Deep [OIII] 88um and dust continuum observations of two remarkably luminous galaxies at z~10

ALMA | Cycle 8 | 17.8hrs | PI - T. Hashimoto

We propose [OIII] 88 um and dust continuum observations of two remarkably UV-luminous (MUV=-23) galaxies at z~10. Our targets are carefully selected from the brand-new COSMOS2020 catalogue equipped with deep and unprecedentedly-wide optical to near-infrared data, the best suitable to find the rarest, brightest galaxies. Our two candidates have 1) sharp Lyman break features; 2) IRAC detection; 3) tight photo-z solutions. The volume density of these objects is consistent with the bright-end of the UV luminosity function (UVLF) studies at z=9-10 that suggests a double power-law. We aim to identify these objects by [OIII], which is proven to be the best FIR line to observe z>8 galaxies. A successful detection will confirm the power-law nature of the UVLF for the first time by spectroscopy. This has significant implication in the field of galaxy formation as they would represent a transition before significant dust attenuation and mass quenching. We will also directly observe the dust continuum,which is crucial to test the dust-poor hypothesis as the physical origins of the brightest galaxies.

John R. Weaver
John R. Weaver
PhD Fellow in Astrophysics

My research interests lie almost exclusively within the realm of extragalactic astrophysics and cosmology. I use state-of-the-art optical and infrared observatories and surveys to study the lives of galaxies, and how their properties change over cosmic time. This includes detailed case studies of individual galaxies, as well as statistical analyses of large survey catalogs.