[Physics-grads-open] [physics-grads-open] Physics & Astronomy Student Seminar (PASS), May 23rd at 4 pm, Phys 3027

[Ming-Feng Ho]

PASS will start in 1 hour. Today's speaker is Yongda Zhu (UCR). He will
talk about constraining reionization using hydrogen absorption lines.

Ming-Feng

On Fri, May 20, 2022 at 1:00 PM Ming-Feng Ho <mingfeng.ho at email.ucr.edu>
wrote:

> Hi all!
>
> We had a very fruitful PASS seminar last week. This week we have Yongda
> Zhu (4th year PhD) as our speaker for PASS:
>
> *Title: Probing Cosmic Reionization Using Hydrogen Absorption Lines*
>
> Yongda Zhu (University of California, Riverside)
>
> *Abstracts:* Reionization is the last major phase transition in the
> history of the Universe. During the epoch of reionization, which is widely
> believed to occur between roughly 150 million and one billion years after
> the Big Bang (redshift 20 ≳ z ≳ 6), neutral hydrogen in the intergalactic
> medium (IGM) was ionized by ultraviolet (UV) photons emitted by the first
> generations of stars and galaxies. The timing of reionization is therefore
> essential for us to understand the formation and evolution of the first
> galaxies.
> Large-scale fluctuations in IGM Lyman-alpha opacity at z < 6 suggest that
> reionization may have ended later than is normally assumed. Alternatively,
> the opacity fluctuations may be driven by variations in the ionizing UV
> background that reionization has ended. To resolve this dilemma, we can use
> hydrogen absorption lines in quasar spectra to probe the IGM during the
> reionization epoch. In this talk, I will present the novel investigations
> of the IGM over 5 < z < 6 using dark gaps in the Lyman-ɑ&Lyman-β forest. I
> will show our latest results and discuss the implications for reionization.
>
> Monday, May 23, 2022 at 4 pm
> Physics 3027 (Nebula Room)
>
> Details of the PASS program, please find here [Program
> <https://jibancat.github.io/ucr-student-seminars/program/index.html>].
>
> We have presenters scheduled until the end of the Spring Quarter (May 30
> Wei-Xiang Feng, June 6 Pak Kau Lim). And three more presenters (Mahdi
> Qezlou, Reza Monadi, and Elizabeth Finney) are queued in the Summer Quarter.
>
> To submit abstracts for Summer Quarter: [Abstract Submission
> <https://jibancat.github.io/ucr-student-seminars/registration/index.html>
> ].
>
> Hope to see you there!
> Ming-Feng
>
>
>
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