The second-generation z (redshift) and early universe spectrometer. I. First-light observation of a highly lensed local-ulirg analog at high-z

Carl Ferkinhoff, Drew Brisbin, Stephen Parshley, Thomas Nikola, Gordon J. Stacey, Justin Schoenwald, James L. Higdon, Sarah J.U. Higdon, Aprajita Verma, Dominik Riechers, Steven Hailey-Dunsheath, Karl M. Menten, Rolf Güsten, Axel Weiß, Kent Irwin, Hsiao M. Cho, Michael Niemack, Mark Halpern, Mandana Amiri, Matthew HasselfieldD. V. Wiebe, Peter A.R. Ade, Carol E. Tucker

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


We recently commissioned our new spectrometer, the second-generation z(Redshift) and Early Universe Spectrometer (ZEUS-2) on the Atacama Pathfinder Experiment telescope. ZEUS-2 is a submillimeter grating spectrometer optimized for detecting the faint and broad lines from distant galaxies that are redshifted into the telluric windows from 200 to 850 μm. It uses a focal plane array of transition-edge sensed bolometers, the first use of these arrays for astrophysical spectroscopy. ZEUS-2 promises to be an important tool for studying galaxies in the years to come because of its synergy with Atacama Large Millimeter Array and its capabilities in the short submillimeter windows that are unique in the post-Herschel era. Here, we report on our first detection of the [C II] 158 μm line with ZEUS-2. We detect the line at z ∼ 1.8 from H-ATLAS J091043.1-000322 with a line flux of (6.44 ± 0.42) × 10-18 W m-2. Combined with its far-IR luminosity and a new Herschel-PACS detection of the [O I] 63 μm line, we model the line emission as coming from a photo-dissociation region with far-ultraviolet radiation field, G ∼ 2 × 104 G 0, gas density, n ∼ 1 × 103 cm-3 and size between ∼0.4 and 1 kpc. On the basis of this model, we conclude that H-ATLAS J091043.1-000322 is a high-redshift analog of a local ultra-luminous IR galaxy; i.e., it is likely the site of a compact starburst caused by a major merger. Further identification of these merging systems is important for constraining galaxy formation and evolution models.

Original languageEnglish (US)
Article number142
JournalAstrophysical Journal
Issue number2
StatePublished - Jan 10 2014

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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