Seiji Fujimoto
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
Authors
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
Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
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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