H Imaging of the Candidate Protogalaxy MS 1512-cB58

Details H Imaging of the Candidate Protogalaxy MS 1512-cB58 H Imaging of the Candidate Protogalaxy MS 1512-cB58

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...477l..29b&link_type=abstract

Astrophysical Journal Letters v.477, p.L29

Astronomy and Astrophysics

Astronomy

20

Galaxies: Evolution, Galaxies: Individual Alphanumeric: Ms 1512-Cb58, Galaxies: Formation, Galaxies: Starburst

Scientific paper

We have obtained an image of the candidate protogalaxy MS 1512-cB58 through a narrow passband filter centered on H alpha redshifted to z = 2.72. MS 1512-cB58 shows excess emission that is spatially extended, has a rest equivalent width of 56.7 A, and luminosity of 3 x 1043 h^{-2}75 ergs s-1 (q0 = 0.1). Assuming that the excess emission arises from nebular H alpha associated with H II regions, the observed luminosity implies a star formation rate of 285 Msolar yr-1 (neglecting any possible magnification by gravitational lensing). By comparison, the luminosity of the stellar continuum at 1500 A, 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.

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