Year: 2026
Type: preprint
Abstract: We present the reduction and source catalogs for the \textit{COSMOS High-$z$ ALMA-MIRI Population Survey} (CHAMPS), the largest Atacama Large (Sub)Millimeter Array (ALMA) blank field survey to date at 0.2\,deg$^2$. With observing frequency centered at $250\, $GHz ($1.2\,$mm) and bandwidth of 7.5 GHz, CHAMPS covers the JWST/NIRCam+MIRI footprint in the COSMOS field, taking advantage of the rich, multiwavelength ancillary datasets in COSMOS ranging from X-ray to radio. The majority of the CHAMPS survey (90$\%$) has depths at or below 200 $μ$Jy beam$^{-1}$ and with an average RMS of 146 $μ$Jy beam$^{-1}$. The reduced CHAMPS mosaic has a beam size of $θ_{\rm res} = 1.1'' \times 1.1''$. CHAMPS identifies sources via two detection methods, a blind search for high-SNR sources, and a prior-based search involving MIRI detections to identify faint sources. The blind search yields a total of 595 sources down to an SNR $\ge4.5σ$ while the prior catalog yields a total of 3162 source down to an SNR $\ge3σ$, leading to a full sample of 3355 unique objects detected across both catalogs. We identify a unique population of 385 SNR $\ge5σ$ sources across the two catalogs; after excluding 9 likely spurious edge detections we define a robust science sample of 376 sources above $\ge5σ$. These sources have a median redshift of $\langle z_{1.2 \text{ mm}}\rangle = 2.54^{+0.89}_{-1.69}$ based on optical/near-IR/mid-IR photometric redshifts and high-quality spectroscopic redshifts, and hold a median stellar mass of $\langle\log (\rm M_\star/M_\odot)\rangle = 10.79^{+0.42}_{-3.08}$. We have further identified 68/376 ($\sim18\%$) sources as candidate AGN through X-ray, UV-optical, infrared and radio selection techniques.
Source: arXiv (Cornell University)
Authors: Martinez, Felix, III, Karaltepe, Jeyhan S., Faisst, Andreas L., Long, Arianna S., Zavala, Jorge A., Casey, Caitlin M., McKinney, Jed, Treister, Ezequiel, Franco, Maximilien, Toft, Sune, Aravena, Manuel, Silverman, John D., Akins, Hollis B., Algera, Hiddo S. B., Antwi-Danso, Jacqueline, Battisti, Andrew J., Cheng, Yingjie, Cooper, Olivia R., Drakos, Nicole E., Flayhart, Carter, Gentile, Fabrizio, Gillman, Steven, Gozaliasl, Ghassem, Harish, Santosh, Hempel-Costello, Simon, Hirschmann, Michaela, Ilbert, Olivier, Jin, Bingcheng, Jin, Shuowen, Kakiichi, Koki, Kelly, Thresa, Li, Zihao, Liu, Daizhong, Liu, Lun-Jun, Manning, Sinclaire M., McCracken, Henry Joy, Meyer, Romain A., Paquereau, Louise, Pudoka, Maria, Rhodes, Jason, Robertson, Brant E., Rodighiero, Giulia, Samir, Rasha M., Sanders, David B., Shuntov, Marko, Talia, Margherita, Vaccari, Mattia, Valentino, Francesco, Vijayan, Aswin P., Wang, Feige, Wang, Wuji, Xu, Can, Yang, Jinyi, Zhu, Yongda, Zou, Siwei
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, National Radio Astronomy Observatory, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Danmarks Grundforskningsfond, Academia Sinica, Korea Astronomy and Space Science Institute, National Astronomical Observatory of Japan, Agencia Nacional de Investigación y Desarrollo, National Institutes of Natural Sciences
Awards: Collaborative Research: WoU-MMA: Surveying black hole growth history through accretion and mergers, G3157600471, Cosmic Dawn Center (DAWN), A COMPREHENSIVE VIEW OF THE CONNECTION BETWEEN SUPERMASSIVE BLACK HOLE GROWTH AND MAJOR GALAXY MERGERS, Graduate Research Fellowship Program (GRFP), G628552264, A Revolutionary New Window on the First Galaxies, SPECTRO-TEMPORAL STUDIES OF AGN POPULATIONS, G8379087001, Management and Operation of the National Radio Astronomy Observatory (NRAO), CENTRO DE ASTROFISICA Y TECNOLOGIAS AFINES (CATA)
OpenAlex ID: W7214948233