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ALMA Lensing Cluster Survey: ALMA-Herschel Joint Study of Lensed Dusty Star-forming Galaxies across z ≃ 0.5 – 6

Sun, Fengwu; Egami, Eiichi; Fujimoto, Seiji; Rawle, Timothy; Bauer, Franz E.; Kohno, Kotaro; Smail, Ian; Pérez-González, Pablo G.; Ao, Yiping; Chapman, Scott C.; Combes, Francoise; Dessauges-Zavadsky, Miroslava; Espada, Daniel; González-López, Jorge; Koekemoer, Anton M.; Kokorev, Vasily; Lee, Minju M.; Morokuma-Matsui, Kana; Muñoz Arancibia, Alejandra M.; Oguri, Masamune; Pelló, Roser; Ueda, Yoshihiro; Uematsu, Ryosuke; Valentino, Francesco; Van der Werf, Paul; Walth, Gregory L.; Zemcov, Michael; Zitrin, Adi

Authors

Fengwu Sun

Eiichi Egami

Seiji Fujimoto

Timothy Rawle

Franz E. Bauer

Kotaro Kohno

Pablo G. Pérez-González

Yiping Ao

Scott C. Chapman

Francoise Combes

Miroslava Dessauges-Zavadsky

Daniel Espada

Jorge González-López

Anton M. Koekemoer

Vasily Kokorev

Minju M. Lee

Kana Morokuma-Matsui

Alejandra M. Muñoz Arancibia

Masamune Oguri

Roser Pelló

Yoshihiro Ueda

Ryosuke Uematsu

Francesco Valentino

Paul Van der Werf

Gregory L. Walth

Michael Zemcov

Adi Zitrin



Abstract

We present an ALMA-Herschel joint analysis of sources detected by the ALMA Lensing Cluster Survey (ALCS) at 1.15 mm. Herschel/PACS and SPIRE data at 100–500 μm are deblended for 180 ALMA sources in 33 lensing cluster fields that are detected either securely (141 sources; in our main sample) or tentatively at S/N ≥ 4 with cross-matched HST/Spitzer counterparts, down to a delensed 1.15 mm flux density of ∼0.02 mJy. We performed far-infrared spectral energy distribution modeling and derived the physical properties of dusty star formation for 125 sources (109 independently) that are detected at >2σ in at least one Herschel band. A total of 27 secure ALCS sources are not detected in any Herschel bands, including 17 optical/near-IR-dark sources that likely reside at z = 4.2 ± 1.2. The 16th, 50th, and 84th percentiles of the redshift distribution are 1.15, 2.08, and 3.59, respectively, for ALCS sources in the main sample, suggesting an increasing fraction of z ≃ 1 − 2 galaxies among fainter millimeter sources (f1150 ∼ 0.1 mJy). With a median lensing magnification factor of $\mu ={2.6}_{-0.8}^{+2.6}$, ALCS sources in the main sample exhibit a median intrinsic star formation rate of ${94}_{-54}^{+84}$ M⊙ yr−1, lower than that of conventional submillimeter galaxies at similar redshifts by a factor of ∼3. Our study suggests weak or no redshift evolution of dust temperature with LIR < 1012 L⊙ galaxies within our sample at z ≃ 0 − 2. At LIR > 1012 L⊙, the dust temperatures show no evolution across z ≃ 1–4 while being lower than those in the local universe. For the highest-redshift source in our sample (z = 6.07), we can rule out an extreme dust temperature (>80 K) that was reported for MACS0416 Y1 at z = 8.31.

Citation

Sun, F., Egami, E., Fujimoto, S., Rawle, T., Bauer, F. E., Kohno, K., …Zitrin, A. (2022). ALMA Lensing Cluster Survey: ALMA-Herschel Joint Study of Lensed Dusty Star-forming Galaxies across z ≃ 0.5 – 6. Astrophysical Journal, 932(2), Article 77. https://doi.org/10.3847/1538-4357/ac6e3f

Journal Article Type Article
Acceptance Date May 3, 2022
Online Publication Date Jun 17, 2022
Publication Date Jun 20, 2022
Deposit Date Jul 12, 2022
Publicly Available Date Jul 14, 2022
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 932
Issue 2
Article Number 77
DOI https://doi.org/10.3847/1538-4357/ac6e3f

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