Chasing big bubbles: the confirmation of a bright z=9.8 galaxy

NOEMA | 30.0hrs | PI - F. Valentino

We request 30h of NOEMA/2mm time to spectroscopically confirm the redshift of a novel and robust UV- bright (MUV=-22.9 mag) galaxy candidate at z=9.82 from the new COSMOS2020 catalog. The candidate is massive (log(M/Msun)=10.5), highly star-forming (log(SFR/Msun/yr)=2.2), and shows a tight redshift PDF, which can be covered at 90% with a single NOEMA frequency setting targeting [CII]. These properties suggest a sufficient metal enrichment and encourage the search for this line and its underlying dust continuum emission. If confirmed, this will be a redshift record-breaking discovery, while the [CII] and dust IR luminosity will give us insight into the gas and obscured SFR. This will allow us to explore the SFR or MUV-L[CII] and IRX-beta relations at the unprecedented z~10 regime. This would also support the role of ultra-bright sources to generate large reionization bubbles. The target is 1.5dex more star forming than the only other source confirmed with FIR lines at z=9.11 and it does not suffer from lensing uncertainties. The large bandwidth and arcsec resolution of NOEMA are optimal to carry out this project.

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.