A dense, solar metallicity ISM in the z=4.2 dusty star-forming galaxy SPT0418-47. (arXiv:1909.12554v1 [astro-ph.GA])

A dense, solar metallicity ISM in the z=4.2 dusty star-forming galaxy SPT0418-47. (arXiv:1909.12554v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Breuck_C/0/1/0/all/0/1">Carlos De Breuck</a> (ESO), <a href="http://arxiv.org/find/astro-ph/1/au:+Weiss_A/0/1/0/all/0/1">Axel Weiss</a> (MPIfR), <a href="http://arxiv.org/find/astro-ph/1/au:+Bethermin_M/0/1/0/all/0/1">Matthieu Bethermin</a> (LAM), <a href="http://arxiv.org/find/astro-ph/1/au:+Cunningham_D/0/1/0/all/0/1">Daniel Cunningham</a> (Dalhousie), <a href="http://arxiv.org/find/astro-ph/1/au:+Apostolovski_Y/0/1/0/all/0/1">Yordanka Apostolovski</a> (Andres Bello), <a href="http://arxiv.org/find/astro-ph/1/au:+Aravena_M/0/1/0/all/0/1">Manuel Aravena</a> (Diego Portales), <a href="http://arxiv.org/find/astro-ph/1/au:+Archipley_M/0/1/0/all/0/1">Melanie Archipley</a> (Illinois), <a href="http://arxiv.org/find/astro-ph/1/au:+Chapman_S/0/1/0/all/0/1">Scott Chapman</a> (Dalhousie, NRC), <a href="http://arxiv.org/find/astro-ph/1/au:+Chen_C/0/1/0/all/0/1">Chian-Chou Chen</a> (ESO), <a href="http://arxiv.org/find/astro-ph/1/au:+Fu_J/0/1/0/all/0/1">Jianyang Fu</a> (Illinois), <a href="http://arxiv.org/find/astro-ph/1/au:+Jarugula_S/0/1/0/all/0/1">Sreevani Jarugula</a> (Illinois), <a href="http://arxiv.org/find/astro-ph/1/au:+Malkan_M/0/1/0/all/0/1">Matt Malkan</a> (UCLA), <a href="http://arxiv.org/find/astro-ph/1/au:+Mangian_A/0/1/0/all/0/1">Amelia C. Mangian</a> (Illinois), <a href="http://arxiv.org/find/astro-ph/1/au:+Phadke_K/0/1/0/all/0/1">Kedar A. Phadke</a> (Illinois), <a href="http://arxiv.org/find/astro-ph/1/au:+Reuter_C/0/1/0/all/0/1">Cassie A. Reuter</a> (Illinois), <a href="http://arxiv.org/find/astro-ph/1/au:+Stacey_G/0/1/0/all/0/1">Gordon Stacey</a> (Cornell), <a href="http://arxiv.org/find/astro-ph/1/au:+Strandet_M/0/1/0/all/0/1">Maria Strandet</a> (MPIfR), <a href="http://arxiv.org/find/astro-ph/1/au:+Vieira_J/0/1/0/all/0/1">Joaquin Vieira</a> (Illinois), <a href="http://arxiv.org/find/astro-ph/1/au:+Vishwas_A/0/1/0/all/0/1">Amit Vishwas</a> (Cornell)

We present a study of six far-infrared fine structure lines in the z=4.225
lensed dusty star-forming galaxy SPT0418-47 to probe the physical conditions of
its InterStellar Medium (ISM). In particular, we report Atacama Pathfinder
EXperiment (APEX) detections of the [OI]145um and [OIII]88um lines and Atacama
Compact Array (ACA) detections of the [NII]122 and 205um lines. The [OI]145um /
[CII]158um line ratio is ~5x higher compared to the average of local galaxies.
We interpret this as evidence that the ISM is dominated by photo-dissociation
regions with high gas densities. The line ratios, and in particular those of
[OIII]88um and [NII]122um imply that the ISM in SPT0418-47 is already
chemically enriched close to solar metallicity. While the strong gravitational
amplification was required to detect these lines with APEX, larger samples can
be observed with the Atacama Large Millimeter/submillimeter Array (ALMA), and
should allow to determine if the observed dense, solar metallicity ISM is
common among these highly star-forming galaxies.

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