报告题目：Illuminating the Cosmic Web and the Circumgalactic Medium with the help of quasars

报  告 人： Sebastiano Cantalupo 教授（University of Milan Bicocca）

报告人简介：http://cosmib.org/cantalupo/

报告摘要：Our standard cosmological model predicts that most of the matter in the universe is distributed into a network of filaments - the Cosmic Web - in which galaxies form and evolve. Because most of this material is too diffuse to form stars,its direct detection in emission has remained elusive for several decades leaving fundamental questions still open,including: How are galaxies linked to each other?What are the morphological,physical and kinematical properties of the Cosmic Web and Circumgalactic gas on both large and small scales?How do they affect galaxy formation and evolution?During the last few years we have been able to start addressing these questions in a completely new way: i.e.,by directly detecting intergalactic gas in emission thanks to “cosmic flashlights” such as quasars which can ionise and thus light-up through fluorescent emission cosmic gas over large volumes. Recent surveys exploiting the capabilities of new instruments such MUSE and KCWI are now providing a large statistical sample of three-dimensional images of rest-frame-UV line emission from “cold” gas haloes (and sometimes filaments) around galaxies,which are ubiquitously detected in the surrounding of quasars at all explored redshifts (2<z<6.5). In this talk,I will review these exciting results and discuss how they can provide new learning opportunities for our understanding of the physical properties of gas around massive galaxies and high-redshift galaxy formation. In particular,I will present ongoing deep and wide follow-up studies on some quasar fields which are revealing the Cosmic Web distribution on Mpc-scales and discuss how these  multi-wavelength surveys using ALMA,JWST,Chandra,HST and ground-based imaging are opening up a new window on the study of galaxy and structure formation.

报告时间：2024年4月16日星期二9:00

报告地点：紫台3号楼302会议室

欢迎大家参加！