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• W4311721893 abstract "We present ALMA deep spectroscopy for a lensed galaxy at $z_{rm spec}=8.496$ with $log(M_{rm star}/M_{odot})sim7.8$ whose optical nebular lines and stellar continuum are detected by JWST/NIRSpec and NIRCam Early Release Observations in SMACS0723. Our ALMA spectrum shows [OIII]88$mu$m and [CII]158$mu$m line detections at $4.0sigma$ and $4.5sigma$, respectively. The redshift and position of the [OIII] line coincide with those of the JWST source, while the [CII] line is blue-shifted by 90 km s$^{-1}$ with a spatial offset of $0.''5$ ($approx0.5$ kpc in source plane) from the JWST source. The NIRCam F444W image, including [OIII]$lambda$5007 and H$beta$ line emission, spatially extends beyond the stellar components by a factor of $>8$. This indicates that the $z=8.5$ galaxy has already experienced strong outflows whose oxygen and carbon produce the extended [OIII]$lambda$5007 and the offset [CII] emission, which would promote ionizing photon escape and facilitate reionization. With careful slit-loss corrections and removals of emission spatially outside the galaxy, we evaluate the [OIII]88$mu$m/$lambda$5007 line ratio, and derive the electron density $n_{rm e}$ by photoionization modeling to be $220^{+170}_{-100}$ cm$^{-3}$, which is comparable with those of $zsim2-3$ galaxies. We estimate an [OIII]88$mu$m/[CII]158$mu$m line ratio in the galaxy of $>4$, as high as those of known $zsim6-9$ galaxies. This high [OIII]88$mu$m/[CII]158$mu$m line ratio is generally explained by the high $n_{rm e}$ as well as the low metallicity ($Z_{rm gas}/Z_{odot}=0.04^{+0.02}_{-0.02}$), high ionization parameter ($log U > -2.27$), and low carbon-to-oxygen abundance ratio ($log$(C/O) $=[-0.52:-0.24]$) obtained from the JWST/NIRSpec data; further [CII] follow-up observations will constrain the covering fraction of photodissociation regions." @default.
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• W4311721893 date "2022-12-13" @default.
• W4311721893 modified "2023-09-23" @default.
• W4311721893 title "JWST and ALMA Multiple-Line Study in and around a Galaxy at $z=8.496$: Optical to FIR Line Ratios and the Onset of an Outflow Promoting Ionizing Photon Escape" @default.
• W4311721893 doi "https://doi.org/10.48550/arxiv.2212.06863" @default.
• W4311721893 hasPublicationYear "2022" @default.
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