The absence of [C II] 158μm emission in spectroscopically confirmed galaxies at z > 8

N. Laporte*, H. Katz, R. S. Ellis, G. Lagache, F. E. Bauer, F. Boone, A. K. Inoue, T. Hashimoto, H. Matsuo, K. Mawatari, Y. Tamura

*この研究の対応する著者

研究成果: Article査読

22 被引用数 (Scopus)

抄録

The scatter in the relationship between the strength of [C ii] 158 $mu$m emission and the star formation rate at high redshift has been the source of much recent interest. Although the relationship is well established locally, several intensely star-forming galaxies have been found whose [C ii] 158 $mu$m emission is either weak, absent, or spatially offset from the young stars. Here we present new ALMA data for the two most distant gravitationally lensed and spectroscopically confirmed galaxies, A2744-YD4 at z = 8.38 and MACS1149-JD1 at z = 9.11, both of which reveal intense [O iii] 88 $mu$m emission. In both cases we provide stringent upper limits on the presence of [C ii] 158 $mu$m with respect to [O iii] 88 $mu$m. We review possible explanations for this apparent redshift-dependent [C ii] deficit in the context of our recent hydrodynamical simulations. Our results highlight the importance of using several emission line diagnostics with ALMA to investigate the nature of the interstellar medium in early galaxies.

本文言語English
ページ(範囲)L81-L85
ジャーナルMonthly Notices of the Royal Astronomical Society: Letters
487
1
DOI
出版ステータスPublished - 2019 7 1

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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