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

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

Research output: Contribution to journalArticle

44 Citations (Scopus)

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)
JournalAstrophysical Journal
Volume466
Issue number2 PART II
StatePublished - 1996
Externally publishedYes

Fingerprint

protogalaxies
spectral energy distribution
galaxies
energy
star formation
confidence
photometry
bursts
IMF
stars
distribution
wavelength
synthesis
profiles
wavelengths
modeling

Keywords

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

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Optical-IR spectral energy distribution of the protogalaxy candidate MS 1512-cB58. / Ellingson, E.; Yee, H. K C; Bechtold, Jill; Elston, R.

In: Astrophysical Journal, Vol. 466, No. 2 PART II, 1996.

Research output: Contribution to journalArticle

Ellingson, E. ; Yee, H. K C ; Bechtold, Jill ; Elston, R. / Optical-IR spectral energy distribution of the protogalaxy candidate MS 1512-cB58. In: Astrophysical Journal. 1996 ; Vol. 466, No. 2 PART II.
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AU - Yee, H. K C

AU - Bechtold, Jill

AU - Elston, R.

PY - 1996

Y1 - 1996

N2 - 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.

AB - 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.

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