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

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{sup –18} W m{sup –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 × 10{sup 4} G {sub 0}, gas density, n ∼ 1 × 10{sup 3} cm{sup –3} andmore » 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.« less
Authors:
; ; ; ; ; ;  [1] ; ;  [2] ;  [3] ;  [4] ; ; ;  [5] ; ;  [6] ;  [7] ; ;  [8] ;  [9] more »; « less
  1. Department of Astronomy, Cornell University, Ithaca, NY 14853 (United States)
  2. Department of Physics, Georgia Southern University, Statesboro, GA 30460 (United States)
  3. Department of Physics, University of Oxford, Oxford, OX1 3RH (United Kingdom)
  4. California Institute of Technology, Pasadena, CA 91125 (United States)
  5. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn (Germany)
  6. NIST Boulder, Boulder, CO 80305 (United States)
  7. Department of Physics, Cornell University, Ithaca, NY 14853 (United States)
  8. Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1 (Canada)
  9. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)
Publication Date:
OSTI Identifier:
22348239
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 780; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; BOLOMETERS; DENSITY; DETECTION; DISSOCIATION; EMISSION; FAR ULTRAVIOLET RADIATION; GALAXIES; GRAVITATIONAL LENSES; HERA STORAGE RING; LUMINOSITY; MULTIPARTICLE SPECTROMETERS; PARTICLE IDENTIFICATION; PERTURBED ANGULAR CORRELATION; RED SHIFT; SPECTROSCOPY; TELESCOPES; UNIVERSE; VISIBLE RADIATION