An ALMA view of the interstellar medium of the z=4.77 lensed starburst SPT-S J213242-5802.9

Abstract

We present ALMA detections of the [NII] 205$\mu$m and CO(12-11) emission lines, and the tentative detection of [CI] ${}^3$P${}_1$ - ${}^3$P${}_0$ for the strongly lensed ($\mu$=5.7$\pm$0.5) dusty, star-forming galaxy SPT-S J213242-5802.9 (hereafter SPT2132-58) at z=4.77. The [NII] and CO(12-11) lines are detected at 11.5 and 8.5 $\sigma$ level, respectively, by our band-6 observations. The [CI] line is detected at 3.2 $\sigma$ after a re-analysis of existing band-3 data. The [CI] luminosity implies a gas mass of 3.8$\pm$1.2$\times$10${}^{10}$ M${}_{\odot }$, and consequently a very short depletion timescale of 34$\pm$13 Myr and a CO-luminosity-to-gas-mass conversion factor ${\alpha }_{\mathrm{CO}}$ of 1.0$\pm$0.3 M${}_{\odot }$ (K km s${}^{-1}$ pc${}^2$)${}^{-1}$. SPT2132-58 is an extreme starburst with an intrinsic star formation rate of 1100$\pm$200 M${}_{\odot }$/yr. We find a [CII]/[NII] ratio of 26$\pm$7, which is the highest reported at z$>$4. This suggests that SPT2132-58 hosts an evolved interstellar medium (0.5 Z${}_{\odot }$<Z<1.5 Z${}_{\odot }$), which may be dominated by photodissociation regions. The CO(2-1) and CO(5-4) transitions have lower CO-to-far-infrared ratios than local and high-redshift samples, while CO(12-11) is similar to these samples, suggesting the presence of an additional very excited component or an AGN.

5 pages, 5 figures, 1 table, Accepted by A&A (problem with numerical values in the abstract corrected in v2)

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