The dust properties of star-forming galaxies in the first billion years
Abstract
The Atacama Large Millimetre/Sub-millimetre Array (ALMA) is obtaining the deepest observations of early galaxies ever achieved at (sub-)millimetre wavelengths, and detecting the dust emission of young galaxies in the first billion years of cosmic history, well in the epoch of reionization. Here I review some of the latest results from these observations, with special focus on the REBELS large programme, which targets a sample of 40 star-forming galaxies at z ⋍ 7. ALMA detects significant amounts of dust in very young galaxies, and this dust might have different properties to dust in lower-redshift galaxies. I describe the evidence for this, and discuss theoretical/modelling efforts to explain the dust properties of these young galaxies. Finally, I describe two additional surprising results to come out of the REBELS survey: (i) a new population of completely dust-obscured galaxies at z ⋍ 7, and (ii) the prevalence of spatial offsets between the ultraviolet and infrared emission of UV-bright, high-redshift star-forming galaxies.
- Publication:
-
Resolving the Rise and Fall of Star Formation in Galaxies
- Pub Date:
- 2023
- DOI:
- 10.1017/S1743921322003866
- arXiv:
- arXiv:2211.00850
- Bibcode:
- 2023IAUS..373..215D
- Keywords:
-
- galaxies: evolution;
- galaxies: high-redshift;
- galaxies: ISM;
- dust;
- extinction;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 10 pages, 5 figures