Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.1947d&link_type=abstract
Astronomical Journal v.109, p.1947
Astronomy and Astrophysics
Astronomy
3
Early Universe, Cosmology: Theory, Galaxies: Formation
Scientific paper
A technique is described to efficiently detect the Lyman break in a population of primeval galaxies using direct imaging and two specially tuned, intermediate-band filters. Compared to more popular narrow-band emission-line searches, this technique has a number of advantages which are demonstrated through simulations: It is sensitive to a redshift range over an order of magnitude greater (per filter pair), it is less sensitive to the explicit details of star/galaxy formation, and it is less sensitive to the effects of extinction. Although this technique is versatile and applicable to any formation redshift, it is argued that a Lyman break search might best be carried out at a redshift ~5 for a number of practical reasons which are discussed. Discrimination criteria are derived for this epoch which permit the unambiguous selection of primeval galaxies. Confusion between Lyman break objects and "contaminators"-older, more nearby continuum break galaxies, or objects for which a strong emission line falls into the redder bandpass-may be avoided by supplementing the data with Gunn r and i images. The technique remains robust even if primeval galaxies are internally reddened.
Derobertis Michael
McCall Marshall L.
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