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Title: Selection and mid-infrared spectroscopy of ultraluminous star-forming galaxies at z ∼ 2

Starting from a sample of 24 μm sources in the Extended Groth Strip, we use 3.6-8 μm color criteria to select ultraluminous infrared galaxies (ULIRGs) at z ∼ 2. Spectroscopy from 20-38 μm of 14 objects verifies their nature and gives their redshifts. Multi-wavelength data for these objects imply stellar masses >10{sup 11} M {sub ☉} and star formation rates ≥410 M {sub ☉} yr{sup –1}. Four objects of this sample observed at 1.6 μm (rest-frame visible) with Hubble Space Telescope/WFC3 show diverse morphologies, suggesting that multiple formation processes create ULIRGs. Of the 14 objects, 4 show signs of active galactic nuclei, but the luminosity appears to be dominated by star formation in all cases.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Center for Astrophysics, University of Science and Technology of China, Anhui, 230026 (China)
  2. National Astronomical Observatories of China, Chinese Academy of Sciences, Beijing 100012 (China)
  3. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  4. Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093 (China)
Publication Date:
OSTI Identifier:
22348132
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 781; 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; ABSORPTION SPECTROSCOPY; COLOR; COSMOLOGY; GALAXIES; GALAXY NUCLEI; INFRARED SPECTRA; INTERMEDIATE INFRARED RADIATION; LUMINOSITY; MASS; PHOTOMETRY; RED SHIFT; SPACE; STARS; TELESCOPES; WAVELENGTHS