☆ 4.7 Article

Measuring line-of-sight shear with Einstein rings: a proof of concept

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

Related references

Note: Only part of the references are listed.

Article Astronomy & Astrophysics

TDCOSMO VII. Boxyness/discyness in lensing galaxies: Detectability and impact on H0

Lyne Van de Vyvere et al.

Summary: In the study of gravitational lensing, the impact of azimuthal structures on extended images of the source and H-0 inference has not been characterized. This study addresses this gap by creating mock images with multipolar components and exploring the detectability of image deformation and its impact on H-0 inference. The results show that multipole deformations are detectable and can introduce small changes to the time-delays, but their impact on H-0 inference is generally minimal.

ASTRONOMY & ASTROPHYSICS (2022)

Add to Collection

Article Astronomy & Astrophysics

Extracting the Subhalo Mass Function from Strong Lens Images with Image Segmentation

Bryan Ostdiek et al.

Summary: Detecting substructure within strongly lensed images using machine learning can provide insights into the nature of dark matter. By training a neural network on images with a single subhalo, the network can locate and determine the mass of subhalos without the need for detailed lens and source modeling. The network can learn the gravitational lensing effect and detect substructure even in locations further away from the Einstein ring than those used in training.

ASTROPHYSICAL JOURNAL (2022)

Add to Collection

Article Astronomy & Astrophysics

Galaxy-galaxy strong lens perturbations: line-of-sight haloes versus lens subhaloes

Qiuhan He et al.

Summary: This study rederives the relative number density between intervening line-of-sight haloes and lens subhaloes in galaxy-galaxy strong lensing observations, finding an overestimation of detectable line-of-sight perturbers in previous literature.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)

Add to Collection

Article Astronomy & Astrophysics

Substructure detection reanalysed: dark perturber shown to be a line-of-sight halo

Atinc Cagan Sengul et al.

Summary: Observing structures at subgalactic scales is crucial for studying the properties of dark matter. In future surveys, it is important to distinguish between line-of-sight haloes and subhalos to avoid making incorrect inferences about the nature of dark matter. This study reanalyzes a subgalactic structure previously found using gravitational imaging and finds that it is a line-of-sight halo with a higher redshift and a larger mass than previously estimated.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)

Add to Collection

Article Astronomy & Astrophysics

The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package*

Adrian M. Price-Whelan et al.

Summary: The Astropy Project is an open-source Python package that provides commonly needed functionality to the astronomical community. Its core package, astropy, serves as the foundation for specialized projects and packages. This article summarizes the key features of the core package and provides updates on the project. It also discusses the connections with astronomical observatories and missions, and the future outlook and challenges of the Astropy Project.

ASTROPHYSICAL JOURNAL (2022)

Add to Collection

Article Astronomy & Astrophysics

Gravitational lenses in arbitrary space-times

Pierre Fleury et al.

Summary: This article introduces a general formalism to describe multiple lenses within an arbitrary space-time background, providing a rigorous derivation of the lens equation, amplification, and time delays. The results can be applied to a wide range of scenarios, from strong lensing in anisotropic cosmologies to line-of-sight perturbations beyond the tidal regime.

CLASSICAL AND QUANTUM GRAVITY (2021)

Add to Collection

Article Astronomy & Astrophysics

zeus: a PYTHON implementation of ensemble slice sampling for efficient Bayesian parameter inference

Minas Karamanis et al.

Summary: zeus is a well-tested Python implementation of the ESS method for Bayesian parameter inference, which requires minimal hand-tuning and is insensitive to linear correlations. It performs efficiently on a large number of CPUs.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

Add to Collection

Article Astronomy & Astrophysics

Combining strong and weak lensing estimates in the COSMOS field

Felix Arjun Kuhn et al.

Summary: The combined cosmic shear analysis of strong lensing and galaxy shape measurements allows for a 2-sigma detection of the cross-correlation signal between the two complementary measurements. With large samples of lenses available in the future, the covariance of the signal of the two probes enables systematic checks and cross-calibration.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2021)

Add to Collection

Article Astronomy & Astrophysics

Galaxy-lens determination of H0: the effect of the ellipse plus shear modelling assumption

Matthew R. Gomer et al.

Summary: The study reveals that simplified assumptions about galaxy lenses can affect the recovery of parameters such as H-0, while also identifying a new statistical inconsistency phenomenon. The fitting of synthetic quad populations with deviations from elliptical shape may lead to biases in the results.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

Add to Collection

Article Astronomy & Astrophysics

Line-of-sight effects in strong gravitational lensing

Pierre Fleury et al.

Summary: This article introduces a new theoretical framework to model line-of-sight effects in strong-gravitational-lensing systems, with promising applications. The approach relies on the dominant-lens approximation and allows for modeling any sub-critical perturbation. The proposed method can extract a specific notion of line-of-sight shear from strong-lensing images and investigate distortions of critical curves under these effects, providing valuable insights for understanding the large-scale structure and dark-matter halo profiles of the Universe.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2021)

Add to Collection

Article Astronomy & Astrophysics

Cosmology from weak lensing alone and implications for the Hubble tension

Alex Hall

Summary: The study investigates the constraints of Lambda cold dark matter parameters in weak lensing, improving upon previous studies through the use of the halo model. It explains the limited constraint on the Hubble constant by cosmic shear, and how degeneracies between parameters can be broken to achieve more accurate constraints. It also highlights the challenges in achieving strong constraints on the Hubble constant with upcoming lensing surveys.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

Add to Collection

Article Computer Science, Theory & Methods

Ensemble slice sampling Parallel, black-box and gradient-free inference for correlated & multimodal distributions

Minas Karamanis et al.

Summary: Slice sampling is a powerful Markov Chain Monte Carlo algorithm, but sensitive to user-specified parameters and struggles with strongly correlated distributions. Ensemble Slice Sampling introduces a new class of algorithms that adaptively tune parameters and utilize parallel walkers to efficiently handle strong correlations, significantly improving sampling efficiency.

STATISTICS AND COMPUTING (2021)

Add to Collection

Article Astronomy & Astrophysics

TDCOSMO: I. An exploration of systematic uncertainties in the inference of H0 from time-delay cosmography

M. Millon et al.

ASTRONOMY & ASTROPHYSICS (2020)

Add to Collection

Article Astronomy & Astrophysics

Planck 2018 results: VI. Cosmological parameters

N. Aghanim et al.

ASTRONOMY & ASTROPHYSICS (2020)

Add to Collection

Article Astronomy & Astrophysics

STRIDES: a 3.9 per cent measurement of the Hubble constant from the strong lens system DES J0408-5354

A. J. Shajib et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2020)

Add to Collection

Article Astronomy & Astrophysics

H0LiCOW-XIII. A 2.4 per cent measurement of H0 from lensed quasars: 5.3σ tension between early- and late-Universe probes

Kenneth C. Wong et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2020)

Add to Collection

Article Astronomy & Astrophysics

TDCOSMO: III. Dark matter substructure meets dark energy. The effects of (sub)halos on strong-lensing measurements of H0

D. Gilman et al.

ASTRONOMY & ASTROPHYSICS (2020)

Add to Collection

Article Astronomy & Astrophysics

The impact of mass map truncation on strong lensing simulations

Lyne Van de Vyvere et al.

ASTRONOMY & ASTROPHYSICS (2020)

Add to Collection

Article Astronomy & Astrophysics

Galaxy structure with strong gravitational lensing: decomposing the internal mass distribution of massive elliptical galaxies

James W. Nightingale et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2019)

Add to Collection

Article Astronomy & Astrophysics

H0LiCOW-IX. Cosmographic analysis of the doubly imaged quasar SDSS 1206+4332 and a new measurement of the Hubble constant

S. Birrer et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2019)

Add to Collection

Article Astronomy & Astrophysics

An Accurate Physical Model for Halo Concentrations

Benedikt Diemer et al.

ASTROPHYSICAL JOURNAL (2019)

Add to Collection

Article Astronomy & Astrophysics

Half-mass Radii for ∼7000 Galaxies at 1.0 ≤ z ≤ 2.5: Most of the Evolution in the Mass-Size Relation Is Due to Color Gradients

Katherine A. Suess et al.

ASTROPHYSICAL JOURNAL (2019)

Add to Collection

Article Astronomy & Astrophysics

AutoLens: automated modeling of a strong lens's light, mass, and source

J. W. Nightingale et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2018)

Add to Collection

Article Astronomy & Astrophysics

Modelling the line-of-sight contribution in substructure lensing

Giulia Despali et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2018)

Add to Collection

Article Astronomy & Astrophysics

lenstronomy: Multi-purpose gravitational lens modelling software package

Simon Birrer et al.

PHYSICS OF THE DARK UNIVERSE (2018)

Add to Collection

Article Astronomy & Astrophysics

COLOSSUS: A Python Toolkit for Cosmology, Large-scale Structure, and Dark Matter Halos

Benedikt Diemer

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2018)

Add to Collection

Article Astronomy & Astrophysics

Cosmic Shear with Einstein Rings

Simon Birrer et al.

ASTROPHYSICAL JOURNAL LETTERS (2018)

Add to Collection

Article Astronomy & Astrophysics

Line-of-sight effects in strong lensing: putting theory into practice

Simon Birrer et al.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2017)

Add to Collection

Article Astronomy & Astrophysics

The elliptical power law profile lens

Nicolas Tessore et al.

ASTRONOMY & ASTROPHYSICS (2015)

Add to Collection

Article Astronomy & Astrophysics

The behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of Abell 3827

Richard Massey et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2015)

Add to Collection

Article Astronomy & Astrophysics

Adaptive semi-linear inversion of strong gravitational lens imaging

J. W. Nightingale et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2015)

Add to Collection

Article Astronomy & Astrophysics

The elliptical power law profile lens

Nicolas Tessore et al.

ASTRONOMY & ASTROPHYSICS (2015)

Add to Collection

Article Astronomy & Astrophysics

Source-position transformation: an approximate invariance in strong gravitational lensing

Peter Schneider et al.

ASTRONOMY & ASTROPHYSICS (2014)

Add to Collection

Article Astronomy & Astrophysics

Inference of the cold dark matter substructure mass function at z=0.2 using strong gravitational lenses

S. Vegetti et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2014)

Add to Collection

Article Astronomy & Astrophysics

A new hybrid framework to efficiently model lines of sight to gravitational lenses

Curtis McCully et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2014)

Add to Collection

Article Astronomy & Astrophysics

AN OFF-CENTER DENSITY PEAK IN THE MILKY WAY'S DARK MATTER HALO?

Michael Kuhlen et al.

ASTROPHYSICAL JOURNAL (2013)

Add to Collection

Article Astronomy & Astrophysics

emcee: The MCMC Hammer

Daniel Foreman-Mackey et al.

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC (2013)

Add to Collection

Article Astronomy & Astrophysics

THE HUBBLE SPACE TELESCOPE WIDE FIELD CAMERA 3 EARLY RELEASE SCIENCE DATA: PANCHROMATIC FAINT OBJECT COUNTS FOR 0.2-2 μm WAVELENGTH

Rogier A. Windhorst et al.

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2011)

Add to Collection

Article Astronomy & Astrophysics

Statistics of mass substructure from strong gravitational lensing: quantifying the mass fraction and mass function

Simona Vegetti et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2009)

Add to Collection

Article Astronomy & Astrophysics

TOWARD A HALO MASS FUNCTION FOR PRECISION COSMOLOGY: THE LIMITS OF UNIVERSALITY

Jeremy Tinker et al.

ASTROPHYSICAL JOURNAL (2008)

Add to Collection

Article Astronomy & Astrophysics

Weak gravitational flexion

DJ Bacon et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2006)

Add to Collection

© Peeref 2019-2024. All rights reserved.