Results 41 to 50 of about 10,764,000 (383)
Padé Approximant and Minimax Rational Approximation in Standard Cosmology
Galaxies, 2016 The luminosity distance in the standard cosmology as given by ΛCDM and, consequently, the distance modulus for supernovae can be defined by the Padé approximant.
Lorenzo Zaninetti
doaj +1 more source
The Dragonfly Nearby Galaxies Survey. III. The Luminosity Function of the M101 Group [PDF]
, 2017 We obtained follow-up HST observations of the seven low surface brightness galaxies discovered with the Dragonfly Telephoto Array in the field of the massive spiral galaxy M101.
S. Danieli +6 more
semanticscholar +1 more source
Evolution of the Luminosity Function [PDF]
Symposium - International Astronomical Union, 1986 In this review, the currently published, complete, spectroscopically identified samples of quasars are assembled to produce a composite luminosity function, independent of evolutionary assumptions. Two interpretations of the change with cosmic time provide reasonable fits to the data.
openaire +2 more sources
The z ∼ 6 Luminosity Function Fainter than −15 mag from the Hubble Frontier Fields: The Impact of Magnification Uncertainties [PDF]
, 2016 We use the largest sample of galaxies to date from the first four Hubble Frontier Fields clusters to set constraints on the shape of the luminosity functions (LFs) to fainter than mag.
R. Bouwens +5 more
semanticscholar +1 more source
The Truncated Lognormal Distribution as a Luminosity Function for SWIFT-BAT Gamma-Ray Bursts
Galaxies, 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
Altered Luminosity Functions of Relativistically Beamed Jet Populations [PDF]
Astrophys.J.599:105-115,2003, 2003 The intrinsic luminosity functions of extremely fast jets found in many active galaxies and gamma-ray bursts are difficult to measure since their apparent luminosities are strongly affected by relativistic beaming. Past studies have only provided analytical predictions for the beamed characteristics of populations in which all jets have the same ...
arxiv +1 more source
The Quasar Luminosity Function [PDF]
Symposium - International Astronomical Union, 1996 Recent results at high redshifts are briefly reviewed. An analysis of the evolution of the quasar luminosity function based on the recently published Hawkins & Véron (1995) variability-selected quasar sample is presented. The results support the conclusions of earlier work that suggested the simple two power law luminosity function, of invariant ...
openaire +2 more sources
The Properties and Luminosity Function of Extremely Low Luminosity Galaxies [PDF]
The Astrophysical Journal, 2005 We examine a sample of low redshift (10 < d < 150 Mpc) galaxies including galaxies with r-band absolute magnitudes as faint as -12.5 (for h=1), selected from the Sloan Digital Sky Survey Data Release 2 (SDSS). The sample is unique in containing galaxies of extremely low luminosities in a wide range of environments, selected with uniform and well ...
J. Brinkmann +6 more
openaire +4 more sources
The CALYMHA survey : Lyα luminosity function and global escape fraction of Lyα photons at z = 2.23 [PDF]
, 2016 We present the CAlibrating LYMan-α with Hα (CALYMHA) pilot survey and new results on Lyman α (Lyα) selected galaxies at z ∼ 2. We use a custom-built Lyα narrow-band filter at the Isaac Newton Telescope, designed to provide a matched volume coverage to ...
D. Sobral +8 more
semanticscholar +1 more source
On the Number of Galaxies at High Redshift
Galaxies, 2015 The number of galaxies at a given flux as a function of the redshift, z, is derived when the z-distance relation is non-standard. In order to compare different models, the same formalism is also applied to the standard cosmology.
Lorenzo Zaninetti
doaj +1 more source