HAL-ENS-LYON
Not a member yet
104280 research outputs found
Sort by
JWST + ALMA ubiquitously discover companion systems within ≲18 kpc around four z ≈ 3.5 luminous radio-loud AGN
No full textInternational audienceMergers play important roles in galaxy evolution at and beyond cosmic noon ( z ∼ 3). They have been found to be a trigger of active galactic nuclei (AGN) activity and a process for growing stellar mass and black hole mass. High- z radio galaxies (HzRGs = type-2 radio-loud AGN) are among the most massive galaxies known, and they reside in dense environments on scales of tens of kiloparsecs to Megaparsecs. We present the first search for kiloparsec-scale companions using matched 0.2″ resolution ALMA and JWST/NIRSpec integral field unit data in a sample of four z ∼ 3.5 HzRGs with many supporting datasets. We discovered a total of ∼12 companion systems within ≲18 kpc across all four HzRG fields using two independent detection methods: peculiar [O III ]4959, 5007 kinematics offset from the main (systemic) ionized gas component and [C II ]158 μm emitters. We examined the velocity fields of these companions and find evidence of disk rotation along with more complex motions. We estimate the dynamical masses of these nearby systems to be M dyn ∼ 10 9 − 11 M ⊙ , which may indicate a minor merger scenario. Our results indicate that these companions may be the trigger of the powerful radio-loud AGN. We discuss the roles of the discovered companion systems in galaxy evolution for these powerful jetted AGN and indicate that they may impede jet launch and deflect the jet
The snake in the Brownian sphere
No full textInternational audienceThe Brownian sphere is a random metric space, homeomorphic to the two-dimensional sphere, which arises as the universal scaling limit of many types of random planar maps. The direct construction of the Brownian sphere is via a continuous analogue of the Cori--Vauquelin--Schaeffer (CVS) bijection. The CVS bijection maps labeled trees to planar maps, and the continuous version maps Aldous' continuum random tree with Brownian labels (the Brownian snake) to the Brownian sphere. In this work, we describe the inverse of the continuous CVS bijection, by constructing the Brownian snake as a measurable function of the Brownian sphere. Special care is needed to work with the orientation of the Brownian sphere
Adeline Grand-Clément, Au plaisir des dieux. Expériences du sensible dans les rituels en Grèce ancienne, Toulouse, Anacharsis, 2023, 409 p.
No full textInternational audienc
"Corinthe/Manhattan aller-et-retour. Écrire, interpréter, représenter Médée"
No full textInternational audienceAbstract: The story of Medea, an infanticidal mother and regicidal sorceress, an unrepresentable subject that catalyzes the challenges and issues specific to tragedy, has been widely exploited by playwrights and theater theorists alike. Dea Loher’s approach is part of a proven tradition of creative rewriting. This article proposes to reverse the chronology and start from Manhattan Medea to read Seneca’s Medea differently, hoping, thanks to this highly reflective material, to revise our understanding of tragedy.Resumen: La historia de Medea, madre infanticida y hechicera regicida, un sujeto irrepresentable que cataliza los desafíos y problemas propios de la tragedia, ha sido ampliamente explotada tanto por dramaturgos como por teóricos del teatro. El enfoque de Dea Loher forma parte de una tradición consolidada de reescritura creativa. Este artículo propone invertir la cronología y partir de Manhattan Medea para leer la Medea de Séneca de una manera diferente, con la esperanza, gracias a este material altamente reflexivo, de revisar nuestra comprensión de la tragedia.Résumé : L’histoire de Médée, mère infanticide et magicienne régicide, sujet irreprésentable mais catalysant les défis et les enjeux propres à la tragédie, a été abondamment exploitée par les dramaturges comme par les théoriciens du théâtre. La démarche de Dea Loher s’inscrit dans une tradition de réécriture créatrice éprouvée. L’article propose de renverser la chronologie et de partir de Manhattan Medea pour lire autrement Médée de Sénèque en espérant, grâce à cette matière hautement réflexive, réviser notre compréhension de la tragédie
Generic motives and motivic cohomology of fields
No full textInternational audienceThis paper investigates the structure of generic motives and their implications for the motivic cohomology of fields. Originating in Voevodsky's theory of motives and related to Beilinson's vision of a motivic t-structure, generic motives serve as pro-objects encoding essential information about cycles and cohomology. We present new computations of generic motives, focusing on curves and surfaces. These computations suggest a conjectural framework for morphisms of generic motives and highlight the central role of transcendental motives.We then focus on the motivic cohomology of fields, building on Borel's rank computation of K-theory and its relation to higher regulators. We provide a direct argument for determining the weights in the λ-structure of the K-theory of number fields, bypassing the need for regulator maps. We show that motivic cohomology groups are often of infinite rank, typically matching the cardinality of the base field. For instance, we prove that motivic cohomology groups of R and C are uncountable in many bi-degrees. Despite this, we propose a conjecture that complements the Beilinson-Soulé vanishing conjecture, suggesting that the growth of motivic cohomology is more controlled than these results may initially indicate.This paper is dedicated to the memory of Jacob Murre.</p
« Quelques remarques sur l’ouvrage La théorie féministe au défi du handicap. Recueil de textes des feminist disability studies, C. Bouchet, M. Boudinet, M. Koushyar Soucasse et G. Larrieu éd., avec le soutien du collectif Les Dévalideuses, Paris, Cambourakis, 2025 »
No full textNational audienc
La carrière d'un établissement de bains-douches à Valence. Une histoire de combinaisons public/privé au XXe siècle
No full textInternational audienc
Se poser : L’aspiration à l’installation conjugale des filles des classes populaires rurales.
No full textInternational audienceCet article cherche à comprendre l’attractivité paradoxale du couple pour de jeunes femmes de classes populaires rurales. Il repose sur une enquête ethnographique et sur l’exploitation de l’Enquête nationale sur les ressources des jeunes (ENRJ 2014, Drees, Insee). Après avoir montré la précocité de la vie en ménage pour les jeunes femmes d’origine rurale et populaire, variable selon les fractions de classes, il cherche à mettre en évidence les logiques sociales qui poussent localement certaines jeunes femmes à « se poser » précocement en couple en dépit des coûts de la conjugalité. Le couple offre des ressources matérielles et statutaires plus ou moins précieuses pour ces filles, qui ne sont pas sans ressource pour négocier l’ordre conjugal. La séparation reste aussi dans l’ordre des possibles et marque une évolution des modèles genrés d’entrée dans la vie adulte au sein des classes populaires
The Spectral Edge of Constant Degree Erdős–Rényi Graphs
No full textInternational audienceWe show that for an Erdős–Rényi graph on vertices with expected degree satisfying , the largest eigenvalues can be precisely determined by small neighborhoods around vertices of close to maximal degree. Moreover, under the added condition that , the corresponding eigenvectors are localized, in that the mass of the eigenvector decays exponentially away from the high degree vertex. This dependence on local neighborhoods implies that the edge eigenvalues converge to a Poisson point process. These theorems extend a result of Alt, Ducatez, and Knowles, who showed the same behavior for satisfying and answer a question of Guionnet. To achieve high accuracy in the constant degree regime, instead of comparing the true eigenvector to that of a tree with more regularity, we examine the eigenvector equation at each vertex in a ball to deduce localization of the eigenvector and derive a continued fraction formula for the eigenvalue. This formula can be applied to any tree and could be of independent interest, especially for rooted trees with large central degree