Abstract

Understanding the evolution of galaxies in the first billion years after the Big Bang requires observations of the dust-obscured galaxy population. In this talk, I share results from pencil-beam ALMA observations of two galaxies, A1689-zD1 and MAMBO-9. The former is a gravitationally lensed sub-L* galaxy at z=7.13; the latter is a highly obscured starburst galaxy at z=5.85. In both galaxies, dust continuum observations suggest highly dust obscured star-formation. Moreover, detection of far-infrared fine-structure emission lines ([CII] 158 µm and [OIII] 88 µm) facilitate detailed kinematic studies and constraints on ISM properties. These two examples paint a picture of early galaxy evolution driven by chaotic processes such as outflows and mergers, and highlight the power of ALMA for followup of high-redshift candidates in the JWST era.