학술논문
A Near-infrared-faint, Far-infrared-luminous Dusty Galaxy at z ∼ 5 in COSMOS-Web
Document Type
article
Author
Jed McKinney; Sinclaire M. Manning; Olivia R. Cooper; Arianna S. Long; Hollis Akins; Caitlin M. Casey; Andreas L. Faisst; Maximilien Franco; Christopher C. Hayward; Erini Lambrides; Georgios Magdis; Katherine E. Whitaker; Min Yun; Jaclyn B. Champagne; Nicole E. Drakos; Fabrizio Gentile; Steven Gillman; Ghassem Gozaliasl; Olivier Ilbert; Shuowen Jin; Anton M. Koekemoer; Vasily Kokorev; Daizhong Liu; R. Michael Rich; Brant E. Robertson; Francesco Valentino; John R. Weaver; Jorge A. Zavala; Natalie Allen; Jeyhan S. Kartaltepe; Henry Joy McCracken; Louise Paquereau; Jason Rhodes; Marko Shuntov; Sune Toft
Source
The Astrophysical Journal, Vol 956, Iss 2, p 72 (2023)
Subject
Language
English
ISSN
1538-4357
Abstract
A growing number of far-infrared (FIR) bright sources completely invisible in deep extragalactic optical surveys hint at an elusive population of z > 4 dusty, star-forming galaxies. Cycle 1 JWST surveys are now detecting their rest-frame optical light, which provides key insight into their stellar properties and statistical constraints on the population as a whole. This work presents the JWST Near Infrared Camera (NIRCam) counterpart from the COSMOS-Web survey to an FIR SCUBA-2 and Atacama Large Millimeter/submillimeter Array (ALMA) source, AzTECC71, which was previously undetected at wavelengths shorter than 850 μ m. AzTECC71, among the reddest galaxies in COSMOS-Web with F277W − F444W ∼ 0.9, is undetected in NIRCam/F150W and F115W and fainter in F444W than other submillimeter galaxies identified in COSMOS-Web by 2–4 magnitudes. This is consistent with the system having both a lower stellar mass and higher redshift than the median dusty, star-forming galaxy. With deep ground- and space-based upper limits combined with detections in F277W, F444W, and the FIR including ALMA Band 6, we find a high probability (99%) that AzTECC71 is at z > 4 with ${z}_{\mathrm{phot}}={5.7}_{-0.7}^{+0.8}$ . This galaxy is massive ( $\mathrm{log}\,{M}_{* }/{M}_{\odot }\sim 10.7$ ) and infrared-luminous ( $\mathrm{log}\,{L}_{\mathrm{IR}}/{L}_{\odot }\sim 12.7$ ), comparable to other optically undetected but FIR-bright dusty, star-forming galaxies at z > 4. This population of luminous, infrared galaxies at z > 4 is largely unconstrained but comprises an important bridge between the most extreme dust-obscured galaxies and more typical high-redshift star-forming galaxies. If further FIR-selected galaxies that drop out of the F150W filter in COSMOS-Web have redshifts z > 4 like AzTECC71, then the volume density of such sources may be ∼3–10 × greater than previously estimated.