Spectroscopic confirmation of a gravitationally lensed Lyman-break galaxy at z[C ii]= 6.827 using NOEMA

S. J. Molyneux; R. Smit; D. Schaerer; R. J. Bouwens; L. Bradley; J. A. Hodge; S. N. Longmore; S. Schouws; P. Van Der Werf; A. Zitrin; S. Phillips

doi:10.1093/mnras/stac557

Spectroscopic confirmation of a gravitationally lensed Lyman-break galaxy at z_{[C ii]}= 6.827 using NOEMA

S. J. Molyneux, R. Smit, D. Schaerer, R. J. Bouwens, L. Bradley, J. A. Hodge, S. N. Longmore, S. Schouws, P. Van Der Werf, A. Zitrin, S. Phillips

Department of Physics

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

We present the spectroscopic confirmation of the brightest known gravitationally lensed Lyman-break galaxy in the Epoch of Reionization (EoR), A1703-zD1, through the detection of [C ii] 158 μm at a redshift of z = 6.8269 ± 0.0004. This source was selected behind the strong lensing cluster Abell 1703, with an intrinsic luminosity and a very blue Spitzer/Infrared Array Camera (IRAC) [3.6]-[4.5] colour, implying high equivalent width line emission of [O iii] + Hβ. [C ii] is reliably detected at 6.1σ cospatial with the rest-frame ultraviolet (UV) counterpart, showing similar spatial extent. Correcting for the lensing magnification, the [C ii] luminosity in A1703-zD1 is broadly consistent with the local L[C,II]-star formation rate (SFR) relation. We find a clear velocity gradient of 103 ± 22 km s-1 across the source that possibly indicates rotation or an ongoing merger. We furthermore present spectral scans with no detected [C ii] above 4.6σ in two unlensed Lyman-break galaxies in the Extended Groth Strip (EGS)-Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) field at z ∼6.6-6.9. This is the first time that the Northern Extended Millimeter Array (NOEMA) has been successfully used to observe [C ii] in a 'normal' star-forming galaxy at z > 6, and our results demonstrate its capability to complement the Atacama Large Millimeter/submillimeter Array (ALMA) in confirming galaxies in the EoR.

Original language	English
Pages (from-to)	535-543
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	512
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stac557
State	Published - 1 May 2022

Keywords

galaxies: evolution
galaxies: formation
galaxies: high-redshift

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1093/mnras/stac557

Cite this

Molyneux, S. J., Smit, R., Schaerer, D., Bouwens, R. J., Bradley, L., Hodge, J. A., Longmore, S. N., Schouws, S., Van Der Werf, P., Zitrin, A., & Phillips, S. (2022). Spectroscopic confirmation of a gravitationally lensed Lyman-break galaxy at z_{[C ii]}= 6.827 using NOEMA. Monthly Notices of the Royal Astronomical Society, 512(1), 535-543. https://doi.org/10.1093/mnras/stac557

@article{5687efab19e84757acff972aa6523129,

title = "Spectroscopic confirmation of a gravitationally lensed Lyman-break galaxy at z[C ii]= 6.827 using NOEMA",

abstract = "We present the spectroscopic confirmation of the brightest known gravitationally lensed Lyman-break galaxy in the Epoch of Reionization (EoR), A1703-zD1, through the detection of [C ii] 158 μm at a redshift of z = 6.8269 ± 0.0004. This source was selected behind the strong lensing cluster Abell 1703, with an intrinsic luminosity and a very blue Spitzer/Infrared Array Camera (IRAC) [3.6]-[4.5] colour, implying high equivalent width line emission of [O iii] + Hβ. [C ii] is reliably detected at 6.1σ cospatial with the rest-frame ultraviolet (UV) counterpart, showing similar spatial extent. Correcting for the lensing magnification, the [C ii] luminosity in A1703-zD1 is broadly consistent with the local L[C,II]-star formation rate (SFR) relation. We find a clear velocity gradient of 103 ± 22 km s-1 across the source that possibly indicates rotation or an ongoing merger. We furthermore present spectral scans with no detected [C ii] above 4.6σ in two unlensed Lyman-break galaxies in the Extended Groth Strip (EGS)-Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) field at z ∼6.6-6.9. This is the first time that the Northern Extended Millimeter Array (NOEMA) has been successfully used to observe [C ii] in a 'normal' star-forming galaxy at z > 6, and our results demonstrate its capability to complement the Atacama Large Millimeter/submillimeter Array (ALMA) in confirming galaxies in the EoR.",

keywords = "galaxies: evolution, galaxies: formation, galaxies: high-redshift",

author = "Molyneux, {S. J.} and R. Smit and D. Schaerer and Bouwens, {R. J.} and L. Bradley and Hodge, {J. A.} and Longmore, {S. N.} and S. Schouws and {Van Der Werf}, P. and A. Zitrin and S. Phillips",

note = "Publisher Copyright: {\textcopyright} 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.",

year = "2022",

month = may,

day = "1",

doi = "10.1093/mnras/stac557",

language = "English",

volume = "512",

pages = "535--543",

journal = "Monthly Notices of the Royal Astronomical Society",

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Molyneux, SJ, Smit, R, Schaerer, D, Bouwens, RJ, Bradley, L, Hodge, JA, Longmore, SN, Schouws, S, Van Der Werf, P, Zitrin, A & Phillips, S 2022, 'Spectroscopic confirmation of a gravitationally lensed Lyman-break galaxy at z_{[C ii]}= 6.827 using NOEMA', Monthly Notices of the Royal Astronomical Society, vol. 512, no. 1, pp. 535-543. https://doi.org/10.1093/mnras/stac557

TY - JOUR

T1 - Spectroscopic confirmation of a gravitationally lensed Lyman-break galaxy at z[C ii]= 6.827 using NOEMA

AU - Molyneux, S. J.

AU - Smit, R.

AU - Schaerer, D.

AU - Bouwens, R. J.

AU - Bradley, L.

AU - Hodge, J. A.

AU - Longmore, S. N.

AU - Schouws, S.

AU - Van Der Werf, P.

AU - Zitrin, A.

AU - Phillips, S.

PY - 2022/5/1

Y1 - 2022/5/1

N2 - We present the spectroscopic confirmation of the brightest known gravitationally lensed Lyman-break galaxy in the Epoch of Reionization (EoR), A1703-zD1, through the detection of [C ii] 158 μm at a redshift of z = 6.8269 ± 0.0004. This source was selected behind the strong lensing cluster Abell 1703, with an intrinsic luminosity and a very blue Spitzer/Infrared Array Camera (IRAC) [3.6]-[4.5] colour, implying high equivalent width line emission of [O iii] + Hβ. [C ii] is reliably detected at 6.1σ cospatial with the rest-frame ultraviolet (UV) counterpart, showing similar spatial extent. Correcting for the lensing magnification, the [C ii] luminosity in A1703-zD1 is broadly consistent with the local L[C,II]-star formation rate (SFR) relation. We find a clear velocity gradient of 103 ± 22 km s-1 across the source that possibly indicates rotation or an ongoing merger. We furthermore present spectral scans with no detected [C ii] above 4.6σ in two unlensed Lyman-break galaxies in the Extended Groth Strip (EGS)-Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) field at z ∼6.6-6.9. This is the first time that the Northern Extended Millimeter Array (NOEMA) has been successfully used to observe [C ii] in a 'normal' star-forming galaxy at z > 6, and our results demonstrate its capability to complement the Atacama Large Millimeter/submillimeter Array (ALMA) in confirming galaxies in the EoR.

AB - We present the spectroscopic confirmation of the brightest known gravitationally lensed Lyman-break galaxy in the Epoch of Reionization (EoR), A1703-zD1, through the detection of [C ii] 158 μm at a redshift of z = 6.8269 ± 0.0004. This source was selected behind the strong lensing cluster Abell 1703, with an intrinsic luminosity and a very blue Spitzer/Infrared Array Camera (IRAC) [3.6]-[4.5] colour, implying high equivalent width line emission of [O iii] + Hβ. [C ii] is reliably detected at 6.1σ cospatial with the rest-frame ultraviolet (UV) counterpart, showing similar spatial extent. Correcting for the lensing magnification, the [C ii] luminosity in A1703-zD1 is broadly consistent with the local L[C,II]-star formation rate (SFR) relation. We find a clear velocity gradient of 103 ± 22 km s-1 across the source that possibly indicates rotation or an ongoing merger. We furthermore present spectral scans with no detected [C ii] above 4.6σ in two unlensed Lyman-break galaxies in the Extended Groth Strip (EGS)-Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) field at z ∼6.6-6.9. This is the first time that the Northern Extended Millimeter Array (NOEMA) has been successfully used to observe [C ii] in a 'normal' star-forming galaxy at z > 6, and our results demonstrate its capability to complement the Atacama Large Millimeter/submillimeter Array (ALMA) in confirming galaxies in the EoR.

KW - galaxies: evolution

KW - galaxies: formation

KW - galaxies: high-redshift

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DO - 10.1093/mnras/stac557

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