Searching for high-z DSFGs with NIKA2 and NOEMA
  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.
