Searching for high-z DSFGs with NIKA2 and NOEMA

TL;DR

This paper discusses the search for high-redshift dusty star-forming galaxies using NIKA2 and NOEMA, highlighting a new joint-analysis method for identifying their spectroscopic redshifts amidst noisy data.

Contribution

It introduces the NIKA2 Cosmological Legacy Survey and a novel joint-analysis technique for determining redshifts of high-z DSFGs from noisy spectra and photometry.

Findings

Successful identification of redshifts in DSFGs using the new method

Deep wide-area millimeter survey for high-z DSFGs conducted

Method improves efficiency of spectroscopic redshift determination

Abstract

As the possible progenitors of passive galaxies at z=2-3, dusty star-forming galaxies (DSFGs) at z>4 provide a unique perspective to study the formation, assembly, and early quenching of massive galaxies in the early Universe. The extreme obscuration in optical-IR makes (sub)mm spectral scans the most universal and unbiased way to confirm/exclude the high-z nature of candidate dusty star-forming galaxies. We present here the status of the NIKA2 Cosmological Legacy Survey (N2CLS), which is the deepest wide-area single-dish survey in the millimeter searching for high-z DSFGs. We also introduce a joint-analysis method to efficiently search for the spectroscopic redshift of high-z DSFGs with noisy spectra and photometric data and present its success in identifying the redshift of DSFGs found in NIKA2 science verification data.