Faint millimeter NIKA2 dusty star-forming galaxies: finding the high-redshift population

• DOI: 10.48550/arxiv.2403.00911
• Publication Date: 2024-03-01
• Authors: L. Bing; A. Beelen; G. Lagache; R. Adam; P. A. R. Ade; H. Ajeddig; P. André; E. Artis; H. Aussel; A. Benoı̂t; S. Berta; M. Béthermin; O. Bourrion; M. Calvo Gomez; A. Catalano; M. De Petris; F. -X. Désert; S. Doyle; E. F. C. Driessen; A. Gómez; J. Goupy; F. Kéruzoré; C. Krämer; B. Ladjelate; S. Leclercq; Daizhong Liu; J.-F. Lestrade; J. F. Macías–Pérez; A. Maury; P. Mauskopf; F. Mayet; A. Monfardini; M. Muñoz-Echeverría; R. Neri; L. Perotto; G. Pisano; N. Ponthieu; V. Revéret; A. J. Rigby; A. Ritacco; C. Romero; H. Roussel; F. Ruppin; K. Schüster; S. Shu; A. Sievers; C. Tucker; Mengyuan Xiao; R. Zylka
• Keywords: Star (game theory)

We develop a new framework to constrain the source redshift. The method jointly accounts for detection/non-detection of spectral lines and prior information from photometric redshift total infrared luminosity energy distribution analysis. uses estimated predict line fluxes at given redshifts generates model spectra. redshift-dependent models are then compared with observed spectra find Results. apply aforementioned joint analysis four high-z dusty star-forming galaxy candidates selected NIKA2 observations HLSJ091828.6+514223 (HLS) field, further by NOEMA blind scans. These sources only have SPIRE/Herschel photometry as ancillary data. They were because very faint or no SPIRE counterparts, bias sample towards highest candidates. finds spectroscopic 4 in 5 NOEMA-counterpart detected sources, z>3. Based on these measurements, we derive CO/[CI] millimeter continuum data study their ISM star-formation properties. cold dust temperatures some HLS general population sub-millimeter galaxies, which might be related introduced SPIRE-dropout selection. Our but one, short gas depletion time few hundred Myrs, is typical among galaxies. exception shows longer time, up Gyrs, comparable that main-sequence galaxies same Furthermore, identify possible over-density z=5.2, traced two our sample, well lensed HLSJ091828.6+514223. (abridged)