Updated measurements of [O III] 88 $\mu$m, [C II] 158 $\mu$m, and Dust Continuum Emission from a z=7.2 Galaxy

Abstract

We present updated measurements of the [O III] 88 $\mu$m, [C II] 158 $\mu$m, 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 $0.32-0.85\mathrm{kpc}$. We also combined all the ALMA [O III] ([C II]) data sets and updated the [O III] ([C II]) detection to $5.9\sigma$ ($3.6\sigma -4.5\sigma$). 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 $\mu$m and 160 $\mu$m remains undetected, indicating little dust content of $<3.9\times 10^6{M}_{\odot }(3\sigma )$, and we obtained a more stringent constraint on the total infrared luminosity. We updated the [O III]/[C II] luminosity ratios to $10.2\pm 4.7(6.1\pm 3.5$) and $20\pm 12(9.6\pm 6.1$) for $4.5\sigma$ and $3.6\sigma$ [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 $L_{[\mathrm{CII}]}-\mathrm{SFR}$ relation of galaxies at $0<z<9$.

arXiv comment13 pages, 10 figures, 8 tables, published in ApJ

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Cited by in corpus (4)

• High resolution modeling of [CII], [CI], [OIII] and CO line emission from the ISM and CGM of a star forming galaxy at z ~ 6.5
• Infrared fine-structure lines at high redshift
• Detections of [C II] 158 $\mu$m and [O III] 88 $\mu$m in a Local Lyman Continuum Emitter, Mrk 54, and its Implications to High-redshift ALMA Studies
• A theoretical investigation of far-infrared fine structure lines at $z>6$ and of the origin of the [OIII]88/[CII]158 enhancement