N.H. Hayatsu
ALMA deep field in SSA22: Blindly detected CO emitters and [C ii] emitter candidates
Hayatsu, N.H.; Matsuda, Y.; Umehata, H.; Yoshida, N.; Smail, I.; Swinbank, A.M.; Ivison, R.; Kohno, K.; Tamura, Y.; Kubo, M.; Iono, D.; Hatsukade, B.; Nakanishi, K.; Kawabe, R.; Nagao, T.; Inoue, A.K.; Takeuchi, T.T.; Lee, M.; Ao, Y.; Fujimoto, S.; Izumi, T.; Yamaguchi, Y.; Ikarashi, S.; Yamada, T.
Authors
Y. Matsuda
H. Umehata
N. Yoshida
Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
A.M. Swinbank
R. Ivison
K. Kohno
Y. Tamura
M. Kubo
D. Iono
B. Hatsukade
K. Nakanishi
R. Kawabe
T. Nagao
A.K. Inoue
T.T. Takeuchi
M. Lee
Y. Ao
S. Fujimoto
T. Izumi
Y. Yamaguchi
S. Ikarashi
T. Yamada
Abstract
We report the identification of four millimeter line-emitting galaxies with the Atacama Large Milli/submillimeter Array (ALMA) in SSA22 Field (ADF22). We analyze the ALMA 1.1-mm survey data, with an effective survey area of 5 arcmin2, frequency ranges of 253.1–256.8 and 269.1–272.8 GHz, angular resolution of 0 ′′. .′′ 7 and rms noise of 0.8 mJy beam−1 at 36 km s−1 velocity resolution. We detect four line-emitter candidates with significance levels above 6σ. We identify one of the four sources as a CO(9–8) emitter at z = 3.1 in a member of the proto-cluster known in this field. Another line emitter with an optical counterpart is likely a CO(4–3) emitter at z = 0.7. The other two sources without any millimeter continuum or optical/near-infrared counterpart are likely to be [C II] emitter candidates at z = 6.0 and 6.5. The equivalent widths of the [C II] candidates are consistent with those of confirmed high-redshift [C II] emitters and candidates, and are a factor of 10 times larger than that of the CO(9–8) emitter detected in this search. The [C II] luminosity of the candidates are 4–7 × 108 L⊙. The star formation rates (SFRs) of these sources are estimated to be 10–20 M⊙ yr−1 if we adopt an empirical [C II] luminosity–SFR relation. One of them has a relatively low S/N ratio, but shows features characteristic of emission lines. Assuming that at least one of the two candidates is a [C II] emitter, we derive a lower limit of [C II]-based star formation rate density (SFRD) at z ∼ 6. The resulting value of >10−2 M⊙ yr−1 Mpc−3 is consistent with the dust-uncorrected UV-based SFRD. Future millimeter/submillimeter surveys can be used to detect a number of high-redshift line emitters, with which to study the star formation history in the early universe.
Citation
Hayatsu, N., Matsuda, Y., Umehata, H., Yoshida, N., Smail, I., Swinbank, A., …Yamada, T. (2017). ALMA deep field in SSA22: Blindly detected CO emitters and [C ii] emitter candidates. Publications of Astronomical Society of Japan, 69(3), https://doi.org/10.1093/pasj/psx018
Journal Article Type | Article |
---|---|
Acceptance Date | Feb 24, 2017 |
Online Publication Date | May 4, 2017 |
Publication Date | May 4, 2017 |
Deposit Date | Aug 21, 2017 |
Publicly Available Date | May 4, 2018 |
Journal | Publications of Astronomical Society of Japan |
Print ISSN | 0004-6264 |
Electronic ISSN | 2053-051X |
Publisher | Oxford University Press |
Peer Reviewed | Peer Reviewed |
Volume | 69 |
Issue | 3 |
DOI | https://doi.org/10.1093/pasj/psx018 |
Public URL | https://durham-repository.worktribe.com/output/1349238 |
Related Public URLs | http://ukads.nottingham.ac.uk/abs/2017PASJ...69...45H |
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Copyright Statement
This is a pre-copyedited, author-produced version of an article accepted for publication in Publications of the Astronomical Society of Japan following peer review. The version of record Hayatsu, N.H., Matsuda, Y., Umehata, H., Yoshida, N., Smail, I., Swinbank, A.M., Ivison, R., Kohno, K., Tamura, Y., Kubo, M., Iono, D., Hatsukade, B., Nakanishi, K., Kawabe, R., Nagao, T., Inoue, A.K., Takeuchi, T.T., Lee, M., Ao, Y., Fujimoto, S., Izumi, T., Yamaguchi, Y., Ikarashi, S. & Yamada, T. (2017). ALMA deep field in SSA22: Blindly detected CO emitters and [C ii] emitter candidates. Publications of the Astronomical Society of Japan 69(3): 45 is available online at: https://doi.org/https://doi.org/10.1093/pasj/psx018
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