophysical Journal, 1998 Accepted for publication in ApJ, 5 pages including 3 ...
Carlos Valotto +2 more
openaire +3 more sources
PROBING THE ULTRAVIOLET LUMINOSITY FUNCTION OF THE EARLIEST GALAXIES WITH THE RENAISSANCE SIMULATIONS [PDF]
, 2015 In this paper, we present the first results from the Renaissance Simulations, a suite of extremely high-resolution and physics-rich AMR calculations of high-redshift galaxy formation performed on the Blue Waters supercomputer.
B. O’Shea +3 more
semanticscholar +1 more source
The fading of young stellar populations and the luminosity functions of dwarf, irregular and starburst galaxies [PDF]
, 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