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

Fengwu Sun, Eiichi Egami, Seiji Fujimoto, Timothy Rawle, Franz E. Bauer, Kotaro Kohno, Ian Smail, 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 OguriRoser Pelló, Yoshihiro Ueda, Ryosuke Uematsu, Francesco Valentino, Paul Van Der Werf, Gregory L. Walth, Michael Zemcov, Adi Zitrin

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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 (f 1150 ∼0.1 mJy). With a median lensing magnification factor of μ=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 L IR < 1012 L ⊙ galaxies within our sample at z ≃ 0 - 2. At L IR > 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.

Original languageEnglish
Article number77
JournalAstrophysical Journal
Volume932
Issue number2
DOIs
StatePublished - 1 Jun 2022

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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