I Simposio de Postgrado 2023. Ingeniería, ciencias e innovación

MÓDULO_ 01 Astronomía y Física 40 HUNTING Ly- α NEBULAE IN PROXIMATE ABSORPTION SYSTEMS Francisco Urbina 1 *, Trystyn Berg 2 , Sebastián López 1 , Fuyan Bian 3 1 Departamento de Astronomía, Universidad de Chile. 2 Departamento Física, Universidad deMilano-Bicocca 3 EuropeanSouthernObservatory *Email: francisco.urbina@uchile.cl ABSTRACT Quasars are one of the most luminous and energetic objects in our universe, which is usually attributed to the presence of a supermassive black hole in its center that is actively accreting matter. In their surroundings, it is usually found nebulae with typical sizes of 5 times the Milky Way. These giants of gas can be directly detected by the hydrogen emission of UV photons, usually known as Ly-α emission. By studying these nebulae, we can trace the cold and ionized medium around quasars. The powering mechanism of the Ly-α nebula is still uncertain, but a strong enough source of high-energy photons is needed for them to exist, likely related to the central quasar. The present work aims to understand their properties when the central quasars have proximate and very dense pockets of gas in front of them, known as proximate damped Ly-α systems (PDLA), that block almost all the light coming from the quasar. By studying these systems, we have the unique opportunity to test the current theories about the powering mechanisms and try to understand what role the PDLA system has in these environments. For example, are they related to thenebulaor toneighboringgalaxies? We used an observational technique known as Integral Field Spectroscopy (IFU) that allows to get a spectrum for every pixel in the image. The observations were taken with the Very Large TelescopeandthreedifferentquasarfieldswithPDLAsystemswere targeted fromwhich three different Ly-α nebulae were detected all showing different morphologies and kinematic features.