Hα imaging of the candidate protogalaxy MS 1512-cB58

Jill Bechtold, H. K.C. Yee, Richard Elston, E. Ellinoson

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17 Scopus citations


We have obtained an image of the candidate protogalaxy MS 1512-cB58 through a narrow passband filter centered on Hα redshifted to z = 2.72. MS 1512-cB58 shows excess emission that is spatially extended, has a rest equivalent width of 56.7 Å, and luminosity of 3 × 1043 h-275 ergs s-1 (q0 = 0.1). Assuming that the excess emission arises from nebular Hα associated with H II regions, the observed luminosity implies a star formation rate of 285 M yr-1 (neglecting any possible magnification by gravitational lensing). By comparison, the luminosity of the stellar continuum at 1500 Å, along with models for the spectral energy distribution, indicate a star formation rate about a factor of 12 greater. We discuss plausible explanations for this discrepancy and possible future observations that may clarify the situation. 1997 The American Astronomical Society. All rights reserved.

Original languageEnglish (US)
Pages (from-to)L29-L32
JournalAstrophysical Journal
Issue number1 PART II
StatePublished - 1997


  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: individual (MS 1512-cB58)
  • Galaxies: starburst

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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