El próximo martes 1 de julio, Francisco Urbina, de la Universidad de Chile, dictará el seminario “Dissecting the CGM: observational insights into the origin of PDLAs and simulated Arc-Tomography in TNG50” a las 11:00 horas en la Sala 208 del Instituto de Física, Campus Curauma, PUCV.
Compartimos el resumen de la presentación:
The gas reservoirs of galaxies and their interactions regulate galaxy evolution in a set of processes known as the baryon cycle. The venue where all these gas flows occur is known as the circumgalactic medium (CGM). Due to its diffuse nature, the CGM has been historically studied by means of QSO absorption spectra, providing only one line of sight per galaxy. This paradigm has radically changed in the last decade, where Integral Field Spectrographs in 8-10m class telescopes have been able to map the CGM both in emission, utilizing strong emission lines like Lyα, and in absorption, using giant gravitational arcs as background sources (technique known as gravitational-arc tomography). Taking advantage of this new transverse exploration of the diffuse gaseous environments of galaxies, the talk will focus on two fronts: first, using a compilation of PDLA-selected-QSOs observed with VLT/MUSE, characterize both the extended and compact Lyα emission, in order to constrain the origin of PDLAs and, thanks to the natural coronagraph offered by these proximate absorbers, to explore the inner regions of Lyα nebulae, offering some hints into the powering mechanism of Lyα nebulae. Second, utilizing TNG50 cosmological simulations, produce mock IFS-like absorption spectra to directly compare with the gravitational-arc tomography observations, studying the effect different spatial samplings have on different observables, comparing QSO and arc-tomography statistics, and computing the TNG50 cool CGM coherence length.
Extendemos la invitación a la comunidad del Instituto de Física y público interesado a participar de este seminario.
