Spitzer imaging of i′‐drop galaxies: old stars at z≈ 6

  title={Spitzer imaging of i′‐drop galaxies: old stars at z≈ 6},
  author={Laurence Eyles and Andrew J. Bunker and Elizabeth R Stanway and Mark Lacy and Richard S. Ellis and Michelle Doherty University of Exeter and University of Wisconsin-Madison and Spitzer Science Center and Caltech Astronomy and Cambridge},
  journal={Monthly Notices of the Royal Astronomical Society},
  • L. Eyles, A. Bunker, Cambridge
  • Published 18 February 2005
  • Physics, Geology
  • Monthly Notices of the Royal Astronomical Society
We present new evidence for mature stellar populations with ages >100 Myr in massive galaxies (Mstellar > 1010 M⊙) seen at a time when the Universe was less than 1 Gyr old. We analyse the prominent detections of two z≈ 6 star-forming galaxies (SBM03#1 and #3) made at wavelengths corresponding to the rest-frame optical using the Infrared Array Camera camera onboard the Spitzer Space Telescope. We had previously identified these galaxies in Hubble Space Telescope (HST) Advanced Camera for Surveys… 
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