Saba Etezadrazavi

Department of Physics, Sharif University of Technology

Constraining temperature fluctuations in IGM using XQ-100 legacy survey 

Abstract:  Arriving at the peak of Quasar activities, the UV background emitted by the Quasars forced the IGM to experience another re-ionization phase after the hydrogen re-ionization, namely the Helium re-ionization epoch. Investigating this epoch is a crucial step toward understanding the relationship between quasars and their environment as one of the most active cosmological mediums. The XQ-100 legacy survey by VLT X-shooter had provided us with one of the highest resolution Quasar surveys at high redshifts. Armed with this spectroscopic Quasar data and newly developed PCA methods, we can recover the Quasar’s un-absorbed spectrum knowing all the error’s sources and quantify IGM’s thermodynamical quantities around the Helium-reionization epoch. Knowing the IGM absorptions and our error model, for the first time, we are able to constrain temperature fluctuations resulting from the Helium re-ionization observationally that can be used to rule out some of the known re-ionization models.

یکشنبه  9 آبان 1400، ساعت 15:00

Sunday 31 October 2021 – 15:00 Tehran Time

اتاق سمینار مجازی –Virtual Seminar Room

https://vc.sharif.edu/ch/cosmology

گزینه ورود به صورت مهمان – Enter as a Guest