Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005newar..49..354l&link_type=abstract
New Astronomy Reviews, v. 49, iss. 7-9 [SPECIAL ISSUE], p. 354-359.
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The Dark Energy Space Telescope (DESTINY) is an all-grism NIR 1.8 m survey camera optimized to return richly sampled Hubble diagrams of Type Ia and Type II supernovae (SN) over the redshift range 0.5 < z < 1.7, for determining cosmological distances, measuring the expansion rate of the universe as a function of time, and characterizing the nature of the so-called “dark energy” component of the universe. SN will be discovered by repeated imaging of a 7.5 square-degree area located at the north ecliptic poles. Grism spectra with resolving power λ/Δλ = R ˜ 75 will provide broad-band spectrophotometry, redshifts, SN classification, as well as valuable time-resolved diagnostic data for understanding the SN explosion physics. This methodology features only a single mode of operation with no time-critical interactions, a single detector technology, and a single instrument. Although grism spectroscopy is slow compared to SN detection in any single broad-band filter for photometry, or to conventional slit spectra for spectral diagnostics, the multiplex advantage of being able to observe a large field-of-view simultaneously over a full octave in wavelength makes this approach highly competitive.
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