ALMA Lensing Cluster Survey: Deep 1.2 mm Number Counts and Infrared Luminosity Functions at z ≃ 1–8
Abstrak
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 arcmin ^2 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 μ Jy, and find that the total integrated 1.2 mm flux is ${20.7}_{-6.5}^{+8.5}$ 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 $1/{V}_{\max }$ 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 ${161}_{-21}^{+25}$ % 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.
Topik & Kata Kunci
Penulis (43)
Seiji Fujimoto
Kotaro Kohno
Masami Ouchi
Masamune Oguri
Vasily Kokorev
Gabriel Brammer
Fengwu Sun
Jorge González-López
Franz E. Bauer
Gabriel B. Caminha
Bunyo Hatsukade
Johan Richard
Ian Smail
Akiyoshi Tsujita
Yoshihiro Ueda
Ryosuke Uematsu
Adi Zitrin
Dan Coe
Jean-Paul Kneib
Marc Postman
Keiichi Umetsu
Claudia del P. Lagos
Gergö Popping
Yiping Ao
Larry Bradley
Karina Caputi
Miroslava Dessauges-Zavadsky
Eiichi Egami
Daniel Espada
R. J. Ivison
Mathilde Jauzac
Kirsten K. Knudsen
Anton M. Koekemoer
Georgios E. Magdis
Guillaume Mahler
A. M. Muñoz Arancibia
Timothy Rawle
Kazuhiro Shimasaku
Sune Toft
Hideki Umehata
Francesco Valentino
Tao Wang
Wei-Hao Wang
Akses Cepat
- Tahun Terbit
- 2024
- Sumber Database
- DOAJ
- DOI
- 10.3847/1538-4365/ad5ae2
- Akses
- Open Access ✓