The production and escape of Lyman photons through time and space (14/01/22)

Welcome! Here you will find information about our RAS Specialist Discussion on the production and escape of Lyman photons throughout time and space to take place virtually on 14 January 2022. Register here (abstract submission deadline was Dec 3rd 2021).

Confirmed invited speakers: Anne Jaskot (Williams College, USA); Matthew Hayes (Stockholm University, Sweden), Jeremy Blaizot (Lyon, France)

Organisers: David Sobral (Lancaster, UK); Sangeeta Malhotra (NASA); Jorryt Matthee (ETH Zurich); Taylor Hutchison (Texas A&M)

The production and escape of ionising Lyman continuum (LyC; <912 Å) and resonant Lyman-α (Lyα; 1216 Å) photons in and from galaxies at different cosmic epochs (z~0-10) remain key uncertainties in galaxy formation and evolution and on the epoch of re-ionisation. In this on-line meeting we aim to foster a discussion session focused on getting most out of current and future observations and simulations of the Lyα line in distant galaxies. We also aim to further unveil and explore its connection with LyC photons with unique applications into the epoch of re-ionisation. These are all incredibly timely topics, particularly with the launch of ​JWST.​

This specialist discussion session aims to stimulate an holistic approach over​:

✦ The relation between Lyα and detailed gas properties observed at low-z;
✦ The production and escape of Lyα and LyC photons in analogues and at high-z;
✦ The stellar populations in Lyα emitters and low mass galaxies;
✦ What simulations are telling us and what we need to solve;
✦ The Lyα-LyC connection: causes and consequences;
✦ Lyα and reionization.

Save the date: 14 January 2022 and register here.

What to look out for:

✦ Discussions on slack will kick-start at least 1 week before the discussion session to obtain the opinion of participants and to drive (in advance) some of the science discussions. The webpage of the meeting will share further information.
✦ Participants are encouraged to share papers relevant to the discussion and contribute on slack and also to introduce themselves there (e.g. ECRs)
✦ Poster presenters will be able to post their posters and short videos (1-2 min) 1 week in advance and start taking questions + discuss their work.

Updated program (09/01/2022):

UTC/GMT (UK time)Speaker (Institute)Talk Title
10:05Matthew Hayes (Stockholm)The cosmic evolution of the Lyman-alpha and continuum output of galaxies [Invited talk]
10:25Fergus Cullen (Edinburgh)Investigating the relationship between stellar metallicity and Lya escape at z=3.5
10:40Adélaïde Claeyssens (Stockholm)The Lensed Lyman-Alpha MUSE Arcs Sample (LLAMAS) : Morphological properties of faint high redshift Lyman-alpha emitters
10:55Siddhartha Gurung Lopez (Valencia)zELDA: fitting Lyman-alpha line profiles using deep learning.
11:10Rui Marques-Chaves (Geneva)UV-luminous starbursts and strong LyC emitters
11:25Coffee Break + discussion (15 min)
11:40Alberto Saldana-Lopez (Geneva)Unveiling the ISM properties of low-z Lyman Continuum emitters
11:55Mengtao Tang (UCL)Lyman-Alpha Spectroscopy of Extreme [OIII] Emitting Galaxies at z ~ 2 – 3: Implications for Lyman-Alpha Visibility and LyC Leakage at z > 6
12:10Ryan Begley (Edinburgh)The Lyman Continuum escape fraction of z~3.5 VANDELS galaxies
12:25Mauro Stefanon (Leiden)The Lyman continuum photon production efficiency from Halpha measurements at z~8
12:40Haruka Kusakabe (Geneva)Significant amount of hydrogen in the CGM around UV-selected galaxies at z=3-4 traced by Lya haloes
12:55Brianna Thomas (Washington)Characterizing Extended Lyman-Alpha Emission in the HETDEX Survey
Lunch break (50 min)
14:00Jeremy Blaizot (Lyon)Production and escape of Lyman photons from galaxies: an overview of recent developments from the simulation side [invited talk]
14:20Eloïse Vitte (Geneva)Double-peaked Lyman-alpha emitters (LAEs) seen with VLT/MUSE
14:35Thibault Garel (Geneva)Lyman-alpha as a tracer of cosmic reionisation in the SPHINX radiation-hydrodynamics cosmological simulation
14:50Rohan Naidu (Harvard)Solving Reionization with Resolved Lyman-alpha
15:05Romain Meyer (MPIA)Measuring the contribution of z~6 galaxies to reionisation with galaxy-IGM cross-correlations
15:20Zhihui Li (Caltech)Deciphering the Lyman-alpha Emission Line: Towards the Understanding of Galactic Properties Extracted from Lyman-alpha Spectra via Radiative Transfer Modeling
15:35Santosh Harish (Arizona)New spectroscopic confirmations of LAEs at z~7 from LAGER
15:50Coffee Break + Discussion (15 min)
16:05Anne Jaskot (Williams College)The HST Low-Redshift Lyman Continuum Survey: A Guide to Finding LyC Emitters Near You [invited talk]
16:25Grace Telford (Rutgers)Extremely Metal-Poor O Stars in Nearby Galaxies as Analogs of Ionizing Photon Producers in the Early Universe
16:40Keunho J. Kim (Cincinnati)Shaping LyA Escape: detailed morphology analysis of Green Pea galaxies using high-resolution UV images
16:55Xinfeng Xu (John Hopkins)Tracing LyA and LyC Escape from MgII Emission Lines
17:10Final remarks

Key dates/timeline:

06/05/21: First announcement and pre-registration opens.

07/11/21: Registration + abstract submission opens. Register here.

03/12/21: Abstract deadline. Anonymous abstract review starts.

17/12/21: Preliminary program released.

05/01/22: Slack space opens: discussions start.

14/01/22: LymanRAS on Zoom.