Clumpy Disc and Bulge Formation

We present a set of hydrodynamical/Nbody controlled simulations of isolated gas rich galaxies that self-consistently include SN feedback and a detailed chemical evolution model, both tested in cosmological simulations. The initial conditions are motivated by the observed star forming galaxies at z ~ 2-3. We find that the presence of a multiphase interstellar media in our models promotes the growth of disc instability favouring the formation of clumps which in general, are not easily disrupted on timescales compared to the migration time. We show that stellar clumps migrate towards the central region and contribute to form a classical-like bulge with a Sersic index, n > 2. Our physically-motivated Supernova feedback has a mild influence on clump survival and evolution, partially limiting the mass growth of clumps as the energy released per Supernova event is increased, with the consequent flattening of the bulge profile. This regulation does not prevent the building of a classical-like bulge even for the most energetic feedback tested. Our Supernova feedback model is able to establish a self-regulated star formation, producing mass-loaded outflows and stellar age spreads comparable to observations. We find that the bulge formation by clumps may coexit with other channels of bulge assembly such as bar and mergers. Our results suggest that galactic bulges could be interpreted as composite systems with structural components and stellar populations storing archaeological information of the dynamical history of their galaxy.Comment: Accepted for publication in MNRAS - Aug. 20, 201

Performativity, devices, and politics. Fuerzas especiales by Diamela Eltit

Indexación: Scopus; Scielo.Este artículo propone una lectura de la novela Fuerzas especiales de Diamela Eltit, la cual configura una retórica visual o de una letra en tránsito hacia la imagen desde una interpretación ranceriana de lo político. Sobre esta base, se busca desarrollar dos objetivos: el primero, articular una lectura en torno a las nociones de política, en cuanto todo cruce entre letra, medios, imágenes y dispositivos implica un choque y una fricción, que siempre cargan con otras tensiones políticas y culturales; el segundo, analizar las variantes que posibilitan hablar de una retórica del espectáculo, la escena y la imagen.This article proposes a reading of the novel Fuerzas especiales, by Diamela Eltit, which configures a visual rethoric or from the written letter in transit towards image, from a Rancierian reading of the political. On this basis, two objectives are sought: first, articulating a reading around the notions of politics, considering that every crossover between writing, media, images and devices implies clash and friction, which always bring other cultural and political tensions; the second, analyzing the variants that enable talking about a performance, scene and image rethoric.https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-5811201800010004