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ALMA detection of the [OIII] 88 μm line in a highly-magnified Lyman break galaxy at z = 6.1

Authors :
Akio Taniguchi
Kaho Sunaga
Ken Mawatari
Takuya Hashimoto
Akio K. Inoue
Hiroshi Matsuo
Minju Lee
Yoichi Tamura
Source :
Proceedings of the International Astronomical Union. 15:309-311
Publication Year :
2019
Publisher :
Cambridge University Press (CUP), 2019.

Abstract

We present a 4.7σ detection of the [OIII] 88 μm line in a gravitationally-lensed Lyman break galaxy, RXC J2248-ID3, using the Atacama Large Millimeter/submillimeter Array (ALMA). We did not detect [CII] 158 μm and rest-frame 90 μm dust continuum emission, suggesting that the bulk of the interstellar medium (ISM) is ionized. Our two-component SED model combining the previous Hubble Space Telescope (HST) data and new photometry obtained from Very Large Telescope (VLT), Spitzer and ALMA suggests the presence of young (∼2 Myr) and mature (∼600 Myr) stellar components with the metallicity of Z = 0.2Z⊙. Our findings are in contrast with previous results claiming a very young, metal-poor stellar component.

Details

ISSN :
17439221 and 17439213
Volume :
15
Database :
OpenAIRE
Journal :
Proceedings of the International Astronomical Union
Accession number :
edsair.doi...........d027736f33a201713a4b6ce836412630