ALMA Lensing Cluster Survey: Deep 1.2 mm Number Counts and Infrared Luminosity Functions at z ≃ 1–8

Fujimoto, Seiji; Kohno, Kotaro; Ouchi, Masami; Oguri, Masamune; Kokorev, Vasily; Brammer, Gabriel; Sun, Fengwu; González-López, Jorge; Bauer, Franz E.; Caminha, Gabriel B.; Hatsukade, Bunyo; Richard, Johan; Smail, Ian; Tsujita, Akiyoshi; Ueda, Yoshihiro; Uematsu, Ryosuke; Zitrin, Adi; Coe, Dan; Kneib, Jean-Paul; Postman, Marc; Umetsu, Keiichi; Lagos, Claudia del P.; Popping, Gergö; Ao, Yiping; Bradley, Larry; Caputi, Karina; Dessauges-Zavadsky, Miroslava; Egami, Eiichi; Espada, Daniel; Ivison, R. J.; Jauzac, Mathilde; Knudsen, Kirsten K.; Koekemoer, Anton M.; Magdis, Georgios E.; Mahler, Guillaume; Muñoz Arancibia, A. M.; Rawle, Timothy; Shimasaku, Kazuhiro; Toft, Sune; Umehata, Hideki; Valentino, Francesco; Wang, Tao; Wang, Wei-Hao

Abstract

We present a statistical study of 180 dust continuum sources identified in 33 massive cluster fields by the Atacama Large Millimeter/submillimeter Array Lensing Cluster Survey (ALCS) over a total of 133 arcmin2 area, homogeneously observed at 1.2 mm. ALCS enables us to detect extremely faint millimeter sources by lensing magnification, including near-infrared (NIR) dark objects showing no counterparts in existing Hubble Space Telescope and Spitzer images. The dust continuum sources belong to a blind sample (N = 141) with signal-to-noise ratio (S/N) ≳ 5.0 (a purity of >0.99) or a secondary sample (N = 39) with S/N = 4.0–5.0 screened by priors. With the blind sample, we securely derive 1.2 mm number counts down to ∼7 μJy, and find that the total integrated 1.2 mm flux is
Jy deg−2, resolving ≃80% of the cosmic infrared background light. The resolved fraction varies by a factor of 0.6–1.1 due to the completeness correction depending on the spatial size of the millimeter emission. We also derive infrared (IR) luminosity functions (LFs) at z = 0.6–7.5 with the
method, finding the redshift evolution of IR LFs characterized by positive luminosity and negative density evolution. The total (= UV + IR) cosmic star formation rate density (SFRD) at z > 4 is estimated to be
% of the Madau and Dickinson measurements mostly based on rest-frame UV surveys. Although our general understanding of the cosmic SFRD is unlikely to change beyond a factor of 2, these results add to the weight of evidence for an additional (≈60%) SFRD component contributed by the faint millimeter population, including NIR-dark objects.

Citation

Fujimoto, S., Kohno, K., Ouchi, M., Oguri, M., Kokorev, V., Brammer, G., Sun, F., González-López, J., Bauer, F. E., Caminha, G. B., Hatsukade, B., Richard, J., Smail, I., Tsujita, A., Ueda, Y., Uematsu, R., Zitrin, A., Coe, D., Kneib, J.-P., Postman, M., …Wang, W.-H. (2024). ALMA Lensing Cluster Survey: Deep 1.2 mm Number Counts and Infrared Luminosity Functions at z ≃ 1–8. Astrophysical Journal Supplement, 275(2), Article 36. https://doi.org/10.3847/1538-4365/ad5ae2

• Journal Article Type: Article
• Acceptance Date: Jun 20, 2024
• Online Publication Date: Nov 27, 2024
• Publication Date: 2024-12
• Deposit Date: Jan 22, 2025
• Publicly Available Date: Jan 22, 2025
• Journal: The Astrophysical Journal Supplement Series
• Print ISSN: 0067-0049
• Electronic ISSN: 1538-4365
• Publisher: American Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 275
• Issue: 2
• Article Number: 36
• DOI: https://doi.org/10.3847/1538-4365/ad5ae2
• Public URL: https://durham-repository.worktribe.com/output/3347157