paper

Optical-IR Spectral Energy Distribution of the Proto-Galaxy Candidate MS1512-cB58

arXiv:astro-ph/9605159 · doi:10.1086/310182

Abstract

The spectral energy distribution of the proto-galaxy candidate MS1512-cB58 at discovered by Yee et al. (1996) is presented. Photometry in seven bands ranging from to (1300--6000 Å~rest wavelength) are fitted with population synthesis models from Bruzual \& Charlot (1993). The data confirm a very young age for this galaxy, in agreement with ages estimated from preliminary \CIV~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 . 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 non-standard IMF and gravitational lensing on the galaxy's age and mass.

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