Mapping the Youngest Galaxies to Redshift One

Details Mapping the Youngest Galaxies to Redshift One Mapping the Youngest Galaxies to Redshift One

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...20911208k&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #112.08; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

The study of low-metallicity galaxies provides important clues to the first stages of galaxy formation and chemical enrichment. In this program, we used data from narrowband surveys for high-z Lyα galaxies to discover and study very young, metal-poor galaxies at z < 1. Deep, wide-field, multi-wavelength images from Subaru/SuprimeCam, were used in combination with corresponding narrowband (NB816 and NB912) images to select over 500 strong emission-line galaxies (over roughly 1,800 arcmin2 in each filter bandpass). Subsequent Keck/DEIMOS spectroscopy of 161 of these revealed that this sample selects galaxies that have just undergone major starbursts (< 3 Myr). A dozen galaxies show [OIII]λ4363 auroral lines, suggesting very low metallicities ( Z ≈ 0.05 Z&sun;). We constructed the luminosity functions for these emission line galaxies at z = 0.2 - 0.8. Their high star formation rate (20 - 30 M&sun;/yr) makes them a significant contributor to cosmic star formation at z ≈ 1.

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