2013ApJS..208....8M -
Astrophys. J., Suppl. Ser., 208, 8 (2013/September-0)
Giga-z: a 100,000 object superconducting spectrophotometer for LSST follow-up.
MARSDEN D.W., MAZIN B.A., O'BRIEN K. and HIRATA C.
Abstract (from CDS):
We simulate the performance of a new type of instrument, a Superconducting Multi-Object Spectrograph (SuperMOS), that uses microwave kinetic inductance detectors (MKIDs). MKIDs, a new detector technology, feature good quantum efficiency in the UVOIR, can count individual photons with microsecond timing accuracy, and, like X-ray calorimeters, determine their energy to several percent. The performance of Giga-z, a SuperMOS designed for wide field imaging follow-up observations, is evaluated using simulated observations of the COSMOS mock catalog with an array of 100,000 R_423 nm_= E/ΔE = 30 MKID pixels. We compare our results against a simultaneous simulation of LSST observations. In 3 yr on a dedicated 4 m class telescope, Giga-z could observe ~2 billion galaxies, yielding a low-resolution spectral energy distribution spanning 350-1350 nm for each; 1000 times the number measured with any currently proposed LSST spectroscopic follow-up, at a fraction of the cost and time. Giga-z would provide redshifts for galaxies up to z ~ 6 with magnitudes mi ≲ 25, with accuracy σ_Δz/(1 + z)_~ 0.03 for the whole sample, and σ_Δz/(1 + z)_~ 0.007 for a select subset. We also find catastrophic failure rates and biases that are consistently lower than for LSST. The added constraint on dark energy parameters for WL + CMB by Giga-z using the FoMSWG default model is equivalent to multiplying the LSST Fisher matrix by a factor of α = 1.27 (wp ), 1.53 (wa), or 1.98 (Δγ). This is equivalent to multiplying both the LSST coverage area and the training sets by α and reducing all systematics by a factor of 1/sqrt(α), advantages that are robust to even more extreme models of intrinsic alignment.
Abstract Copyright:
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Journal keyword(s):
dark energy - galaxies: distances and redshifts - gravitational lensing: weak - instrumentation: detectors - surveys - techniques: imaging spectroscopy
Simbad objects:
2
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