Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7014e..68e&link_type=abstract
Ground-based and Airborne Instrumentation for Astronomy II. Edited by McLean, Ian S.; Casali, Mark M. Proceedings of the SPI
Astronomy and Astrophysics
Astronomy
Scientific paper
FLEX is a concept for a fully OH suppressed near infrared integral field spectrograph, being developed at the AAO. FLEX will be the first instrument to employ fibre Bragg gratings for OH suppression, a radical new technology which cleanly suppresses the atmospheric OH emission lines at 30dB whilst maintaining a high overall throughout of ~90%. In this paper we simulate the expected performance of FLEX, and discuss its impact on the science case. FLEX will effectively make the near-infrared sky 4 mags fainter in the H band and 3 mags fainter in the J band, offering unprecedentedly deep views of the near-infrared Universe. The FLEX concept is optimised for the identification of the sources of first light in the Universe - high redshift galaxies or quasars identified through Lyman-alpha emission or a Lyman break in the continuum spectrum. As such it will consist of a 2x2" integral field unit, composed of a 61 lenslet hexagonal array, feeding an existing moderate spectral resolution spectrograph, via an OH-suppression unit. We have simulated the performance of FLEX and show that it can provide robust identification of galaxies at the epoch of reionisation. A FLEX-like instrument on an ELT could measure the ionisation and enrichment of the inter-galactic medium beyond a redshift of 7 via metal absorption lines.
Bland-Hawthorn Joss
Ellis Simon C.
Haynes Roger
Horton Anthony
McGrath Andrew
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