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...
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...
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...
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...
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...
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...
