Alma observation of 158µm [Cii] line and dust continuum of a z = 7 normally star-forming galaxy in the epoch of reionization
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Ota, Kazuaki; Walter, Fabian; Hatsukade, Bunyo; Carilli, C L; da Cunha, Elisabete; Gonzalez-Lopez, J.; Decarli, Roberto; Hodge, Jacqueline; Egami, Eiichi; Bertoldi, Frank; Weiss, A
Description
We present ALMA observations of the [C II] line and far-infrared (FIR) continuum of a normally star-forming galaxy in the reionization epoch, the z = 6.96 Lyα emitter (LAE) IOK-1. Probing to sensitivities of σline = 240 μJy beam–1 (40 km s–1 channel) and σcont = 21 μJy beam–1, we found the galaxy undetected in both [C II] and continuum. Comparison of ultraviolet (UV)-FIR spectral energy distribution (SED) of IOK-1, including our ALMA limit, with those of several types of local galaxies...[Show more]
dc.contributor.author | Ota, Kazuaki | |
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dc.contributor.author | Walter, Fabian | |
dc.contributor.author | Hatsukade, Bunyo | |
dc.contributor.author | Carilli, C L | |
dc.contributor.author | da Cunha, Elisabete | |
dc.contributor.author | Gonzalez-Lopez, J. | |
dc.contributor.author | Decarli, Roberto | |
dc.contributor.author | Hodge, Jacqueline | |
dc.contributor.author | Egami, Eiichi | |
dc.contributor.author | Bertoldi, Frank | |
dc.contributor.author | Weiss, A | |
dc.date.accessioned | 2018-11-29T22:52:29Z | |
dc.date.available | 2018-11-29T22:52:29Z | |
dc.identifier.issn | 0004-637X | |
dc.identifier.uri | http://hdl.handle.net/1885/152191 | |
dc.description.abstract | We present ALMA observations of the [C II] line and far-infrared (FIR) continuum of a normally star-forming galaxy in the reionization epoch, the z = 6.96 Lyα emitter (LAE) IOK-1. Probing to sensitivities of σline = 240 μJy beam–1 (40 km s–1 channel) and σcont = 21 μJy beam–1, we found the galaxy undetected in both [C II] and continuum. Comparison of ultraviolet (UV)-FIR spectral energy distribution (SED) of IOK-1, including our ALMA limit, with those of several types of local galaxies (including the effects of the cosmic microwave background, CMB, on the FIR continuum) suggests that IOK-1 is similar to local dwarf/irregular galaxies in SED shape rather than highly dusty/obscured galaxies. Moreover, our 3σ FIR continuum limit, corrected for CMB effects, implies intrinsic dust mass M dust < 6.4 × 107 M ☉, FIR luminosity L FIR < 3.7 × 1010 L ☉ (42.5-122.5 μm), total IR luminosity L IR < 5.7 × 1010 L ☉ (8-1000 μm), and dust-obscured star formation rate (SFR) < 10 M ☉ yr–1, if we assume that IOK-1 has a dust temperature and emissivity index typical of local dwarf galaxies. This SFR is 2.4 times lower than one estimated from the UV continuum, suggesting that <29% of the star formation is obscured by dust. Meanwhile, our 3σ [C II] flux limit translates into [C II] luminosity, L [C II] < 3.4 × 107 L ☉. Locations of IOK-1 and previously observed LAEs on the L [C II] versus SFR and L [C II]/L FIR versus L FIR diagrams imply that LAEs in the reionization epoch have significantly lower gas and dust enrichment than AGN-powered systems and starbursts at similar/lower redshifts, as well as local star-forming galaxies. | |
dc.format.mimetype | application/pdf | |
dc.publisher | IOP Publishing | |
dc.source | The Astrophysical Journal | |
dc.title | Alma observation of 158µm [Cii] line and dust continuum of a z = 7 normally star-forming galaxy in the epoch of reionization | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 792 | |
dc.date.issued | 2014 | |
local.identifier.absfor | 020104 - Galactic Astronomy | |
local.identifier.ariespublication | a383154xPUB8692 | |
local.type.status | Published Version | |
local.contributor.affiliation | Ota, Kazuaki, University of Cambridge | |
local.contributor.affiliation | Walter, Fabian, Max Planck Institute for Astronomy | |
local.contributor.affiliation | Hatsukade, Bunyo, National Astronomical Observatory of Japan | |
local.contributor.affiliation | Carilli, C L, National Radio Astronomy Observatory | |
local.contributor.affiliation | da Cunha, Elisabete, College of Science, ANU | |
local.contributor.affiliation | Gonzalez-Lopez, J. , Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile | |
local.contributor.affiliation | Decarli, Roberto, Max-Planck Institut fur Astronomie | |
local.contributor.affiliation | Hodge, Jacqueline, Max-Planck-Institut fur Astrophysik | |
local.contributor.affiliation | Egami, Eiichi, University of Arizona | |
local.contributor.affiliation | Bertoldi, Frank, Argelander Institute for Astronomy | |
local.contributor.affiliation | Weiss, A, Max-Planck Institut für Radioastronomie | |
local.bibliographicCitation.issue | 1 | |
local.bibliographicCitation.startpage | 13 | |
local.identifier.doi | 10.1088/0004-637X/792/1/34 | |
dc.date.updated | 2018-11-29T07:46:40Z | |
local.identifier.scopusID | 2-s2.0-84906249738 | |
local.identifier.thomsonID | 000341172100034 | |
dcterms.accessRights | Open Access | |
Collections | ANU Research Publications |
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