Computer Science – Performance
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342411b&link_type=abstract
American Astronomical Society, AAS Meeting #213, #424.11; Bulletin of the American Astronomical Society, Vol. 41, p.247
Computer Science
Performance
Scientific paper
We present a concept for BLISS, a sensitive far-IR-submillimeter spectrograph for SPICA. SPICA is a JAXA-led mission featuring a 3.5-meter telescope actively cooled to below 5K, envisioned for launch in 2017. The low-background platform is especially compelling for moderate-resolution survey spectroscopy, for which BLISS is designed. The BLISS / SPICA combination will offer line sensitivities below 1e-20 W/m^2 in modest integrations, enabling rapid survey spectroscopy of galaxies out to redshift 5. The far-IR fine-structure and molecular transitions which BLISS / SPICA will measure are immune to dust extinction, and will unambiguously reveal these galaxies' redshifts, stellar and AGN contents, gas properties, and heavy-element abundances. Taken together, such spectra will reveal the history of of star formation and AGN activity in dusty galaxies from 1 GY after the Big Bang to the present day.
BLISS is comprised of five sub-bands, each with two R 700 grating spectrometer modules. The modules are configured with polarizing and dichroic splitters to provide complete instantaneous spectral coverage in two sky positions. A chopping mirror modulates the source between these two sets of spectrometers. To approach background-limited performance with the cold telescope, BLISS detectors must have sensitivities below 1e-19 W/Hz^1/2, and the format is 10 arrays of several hundred pixels each. It is anticipated that these requirements can be met on SPICA's timescale with leg-isolated superconducting (TES) bolometers cooled with a 50 mK magnetic refrigerator.
Bliss-Spica Study Team
Bradford Charles
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