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Article
THE PHYSICAL SCALE OF THE FAR-INFRARED EMISSION IN THE MOST LUMINOUS SUBMILLIMETER GALAXIES
ASTROPHYSICAL JOURNAL
  • JD Younger
  • GG Fazio
  • DJ Wilner
  • MLN Ashby
  • R Blundell
  • MA Gurwell
  • JS Huang
  • D Iono
  • AB Peck
  • GR Petitpas
  • KS Scott
  • GW Wilson
  • Min Yun, University of Massachusetts - Amherst
Publication Date
2008
Abstract
We present high-resolution submillimeter interferometric imaging of two of the brightest high-redshift submillimeter galaxies known: GN 20 and AzTEC1 at 0.8'' and 0.3'' resolution, respectively. Our data—the highest resolution submillimeter imaging of high-redshift sources accomplished to date—were collected in three different array configurations: compact, extended, and very extended. We derive angular sizes of 0.6'' and 1.0'' for GN 20 and 0.3'' and 0.4'' for AzTEC1 from modeling their visibility functions as a Gaussian and an elliptical disk, respectively. Because both sources are B-band dropouts, they likely lie within a relatively narrow redshift window around z ~ 4, which indicates their angular extent corresponds to physical scales of 4-8 and 1.5-3 kpc, respectively, for the starburst region. By way of a series of simple assumptions, we find preliminary evidence that these hyperluminous starbursts—with star formation rates >1000 M yr−1—are radiating at or close to their Eddington limit. Should future high-resolution observations indicate that these two objects are typical of a population of high-redshift Eddington-limited starbursts, this could have important consequences for models of star formation and feedback in extreme environments.
Comments

This is the pre-published version harvested from ArXiv. The published version is located at http://iopscience.iop.org/0004-637X/688/1/59/

Pages
59-66
Citation Information
JD Younger, GG Fazio, DJ Wilner, MLN Ashby, et al.. "THE PHYSICAL SCALE OF THE FAR-INFRARED EMISSION IN THE MOST LUMINOUS SUBMILLIMETER GALAXIES" ASTROPHYSICAL JOURNAL Vol. 688 Iss. 1 (2008)
Available at: http://works.bepress.com/min_yun/19/