[Astro] [CAPT] Seminar 12/3: Sunny Cheng

[Jesse Golden-Marx]

Hi Everyone,
      I just wanted to remind you all about our seminar today from Sunny!  We'll be starting at 4pm (after the poster session) in C4.

Also, if anyone else wants to join for lunch (meeting in the lobby to go to Lakeside Arts at 1pm) just let me know.

See you all later today!

In peace,
Jesse
________________________________
From: Jesse Golden-Marx (staff) <ppzjbg at exmail.nottingham.ac.uk>
Sent: Monday, March 10, 2025 12:34 PM
To: capt at nottingham.ac.uk <capt at nottingham.ac.uk>
Subject: Re: Seminar 12/3: Sunny Cheng

Hi Everyone,
      One minor change to this week's seminar.  Since there is the Physics department poster session this week, we will be starting our seminar at 16:00 following the poster session in C4 on Wednesday, followed by Wine and Cheese as usual.  That way everyone can participate in both the poster session and get to hear Sunny's seminar.

We will likely also adjust the time of the meeting with the postgraduates, but that time has not been finalized yet.

Cheers,
Jesse and Luke
________________________________
From: Jesse Golden-Marx (staff)
Sent: Monday, March 10, 2025 10:56 AM
To: capt at nottingham.ac.uk <capt at nottingham.ac.uk>
Subject: Seminar 12/3: Sunny Cheng

Hi Everyone,
      Our speaker for this week's seminar is Dr. Ting-Yun (Sunny) Cheng from Durham.  Many of you likely know Sunny from when she did her PhD here working with Alfonso and Chris Conselice.  Sunny is an expert on galaxy formation and morphology and machine learning.  The abstract and title for her talk are provided below.

Sunny will be arriving around 11:30am on Wednesday and visiting the department on both Wednesday and Thursday.  We'll be having lunch with Sunny at 1pm at Lakeside Arts as part of the seminar on Wednesday.  If you're interested in joining us, please let me know by tomorrow night.  As usual, we can subsidize a few postgraduate students.

Sunny will be sitting in A108 (at Luke's desk) while she's visiting.  So, if you're interested in meeting with her, either let me know or come stop by the office.

Kind regards,
Jesse


Title:

Needles in Haystacks: Searching for Rare Primordial Systems with Deep Learning

Abstract:

Primordial systems are unique archeological sites, commonly hidden within vast observational datasets yet offering invaluable insights into the story of our Universe. In this talk, I will present efforts in searching for two kinds of (potentially) primordial systems — (1) low-metallicity dwarf galaxies and (2) Lyman limit deuterium systems — using deep learning techniques.

Extremely metal-poor dwarf galaxies (XMPs) are often regarded as the “living fossils” of the earliest galaxies. These relics in the local Universe are ideal laboratories for studying the environmental conditions and chemical enrichment processes of early galaxies, as well as their impact on the evolution of early Universe. However, these systems are exceedingly rare; despite extensive searches over the past two decades, only a few hundred have been identified among millions of galaxy samples. This talk will present my recent work on developing an effective deep learning pipeline for identifying XMPs and report some exciting new discoveries from our ongoing search.

The second part of the talk will introduce the search for Lyman limit deuterium systems in the Lyman-alpha forest of quasar spectra. Deuterium, primarily produced during Big Bang nucleosynthesis, has been largely consumed by stellar processes, making these systems rare and invaluable tracers for understanding the early Universe. In particular, Lyman limit deuterium systems are even rarer, with only three well-known systems in literature. I will present newly discovered systems from this search and our investigation of the temperature-density relation in these systems.






Jesse Golden-Marx, Ph.D.
Senior Research Associate

Centre for Astronomy & Particle Theory
School of Physics & Astronomy
University of Nottingham
University Park, Nottingham, UK
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