Cosmic Dawn at High Latitudes Conference

Session

Session 9

28 Jun 2024, 13:15

Beijer auditorium (Swedish Royal Academy of Sciences)

151. Observational Benchmarks of Early Galaxy Evolution from Extreme Emission Line Galaxies

Danielle Berg

28/06/2024, 13:15

28. Probing stellar feedback and ionising escape with accurate emission line modelling

Will McClymont (University of Cambridge)

28/06/2024, 13:45

JWST has provided an abundance of spectroscopic and photometric data during the Epoch of Reionisation and beyond. However, understanding the underlying physics of galaxies during these early epochs remains a formidable challenge as we rely on biased observational methodologies such as SED fitting to interpret the data and compare to simulations. I will present results from zoom-in...

42. Deciphering Lyman Escape in Anisotropic Gas Configurations

Silvia Almada Monter (Max Planck for Astrophysics)

28/06/2024, 14:00

With the James Web Telescope (JWST) offering a prime opportunity to observe Lyman-alpha (Lya) in the high-redshift Universe, understanding the information embedded in Lya observables and its relation to ionizing radiation has become a crucial task in the study of the Epoch of Reionization. Since Lya is sensitive to gas density, dust, and fragmentation, it provides vital information about the...

65. Mapping the Influence of Cool Outflows on LyC Escape in High Redshift Analogs

Cody Carr (Zhejiang University)

28/06/2024, 14:15

Constraining the Lyman continuum (LyC) escape fraction, fesc, at high redshifts is essential for mapping the ionizing emissivity of early galaxies during Reionization, but attenuation by the neutral IGM renders direct measurements impossible.  As such, various diagnostics, such as [OIII]/[OII] ratios, UV-slope, etc., have been studied in local high-redshift analogs to develop techniques to...

135. Escape the Block: Mapping pathways of ionizing leakage at in high detail with JWST

T. Emil Rivera-Thorsen (Stockholm University)

28/06/2024, 14:30

Recent years have seen mounting evidence that the dominant contribution of
Lyman-Continuum photons driving cosmic Reionization has come from hot, massive stars in the first galaxies. How these photons have escaped the shroud of HI in their galaxies of origin to ionize the IGM is still debated and studied intensely. Many mechanisms have been suggested that can create the necessary escape...

115. Stacking PANCAKEZ: sPectroscopic Analysis with NirspeC stAcKs in the Epoch of reioniZation

Kelsey Glazer (University of California, Davis)

28/06/2024, 15:15

Young star-forming galaxies are believed to be the main contributors to the process of cosmic reionization which completed roughly $1$ billion years after the big bang, at a redshift $z\sim6$. However, it is unclear whether such galaxies actually had sufficient ionizing escape fractions, as direct measurements are impossible due to the neutral intergalactic medium at this epoch. Indirect...

111. Inferring the Distribution of the Ionising Photon Escape Fraction

Kimi Cardoso Kreilgaard (The Cosmic Dawn Center, Niels Bohr Institute, University of Copenhagen)

28/06/2024, 15:30

The reionisation of the IGM was driven by the first galaxies. However, the nature of these galaxies remains uncertain. This includes how many stars form in a galaxy, what types of stars form and what fraction of the ionising photons produced in the galaxy escape into the IGM. In particular, the ionising photon escape fraction is poorly constrained observationally and we lack a clear picture...

13. Physical properties of extreme emission-line galaxies at z~4-9 from the JWST CEERS survey

Mario Llerena (INAF-OAR)

28/06/2024, 15:45

Extreme emission line galaxies (EELGs) are typically characterized by high equivalent widths (EWs) which are driven by elevated specific star formation rates (sSFR) in low-mass galaxies with subsolar metallicities and little dust. Such extreme systems are exceedingly rare in the local universe, but the number density of EELGs increases with redshift. Such starburst galaxies are currently...

158. Discussion and closing remarks

Danielle Berg, Organizers

28/06/2024, 16:00

38. MOSEL Survey: Extreme Emission Lines as Probes of the Epoch of Reionisation Era

Anshu Gupta (Curtin university)

Recent JWST observations have revealed that extreme emission line galaxies (EELGs) are ubiquitous in the early universe. The extreme emission feature is linked to the rising star formation history, but it’s unclear if direct gas accretion or mergers are driving the burst of star formation. In this talk, I will discuss properties of EELGs at $2.5<z<4$ and how they can inform our understanding...

137. Relating Low-Ionization Metal Absorption to the Neutral ISM in CLASSY Galaxies

Kaelee Parker

Rest-frame far-ultraviolet (FUV) observations from JWST are currently revolutionizing our understanding of the high-z galaxies that drove reionization and the mechanisms by which they accomplished it. In order to fully interpret these new observations, we must be able to carefully diagnose how properties of the neutral interstellar medium (e.g., column density, covering fraction, outflow...