Cosmic Dawn at High Latitudes Conference

Session

Session 6

27 Jun 2024, 09:45

Beijer auditorium (Swedish Royal Academy of Sciences)

150. JWST Constraints on Early Galaxy Formation and AGN Activity at z=4-14

Yuichi Harikane

27/06/2024, 09:45

We present number densities and physical properties of galaxies spectroscopically confirmed with JWST up to z~14. The UV luminosity functions determined with the spectroscopic galaxy sample are consistent with the photometric results from previous studies, and show a tension with most of the theoretical model predictions. We will discuss several possibilities that can explain the observed...

39. Anatomy of an ionized bubble: NIRcam Grism spectroscopy of z=6.6 double-peaked Lyman-alpha emitter COLA1 and its environment

Alberto Torralba-Torregrosa (UV)

27/06/2024, 10:15

There is an ongoing debate of whether bright or faint galaxies reionized the Universe. In this context, the galaxy COLA1 - a luminous rare double peaked Lyman-$\alpha$ (Ly$\alpha$) emitter in the COSMOS field at a redshift $z=6.6$ - provides an exceptional opportunity to unveil the anatomy of an ionized bubble in detail. The visibility of the blue peak of the Ly$\alpha$ line suggests that...

92. Stellar and AGN Feedback Probed with Outflows in JWST Galaxies at z=3-9: Implications of More Frequent and Spherical Galactic Fountains

Yi Xu (The University of Tokyo)

27/06/2024, 10:30

We study outflows in 130 galaxies with 16<M_UV<-22 at z=3-9 identified in JWST spectroscopic data taken by the CEERS, ERO, FRESCO, GLASS, and JADES programs. We identify 30 out of the 130 galaxies with broad components of FWHM ~150-800 km/s in the emission lines of Hα and [OIII]5007 that trace ionized outflows. Four out of the 30 outflowing galaxies are Type 1 AGNs whose Hα emission lines...

108. The emergence of high-redshift dusty galaxies in the Obelisk simulation

Maxime Trebitsch (Kapteyn Astronomical Institute)

27/06/2024, 10:45

The new generation of facilities such as the JWST has opened a new window on the high-redshift Universe. One of the key early results of these recent observations, confirming the findings of large ALMA surveys such as REBELS or ALPINE, is the presence of dust in galaxies already early in the history of the Universe.
In the context of the Epoch of Reionisation, this raises two questions: can...

127. The Inhomogeneous Rise of Metallicity During the Epoch of Reionization

Joohyun Lee (UT Austin)

27/06/2024, 11:00

When galaxies and stars began to form, they released ionizing radiation into the intergalactic medium which resulted in its reionization over the course of the first billion years. This ionizing radiation was dominated by massive stars. Reionization was inhomogeneous in space and time, reflecting the clustering of galaxies, and the inhomogeneous density field into which their radiation caused...

114. Unbiased UV continuum slopes at z=6.5-13 from combined PEARLS GTO and public JWST NIRCam imaging

Duncan Austin (University of Manchester)

27/06/2024, 11:45

In this talk, I will present UV continuum properties from the EPOCHS sample of 1011 high-redshift galaxies spanning z=6.5-13 across 179 square arcmin of public and PEARLS GTO NIRCam imaging from JWST Cycle 1. I will show the bias corrected UV beta-MUV relation, from which I find that the MUV=-19 galaxy population becomes extremely blue at z>11. We find that 68 of these candidates are robust...

119. The Power of Local Analogues in Understanding the ISM Conditions of High-z Galaxies

Bethan James (STScI)

27/06/2024, 12:00

Rest-frame UV spectra play a key role in the understanding of massive stellar populations, chemical evolution, feedback processes, and reionization. In particular, in the current JWST era, the UV spectroscopic frontier has been pushed to higher redshifts than ever before, to finally reveal the first galaxies in the distant Universe. It is thus fundamental to understand the diagnostic power of...

87. The Resolved Dust and Interstellar Medium of a z=7.31 Rotating Disk

Hiddo Algera (Hiroshima University)

27/06/2024, 12:15

Over the last decade, ALMA has revolutionized our understanding of the interstellar medium (ISM) conditions of distant galaxies. For one, ALMA has now detected (sub-)millimeter continuum emission from dozens of galaxies at $z > 6.5$, establishing the importance of dust-obscured star formation already within the first 800 Myr after the Big Bang. Moreover, through various bright emission line...

79. Constraining galaxy close pair fractions and merger rates from Cosmic Noon to Cosmic Dawn using deep JWST observations

David Puskas (Kavli Institute for Cosmology, University of Cambridge)

27/06/2024, 12:30

Galaxy mergers play a crucial role in the mass build-up and evolution of galaxies according to hierarchical structure formation and cosmological simulations. I will present the most extensive study of major galaxy mergers (with a stellar mass ratio of 1:4) to date, covering the yet poorly understood and mainly unexplored redshift range of z ∼ 2−10. I use the NIRCam imaging and NIRSpec...