Concept
Superamas de galaxies
Publications associées (32)
Hydrodynamical simulations of merging galaxy clusters: giant dark matter particle colliders, powered by gravity
David Richard Harvey, Richard Massey
Terrestrial particle accelerators collide charged particles, then watch the trajectory of outgoing debris - but they cannot manipulate dark matter. Fortunately, dark matter is the main component of galaxy clusters, which are continuously pulled together by ...
Oxford Univ Press2024GHOST commissioning science results - II: a very metal-poor star witnessing the early galactic assembly
This study focuses on Pristine_180956.78-294759.8 (hereafter P180956, [Fe/H] = -1.95 +/- 0.02), a star selected from the Pristine Inner Galaxy Survey (PIGS), and followed-up with the recently commissioned Gemini High-resolution Optical SpecTrograph (GHOST) ...
Oxford2024Limit on the intergalactic magnetic field from the ultrahigh-energy cosmic ray hotspot in the Perseus-Pisces region
The Telescope Array Collaboration has reported an evidence for existence of a source of ultrahigh energy cosmic ray events in Perseus-Pisces supercluster. We show that the mere existence of such a source imposes an upper bound on the strength of intergalac ...
College Pk2023Cosmic void exclusion models and their impact on the distance scale measurements from large-scale structure
Jean-Paul Richard Kneib, Andrei Variu, Daniel Felipe Forero Sanchez, Cheng Zhao, Amélie Tamone
Baryonic Acoustic Oscillations (BAOs) studies based on the clustering of voids and matter tracers provide important constraints on cosmological parameters related to the expansion of the Universe. However, modelling the void exclusion effect is an importan ...
OXFORD UNIV PRESS2023Probing the nature of Dark Energy through the study of large scale structures using spectroscopic surveys and their simulations
Measurements of large-scale structure (LSS), as performed on the largest 3D map of over two million extragalactic sources from the Sloan Digital Sky Survey, together with measurements of the cosmic microwave background (CMB) anisotropies, are in complete a ...
EPFL2023Virgo Filaments. II. Catalog and First Results on the Effect of Filaments on Galaxy Properties
Pascale Jablonka, Gianluca Castignani
Virgo is the nearest galaxy cluster; it is thus ideal for studies of galaxy evolution in dense environments in the local universe. It is embedded in a complex filamentary network of galaxies and groups, which represents the skeleton of the large-scale Lani ...
IOP Publishing Ltd2022Cosmic void baryon acoustic oscillation measurement: evaluation of sensitivity to selection effects
Jean-Paul Richard Kneib, Andrei Variu, Daniel Felipe Forero Sanchez, Cheng Zhao, Amélie Tamone
Cosmic voids defined as a subset of Delaunay triangulation (DT) circumspheres have been used to measure the baryon acoustic oscillations (BAO) scale; providing tighter constraints on cosmological parameters when combined with matter tracers. These voids ar ...
OXFORD UNIV PRESS2022Dark matter in galaxy clusters: Parametric strong-lensing approach
Benjamin Emmanuel Nicolas Beauchesne
We present a parametric strong-lensing analysis of three massive galaxy clusters for which Hubble Space Telescope imaging is available, as well as spectroscopy of multiply imaged systems and galaxy cluster members. Our aim is to probe the inner shape of da ...
EDP SCIENCES S A2022Metallicity Distribution Function of the Eridanus II Ultra-faint Dwarf Galaxy from Hubble Space Telescope Narrowband Imaging
Nicolas Lawrence Etienne Longeard
We use deep narrowband CaHK (F395N) imaging taken with the Hubble Space Telescope (HST) to construct the metallicity distribution function (MDF) of Local Group ultra-faint dwarf galaxy Eridanus II (Eri II). When combined with archival F475W and F814W data, ...
IOP Publishing Ltd2022Virgo filaments I. Processing of gas in cosmological filaments around the Virgo cluster
Pascale Jablonka, Gianluca Castignani
It is now well established that galaxies have different morphologies, gas contents, and star formation rates (SFR) in dense environments like galaxy clusters. The impact of environmental density extends to several virial radii, and galaxies appear to be pr ...
EDP SCIENCES S A2021