University of Hertfordshire

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  • 107243

    Accepted author manuscript, 5.4 MB, PDF document

  • Chian Chou Chen
  • Ian Smail
  • A.M. Swinbank
  • J. M. Simpson
  • Cheng Jiun Ma
  • D.M. Alexander
  • A. D. Biggs
  • W.N. Brandt
  • S.C. Chapman
  • A. L. R. Danielson
  • H. Dannerbauer
  • A. C. Edge
  • T.R. Greve
  • R. J. Ivison
  • A. Karim
  • Karl M. Menten
  • E. Schinnerer
  • F. Walter
  • J. L. Wardlow
  • A. Weiß
  • P. P. Van Der Werf
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Original languageEnglish
Article number194
Number of pages28
JournalThe Astrophysical Journal
Volume799
Issue2
DOIs
Publication statusPublished - 1 Feb 2015

Abstract

We analyze Hubble Space Telescope WFC3/H160-band observations of a sample of 48 Atacama Large Millimeter/submillimeter Array detected submillimeter galaxies (SMGs) in the Extended Chandra Deep Field South field, to study their stellar morphologies and sizes. We detect 79% ± 17% of the SMGs in the H160-band imaging with a median sensitivity of 27.8mag, and most (80%) of the nondetections are SMGs with 870 μm fluxes of S870 < 3 mJy. with a surface brightness limit of μH ∼ 26 mag arcsec-2, we find that 82% ± 9% of the H160-band-detected SMGs at z = 1-3 appear to have disturbed morphologies, meaning they are visually classified as either irregulars or interacting systems, or both. By determining a Sérsic fit to the H160 surface brightness profiles, we derive a median Sérsic index of n = 1.2 ± 0.3 and a median half-light radius of re = 4.4-0.5 +1.1 kpc for our SMGs at z = 1-3. We also find significant displacements between the positions of the H160 component and 870 μm emission in these systems, suggesting that the dusty starburst regions and less-obscured stellar distribution are not colocated. We find significant differences in the sizes and the Sérsic index between our z = 2-3 SMGs and z ∼ 2 quiescent galaxies, suggesting that a major transformation of the stellar light profile is needed in the quenching processes if SMGs are progenitors of the red-and-dead z ∼ 2 galaxies. Given the short-lived nature of SMGs, we postulate that the majority of the z = 2-3 SMGs with S870 ≳ 2mJy are early/mid-stage major mergers.

ID: 9614096