Results 11 to 20 of about 49 (45)

21st Century Statistical and Computational Challenges in Astrophysics

, 2021
International audienceModern astronomy has been rapidly increasing our ability to see deeper into the universe, acquiring enormous samples of cosmic populations.
Babu, Gutti Jogesh, Feigelson, Eric D., de Souza, Rafael S., Ishida, Emille E.O.   +3 more
core   +1 more source

Nested Sampling Methods

, 2023
Nested sampling (NS) computes parameter posterior distributions and makes Bayesian model comparison computationally feasible. Its strengths are the unsupervised navigation of complex, potentially multi-modal posteriors until a well-defined termination ...
Buchner, J., Buchner, Johannes
core   +1 more source

Elements of Statistics

, 2016
International audienceThis chapter is devoted to two objectives. The first one is to answer the request expressed by attendees of the first Astrostatistics School (Annecy, October 2013) to be provided with an elementary vademecum of statistics that would
Grégoire, Gérard, G. Grégoire
core   +1 more source

Recent advances in Bayesian inference in cosmology and astroparticle physics thanks to the multinest algorithm

, 2013
We present a new algorithm, called MultiNest, which is a highly efficient alternative to traditional Markov Chain Monte Carlo (MCMC) sampling of posterior distributions.
Feroz, F, Trotta, R, Hobson, M, de Austri, RR   +3 more
core   +1 more source

Insights into the content and spatial distribution of dust from the integrated spectral properties of galaxies

, 2013
JC and SC acknowledge the support of the European Commission through the Marie Curie Initial Training Network ELIXIR under contract PITN-GA-2008-214227.
V. Wild, S. Charlot, Chevallard, J., Wild, V., B. Wandelt, Charlot, S., Wandelt, B., Wild, Vivienne, J. Chevallard   +8 more
core   +1 more source

Distributions of Wide Binary Stars in Theory and in Gaia Data. II. Reconstruction of Sample Probability Density of True Orbit Sizes

The Astronomical Journal
Wide binary stars are important for testing alternative models of gravitation in the weak-field regime and understanding the statistical outcomes of dynamical interactions in the general Galactic field. The Gaia mission’s collection of weakly bound pairs
Valeri V. Makarov
doaj   +1 more source

A Bias-corrected Luminosity Function for Red Supergiant Supernova Progenitor Stars

The Astrophysical Journal Letters
The apparent tension between the luminosity functions of red supergiant (RSG) stars and of RSG progenitors of Type II supernovae (SNe) is often referred to as the RSG problem and it motivated some to suggest that many RSGs end their life without an SN ...
Nora L. Strotjohann, Eran O. Ofek, Avishay Gal-Yam   +2 more
doaj   +1 more source

Euclid preparation: LXVIII. Extracting physical parameters from galaxies with machine learning

Euclid Collaboration: I. Kovačić et al.The Euclid mission is generating a vast amount of imaging data in four broadband filters at a high angular resolution. This data will allow for the detailed study of mass, metallicity, and stellar populations across
Fosalba, Pablo, Kovačić, Inja, García-Bellido, Juan, Akrami, Yashar, Camacho-Quevedo, Benjamin, Castander, Francisco J., Gaztañaga, Enrique, Serrano, Santiago, Rebolo López, Rafael, Courbin, Frédéric, Siudek, Malgorzata, Montoro, A., Euclid Collaboration   +12 more
core   +2 more sources

Knudsen Number as a Nonthermal Parameter: Possible Origin of Skewness in Space Plasma Distributions

The Astrophysical Journal
Non-Maxwellian distributions and their origins in space plasma have attracted significant attention due to their prevalence and impact on various astrophysical and space-related phenomena.
Iván Gallo-Méndez, Adolfo F. Viñas, Pablo S. Moya   +2 more
doaj   +1 more source

Distributions of Wide Binary Stars in Theory and in Gaia Data. I. Generalized Ambartsumian (1937) Approach and the Family of Power-law Distributions of Eccentricity

The Astronomical Journal
The orbital parameter space of wide, weakly bound binary stars has been shaped by the still poorly known circumstances of their formation, as well as by subsequent dynamical evolution in parent clusters and in the field.
Valeri V. Makarov
doaj   +1 more source