Results 81 to 90 of about 706,236 (203)

QSOs and galaxies: lensing, clustering and redshift-space distortions [PDF]

open access: yes, 2008
The aim of this thesis is to analyze statistically the available QSO, LRG, galaxy and cluster samples in order to estimate the QSO-galaxy lensing anti-correlation signal and measure the mass of foreground galaxies and clusters and to estimate the QSO-LRG
Mountrichas, Georgios
core  

A Scalable Gaussian Process Approach to Shear Mapping with MuyGPs

open access: yesThe Astrophysical Journal
Analysis of cosmic shear is an integral part of understanding structure growth across cosmic time, which in turn provides us with information about the nature of dark energy.
Gregory Sallaberry   +6 more
doaj   +1 more source

COSMOLOGY, COSMOMICROPHYSICS AND GRAVITATION

open access: yesOdessa Astronomical Publications, 2013
We derive approximate formulas for the coordinates and magnification of critical images of a point source in a vicinity of a cusp caustic arising in the gravitational lens mapping. In the lowest (zero-order) approximation, these formulas were obtained in
A. N. Alexandrov   +2 more
doaj   +1 more source

Alluvial ridge morphology on avulsing rivers

open access: yesSedimentology, Volume 73, Issue 6, Page 2311-2337, October 2026.
ABSTRACT Alluvial ridges are built by preferential channel‐belt deposition and control river avulsions, yet a systematic analysis of their morphology has been missing. To address this gap, we analyse a globally distributed dataset of 8970 alluvial ridge flanks on 14 different rivers.
James H. Gearon, Douglas A. Edmonds
wiley   +1 more source

Diagnosing CESM2 Biases in Northwest Indian Ocean Warming and Its Implications for India Summer Monsoon Precipitation

open access: yesGeophysical Research Letters, Volume 53, Issue 17, 16 September 2026.
Abstract Declining monsoon rainfall over agriculture‐dependent Eastern Central India (ECI) during 1901–2014 threatens regional food and water security. Observations link ECI drying to rapid Northwest Indian Ocean (NWIO) warming, which weakens monsoon circulation.
Yunfan Chen   +7 more
wiley   +1 more source

OGLE 2008–BLG–290 : an accurate measurement of the limb darkening of a galactic bulge K giant spatially resolved by microlensing [PDF]

open access: yes, 2010
Context. Not only is gravitational microlensing a successful tool for discovering distant exoplanets, but it also enables characterization of the lens and source stars involved in the lensing event. Aims.
Riffeser, A.   +562 more
core   +1 more source

Weak Gravitational Lensing around Low Surface Brightness Galaxies in the DES Year 3 Data

open access: yesThe Open Journal of Astrophysics
We present galaxy-galaxy lensing measurements using a sample of low surface brightness galaxies (LSBGs) drawn from the Dark Energy Survey Year 3 (Y3) data as lenses.
N. Chicoine   +104 more
doaj   +1 more source

Gravitational lensing

open access: yes, 2017
Gravitational lensing is a consequence of general relativity, where the gravitational force due to a massive object bends the paths of light originating from distant objects lying behind it.
Dodelson, Scott, Scott Dodelson
core   +1 more source

Computer Programming to Advance Gravitational Lensing [PDF]

open access: yes, 2013
The purpose of this research was to create a computer code that would numerically test a Poisson equation relating the mass distribution of a lens galaxy cluster to weak gravitational shear.
Roche, Alex
core   +1 more source

Exploring Joint Observation of the CSST Shear and Clustering of Astrophysical Gravitational Wave Source Measurements

open access: yesThe Astrophysical Journal
We present a comprehensive forecast for cosmological constraints using the joint observation of the cosmic shear signal from the Chinese Space Station Survey Telescope (CSST) and the clustering signal from the next-generation gravitational wave (GW ...
Pengfei Su   +6 more
doaj   +1 more source

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