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

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., Smail, I., Pérez-González, P. G., Ao, Y., Chapman, S. C., Combes, F., Dessauges-Zavadsky, M., Espada, D., González-López, J., Koekemoer, A. M., Kokorev, V., Lee, M. M., Morokuma-Matsui, K., Muñoz Arancibia, A. M., Oguri, M., …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
• Public URL: https://durham-repository.worktribe.com/output/1198863