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- Title
ALMA deep field in SSA22: Blindly detected CO emitters and [C<sub>II</sub>] emitter candidates.
- Authors
HAYATSU, Natsuki H.; Yuichi MATSUDA; Hideki UMEHATA; Naoki YOSHIDA; SMAIL, Ian; SWINBANK, A. Mark; IVISON, Rob; Kotaro KOHNO; Yoichi TAMURA; Mariko KUBO; Daisuke IONO; Bunyo HATSUKADE; Kouichiro NAKANISHI; Ryohei KAWABE; Tohru NAGAO; INOUE, Akio K.; TAKEUCHI, Tsutomu T.; Minju LEE; Yiping AO; Seiji FUJIMOTO
- 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 0.8mJy beam-1 at 36kms-1 velocity resolution. We detect four line-emitter candidates with significance levels above 6s. 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 anymillimeter 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 10-20M⊙ 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 >10-2M⊙ 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.
- Subjects
GALAXIES; ATACAMA Large Millimeter Array (Project); STAR formation; LUMINOSITY; NEAR infrared radiation
- Publication
Publications of the Astronomical Society of Japan, 2017, Vol 69, Issue 3, p1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psx018