Kavli Affiliate: Luis C. Ho
| First 5 Authors: Tomonari Michiyama, Toshiki Saito, Kouichiro Nakanishi, Daisuke Iono, Ken-ichi Tadaki
| Summary:
We report the detection of [C I] $^3P_1$–$^3P_0$ emission in the nearby
galaxy NGC 7679 using the Atacama Compact Array (ACA) of the Atacama Large
Millimeter/submillimeter Array (ALMA). In Michiyama et al. (2021), [C I]
$^3P_1$–$^3P_0$ emission in NGC 7679 was reported as undetected based on ACA
observations conducted in 2019 (ALMA Cycle 6). These observations had ~1 minute
on-source time and used a single pointing with a field of view (FoV) of ~20
arcsec. In 2023 (Cycle 9), we carried out mosaic observations using seven
pointings with an FoV of ~27 arcsec and 4-5 minutes on-source per pointing. The
additional data have significantly improved the line sensitivity, uv-sampling,
and noise uniformity across the galaxy disk. Our Cycle 9 observations confirm
the presence of extended [C I] $^3P_1$–$^3P_0$ emission in NGC 7679, which was
completely missed in the Cycle 6 observations due to insufficient sensitivity
and uv-sampling. This highlights the basic technical challenges of estimating
the total flux by interferometric observations with sparse uv-sampling.
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