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ALMA Lensing Cluster Survey: Bright [C ii] 158 μm Lines from a Multiply Imaged Sub-L⋆ Galaxy at z = 6.0719

Fujimoto, Seiji; Oguri, Masamune; Brammer, Gabriel; Yoshimura, Yuki; Laporte, Nicolas; González-López, Jorge; Caminha, Gabriel B.; Kohno, Kotaro; Zitrin, Adi; Richard, Johan; Ouchi, Masami; Bauer, Franz E.; Smail, Ian; Hatsukade, Bunyo; Ono, Yoshiaki; Kokorev, Vasily; Umehata, Hideki; Schaerer, Daniel; Knudsen, Kirsten; Sun, Fengwu; Magdis, Georgios; Valentino, Francesco; Ao, Yiping; Toft, Sune; Dessauges-Zavadsky, Miroslava; Shimasaku, Kazuhiro; Caputi, Karina; Kusakabe, Haruka; Morokuma-Matsui, Kana; Shotaro, Kikuchihara; Egami, Eiichi; Lee, Minju M.; Rawle, Timothy; Espada, Daniel

ALMA Lensing Cluster Survey: Bright [C ii] 158 μm Lines from a Multiply Imaged Sub-L⋆ Galaxy at z = 6.0719 Thumbnail


Authors

Seiji Fujimoto

Masamune Oguri

Gabriel Brammer

Yuki Yoshimura

Nicolas Laporte

Jorge González-López

Gabriel B. Caminha

Kotaro Kohno

Adi Zitrin

Johan Richard

Masami Ouchi

Franz E. Bauer

Bunyo Hatsukade

Yoshiaki Ono

Vasily Kokorev

Hideki Umehata

Daniel Schaerer

Kirsten Knudsen

Fengwu Sun

Georgios Magdis

Francesco Valentino

Yiping Ao

Sune Toft

Miroslava Dessauges-Zavadsky

Kazuhiro Shimasaku

Karina Caputi

Haruka Kusakabe

Kana Morokuma-Matsui

Kikuchihara Shotaro

Eiichi Egami

Minju M. Lee

Timothy Rawle

Daniel Espada



Abstract

We present bright [C ii] 158 μm line detections from a strongly magnified and multiply imaged (μ ∼ 20–160) sub–L* (${M}_{\mathrm{UV}}=-{19.75}_{-0.44}^{+0.55}$) Lyman-break galaxy (LBG) at z = 6.0719 ± 0.0004, drawn from the ALMA Lensing Cluster Survey (ALCS). Emission lines are identified at 268.7 GHz at ≥8σ exactly at the positions of two multiple images of the LBG, behind the massive galaxy cluster RXCJ0600−2007. Our lens models, updated with the latest spectroscopy from VLT/MUSE, indicate that a sub region of the LBG crosses the caustic, and is lensed into a long (∼6'') arc with a local magnification of μ ∼ 160, for which the [C ii] line is also significantly detected. The source plane reconstruction resolves the interstellar medium (ISM) structure, showing that the [C ii] line is co-spatial with the rest-frame UV continuum at a scale of ∼300 pc. The [C ii] line properties suggest that the LBG is a rotation-dominated system, whose velocity gradient explains a slight difference in redshifts between the whole LBG and its sub-region. The star formation rate (SFR)–L[CII] relations, for whole and sub-regions of the LBG, are consistent with those of local galaxies. We evaluate the lower limit of the faint-end of the [C ii] luminosity function at z = 6, finding it to be consistent with predictions from semi-analytical models and from the local SFR–L[CII] relation with a SFR function at z = 6. These results imply that the local SFR–L[CII] relation is universal for a wide range of scales, including the spatially resolved ISM, the whole region of the galaxy, and the cosmic scale, even in the epoch of reionization.

Citation

Fujimoto, S., Oguri, M., Brammer, G., Yoshimura, Y., Laporte, N., González-López, J., …Espada, D. (2021). ALMA Lensing Cluster Survey: Bright [C ii] 158 μm Lines from a Multiply Imaged Sub-L⋆ Galaxy at z = 6.0719. Astrophysical Journal, 911(2), https://doi.org/10.3847/1538-4357/abd7ec

Journal Article Type Article
Acceptance Date Dec 29, 2020
Online Publication Date Apr 22, 2021
Publication Date 2021-04
Deposit Date May 5, 2021
Publicly Available Date Mar 28, 2024
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 911
Issue 2
DOI https://doi.org/10.3847/1538-4357/abd7ec

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Copyright Statement
© 2021. The American Astronomical Society. All rights reserved.





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