Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-07-31
Astronomy and Astrophysics
Astrophysics
TeX file, 21 pages + 11 figures and 3 tables (postscript), submitted to MNRAS
Scientific paper
The Lyman decrement associated with the cumulative effect of HI in QSO absorption systems along the line of sight provides a distinctive feature for identifying galaxies at z>2.5. The Hubble Deep Field (HDF) observations offer the opportunity to exploit the ubiquitous effect of intergalactic absorption and obtain useful statistical constraints on the redshift distribution of galaxies considerably fainter than current spectroscopic limits. We model the HI cosmic opacity as a function of redshift, including scattering in resonant lines of the Lyman series and Lyman-continuum absorption, and use stellar population synthesis models with a wide variety of ages, metallicities, dust contents, and redshifts, to derive color selection criteria that provide a robust separation between high redshift and low redshift galaxies. From the HDF images we construct a sample of star-forming galaxies at 2
Dickinson Mark Everett
Ferguson Henry C.
Fruchter Andrew
Giavalisco Mauro
Madau Piero
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