Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-09-07
New Astron.Rev.50:53-57,2006
Astronomy and Astrophysics
Astrophysics
To appear in proceedings of UC Irvine May 2005 workshop on "First Light & Reionization", eds. E. Barton & A. Cooray, New Astro
Scientific paper
10.1016/j.newar.2005.11.028
We describe preliminary results from an ultra-sensitive, spectroscopic emission-line survey and illustrate the challenges inherent in identifying high-redshift LyA emitters. Our multi-slit windows technique complements other types of emission-line surveys. Narrowband imaging surveys cover large areas of sky but only detect much brighter objects. Longslit spectra taken along cluster caustics yield intrinsically fainter lensed LyA emitters but probe small volumes of space. We have observed the COSMOS deep field and a field at 15h +00. To a line flux of a few times 10^-18 erg/s/cm^2, we found 150 emission-line sources (with no detectable continuum) among 4 masks. These candidates are being re-observed with broad spectral coverage to determine the line identity. To date, the interloper to LyA ratio is about 8:1. The sky positions of the LyA candidates generally do not coincide with those of foreground objects in ultra-deep r band or i' images -- consistent with the presence of a strong Lyman break.
Dressler Alan
Martin Crystal L.
McCarthy Patrick. J.
Sawicki Marcin
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