Searching for high-z DSFGs with NIKA2 and NOEMA

L Bing ,A Benoı̂t ,A Monfardini ,C Krämer ,H Ajeddig ,J F Macías-Pérez ,H Roussel ,F Kéruzoré ,C Tucker ,J F Lestrade ,F Ruppin ,E F C Driessen ,A Gómez ,A Maury ,L Perotto ,M Calvo ,A Beelen ,Andrew Rigby ,S Doyle ,P André ,H Aussel ,F.-X Désert ,Peter A R Ade ,A Ritacco ,F Mayet ,A Catalano ,R Neri ,B Ladjelate ,R Adam ,M Muñoz-Echeverría ,S Berta ,V Revéret ,S Leclercq ,C Romero ,G Pisano ,K Schuster ,S Shu ,A Omont ,A Sievers ,G Lagache ,M De Petris ,E Artis ,J Goupy ,Philip Daniel Mauskopf ,N Ponthieu ,O Bourrion ,M Béthermin ,R Zylka

doi:10.1051/epjconf/202225700006

Abstract

As the possible progenitors of passive galaxies at z=2-3, dusty starforming 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 singledish survey in the millimeter searching for high-z DSFGs. We also introduce a joint-analysis method to effciently 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.

Highlights

In the past decades, optical-IR deep-field observations have contributed to the studies on galaxy assembly in the early Universe [1]
This is mainly due to the difficulties in defining a large unbiased high-z dusty star-forming galaxies (DSFGs) sample and properly reconstructing the infrared luminosity function (IRLF)
We introduce a new method to search for the redshift of DSFGs combining broadband photometry and mm spectral scan

Summary

Introduction

Optical-IR deep-field observations have contributed to the studies on galaxy assembly in the early Universe [1]. While most of the UV photons are absorbed, their energy heat the dusty ISM and is reemitted mostly in far-IR This makes dusty star-forming galaxies (DSFGs) bright in far-IR to the millimeter and constitutes the majority of sources in blind ALMA and single-dish observations. Complementary to optical and near-IR observations, far-IR to millimeter surveys provide additional constraints on total SFRD and the rise of massive galaxies at z 4 sources Their small area limits the sample size, the bright end of the IRLF is still poorly sampled. We introduce a new method to search for the redshift of DSFGs combining broadband photometry and mm spectral scan

Basic Information and Status of N2CLS

Searching for the Redshift of DSFGs Scanned by NOEMA