Details

Autor(en) / Beteiligte

• De Breuck, Carlos
• Weiß, Axel
• Béthermin, Matthieu
• Cunningham, Daniel
• Apostolovski, Yordanka
• Aravena, Manuel
• Archipley, Melanie
• Chapman, Scott
• Chen, Chian-Chou
• Fu, Jianyang
• Jarugula, Sreevani
• Malkan, Matt
• Mangian, Amelia C.
• Phadke, Kedar A.
• Reuter, Cassie A.
• Stacey, Gordon
• Strandet, Maria
• Vieira, Joaquin
• Vishwas, Amit

Titel

A dense, solar metallicity ISM in the z = 4.2 dusty star-forming galaxy SPT 0418−47

Ist Teil von

• Astronomy and astrophysics (Berlin), 2019-11, Vol.631, p.A167

Ort / Verlag

Heidelberg: EDP Sciences

Erscheinungsjahr

2019

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• We present a study of six far-infrared fine structure lines in the z = 4.225 lensed dusty star-forming galaxy SPT 0418−47 to probe the physical conditions of its interstellar medium (ISM). In particular, we report Atacama Pathfinder EXperiment (APEX) detections of the [OI] 145 μm and [OIII] 88 μm lines and Atacama Compact Array (ACA) detections of the [NII] 122 and 205 μm lines. The [OI] 145 μm/[CII] 158 μm line ratio is ∼5× 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] 88 μm and [NII] 122 μm imply that the ISM in SPT 0418−47 is already chemically enriched to nearly 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 observers to determine if the dense, solar metallicity ISM is common among these highly star-forming galaxies.