Oral Presentation

Unveiling Dusty Galaxies in the Epoch of Reionization with REBELS

Author(s): Hiddo Algera (Hiroshima University) Hanae Inami (Hiroshima University) and the REBELS team

Presenter: Hiddo Algera (Hiroshima University)

The evolution of galaxies within the first billion years after the Big Bang has by and large only been studied at ultraviolet and optical wavelengths. Since the advent of ALMA, however, a handful of galaxies at z > 7 have been observed to contain significant amounts of dust, demonstrating that a far-infrared view of distant galaxies is crucial to understand their growth and evolution. The ongoing ALMA Large Program REBELS — the Reionization Era Bright Emission Line Survey — was designed to probe both the interstellar medium conditions and dust emission in 40 UV-selected galaxies at z ~ 7 - 8. Through ALMA spectral scans of the bright [CII] line, REBELS thereby simultaneously provides the first statistical samples of [CII]-emitting and dusty galaxies in the early Universe. In this talk, I will introduce the REBELS survey and discuss in detail the dust properties of the observed galaxy sample in the context of galaxy evolution. In addition, I will use REBELS to directly measure the dust-obscured cosmic star formation rate density at z~7.