Optical-IR spectral energy distribution of the protogalaxy candidate MS 1512-cB58

E. Ellingson, H. K.C. Yee, Jill Bechtold, R. Elston

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Abstract

The spectral energy distribution of the protogalaxy candidate MS 1512-cB58 at z = 2.72 is presented. Photometry in seven bands ranging from g to K' (1300-6000 A rest wavelength) are fitted with population synthesis models. The data confirm a very young age for this galaxy in agreement with ages estimated from preliminary C IV λ1550 P Cygni profile modeling. Single-burst models with ages greater than about 20 Myr can be discarded at the 99% confidence level, and continuous star formation models with ages greater than about 35 Myr can be discarded at the 95% confidence level. The spectral energy distribution is most consistent with a continuous star formation model of about 10-20 Myr, with reddening of E(B-V) ∼ 0.3. No evidence for an older population of stars is seen, but the possibility of an older population with as much as 90% of the galaxy mass cannot be ruled out. We discuss the possible ramifications of a nonstandard IMF and gravitational lensing on the galaxy's age and mass.

Original languageEnglish (US)
Pages (from-to)L71-L74
JournalAstrophysical Journal
Volume466
Issue number2 PART II
StatePublished - Jan 1 1996

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Keywords

  • Galaxies: formation
  • Galaxies: photometry
  • Galaxies: starburst

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Ellingson, E., Yee, H. K. C., Bechtold, J., & Elston, R. (1996). Optical-IR spectral energy distribution of the protogalaxy candidate MS 1512-cB58. Astrophysical Journal, 466(2 PART II), L71-L74.