Measurement of [OIII] Emission in Lyman Break Galaxies

Details Measurement of [OIII] Emission in Lyman Break Galaxies Measurement of [OIII] Emission in Lyman Break Galaxies

2000-05-11

arxiv.org/abs/astro-ph/0005254v1

Astronomy and Astrophysics

Astrophysics

25 pages, including 6 figures. Accepted for publication in ApJ

Scientific paper

10.1086/309539

Measurements of [OIII] emission in Lyman Break galaxies (LBGs) at z>3 are presented. Four galaxies were observed with narrow-band filters using the Near-IR Camera on the Keck I 10-m telescope. A fifth galaxy was observed spectroscopically during the commissioning of NIRSPEC, the new infrared spectrometer on Keck II. The emission-line spectrum is used to place limits on the metallicity. Comparing these new measurements with others available from the literature, we find that strong oxygen emission in LBGs may suggest sub-solar metallicity for these objects. The [OIII]5007 line is also used to estimate the star formation rate (SFR) of the LBGs. The inferred SFRs are higher than those estimated from the UV continuum, and may be evidence for dust extinction.

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