ALMA Lensing Cluster Survey: Bright [C ii] 158 mu m Lines from a Multiply Imaged Sub-L* Galaxy at z=6.0719
Review article, 2021
We present bright [C ii] 158 mu m line detections from a strongly magnified and multiply imaged (mu similar to 20-160) sub-L* (MUV=-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 >= 8 sigma 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 (similar to 6 '') arc with a local magnification of mu similar to 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 similar to 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.
Author
Seiji Fujimoto
University of Copenhagen
Masamune Oguri
University of Tokyo
Gabriel Brammer
University of Copenhagen
Yuki Yoshimura
University of Tokyo
Nicolas Laporte
University of Cambridge
Jorge Gonzalez-Lopez
Diego Portales University
Carnegie Institution for Science
Gabriel B. Caminha
University of Groningen
Kotaro Kohno
University of Tokyo
Adi Zitrin
Ben-Gurion University of the Negev
Johan Richard
Université de Lyon
Masami Ouchi
University of Tokyo
National Astronomical Observatory of Japan
Franz E. Bauer
Millennium Institute of Astrophysics
Pontificia Universidad Catolica de Chile
Ian Smail
Durham University
Bunyo Hatsukade
University of Tokyo
Yoshiaki Ono
University of Tokyo
Vasily Kokorev
University of Copenhagen
Hideki Umehata
RIKEN
University of Tokyo
Daniel Schaerer
University of Geneva
Centre national de la recherche scientifique (CNRS)
Kirsten Kraiberg Knudsen
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Fengwu Sun
University of Arizona
Georgios Magdis
University of Copenhagen
Technical University of Denmark (DTU)
Francesco Valentino
University of Copenhagen
Yiping Ao
Chinese Academy of Sciences
Sune Toft
University of Copenhagen
Miroslava Dessauges-Zavadsky
University of Geneva
Kazuhiro Shimasaku
University of Tokyo
Karina Caputi
University of Copenhagen
University of Groningen
Haruka Kusakabe
University of Geneva
Kana Morokuma-Matsui
University of Tokyo
Kikuchihara Shotaro
University of Tokyo
Eiichi Egami
University of Arizona
Minju M. Lee
Max Planck Society
Timothy Rawle
European Space Research and Technology Centre (ESA ESTEC)
Daniel Espada
SKA Organisation
Astrophysical Journal
0004-637X (ISSN) 1538-4357 (eISSN)
Vol. 911 2 99Subject Categories
Astronomy, Astrophysics and Cosmology
Other Physics Topics
Computer Vision and Robotics (Autonomous Systems)
DOI
10.3847/1538-4357/abd7ec