Updated Measurements of [O iii] 88 μm, [C ii] 158 μm, and Dust Continuum Emission from a z = 7.2 Galaxy

Ren, YW ORCID: 0000-0002-6510-5028, Fudamoto, Y ORCID: 0000-0001-7440-8832, Inoue, AK ORCID: 0000-0002-7779-8677, Sugahara, Y ORCID: 0000-0001-6958-7856, Tokuoka, T, Tamura, Y ORCID: 0000-0003-4807-8117, Matsuo, H ORCID: 0000-0003-3278-2484, Kohno, K ORCID: 0000-0002-4052-2394, Umehata, H ORCID: 0000-0003-1937-0573, Hashimoto, T ORCID: 0000-0002-0898-4038, Bouwens, RJ ORCID: 0000-0002-4989-2471, Smit, R ORCID: 0000-0001-8034-7802, Kashikawa, N ORCID: 0000-0003-3954-4219, Okamoto, T ORCID: 0000-0003-0137-2490, Shibuya, T and Shimizu, I ORCID: 0000-0001-5686-8368 (2023) Updated Measurements of [O iii] 88 μm, [C ii] 158 μm, and Dust Continuum Emission from a z = 7.2 Galaxy. Astrophysical Journal, 945 (1). ISSN 0004-637X

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Abstract

We present updated measurements of the [O iii] 88 μm, [C ii] 158 μm, and dust continuum emission from a star-forming galaxy at z = 7.212, SXDF-NB1006-2, by utilizing Atacama Large Millimeter/submillimeter Array (ALMA) archival data sets analysed in previous studies and data sets that have not been analysed before. The follow-up ALMA observations with higher angular resolution and sensitivity reveal a clumpy structure of the [O iii] emission on a scale of 0.32-0.85 kpc. We also combined all the ALMA [O iii] ([C ii]) data sets and updated the [O iii] ([C ii]) detection to 5.9σ (3.6σ-4.5σ). The non-detection of [C ii] with data from the REBELS large program implies the incompleteness of spectral-scan surveys using [C ii] to detect galaxies with high star formation rates (SFRs) but marginal [C ii] emission at high-z. The dust continuum at 90 and 160 μm remains undetected, indicating little dust content of <3.9 × 106 M ⊙ (3σ), and we obtained a more stringent constraint on the total infrared luminosity. We updated the [O iii]/[C ii] luminosity ratios to 10.2 ± 4.7 (6.1 ± 3.5) and 20 ± 12 (9.6 ± 6.1) for the 4.5σ and 3.6σ [C ii] detections, respectively, where the ratios in the parentheses are corrected for the surface brightness dimming effect on the extended [C ii] emission. We also found a strong [C ii] deficit (0.6-1.3 dex) between SXDF-NB1006-2 and the mean L [C II]−SFR relation of galaxies at 0 < z < 9.

Item Type:	Article
Uncontrolled Keywords:	0201 Astronomical and Space Sciences; 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics; 0306 Physical Chemistry (incl. Structural); Astronomy & Astrophysics
Subjects:	Q Science > QB Astronomy Q Science > QC Physics Q Science > QD Chemistry
Divisions:	Astrophysics Research Institute
Publisher:	American Astronomical Society
Date of acceptance:	1 February 2023
Date of first compliant Open Access:	15 June 2023
Date Deposited:	15 Jun 2023 13:27
Last Modified:	04 Jul 2025 18:15
DOI or ID number:	10.3847/1538-4357/acb8ab
URI:	https://researchonline.ljmu.ac.uk/id/eprint/19860

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