Top | Overview | For observers | Gallery | Technical detail | Publications | Data |
---|
Specifications
Observing modes
Mode | WIDE | HIRES-Y | HIRES-J |
---|---|---|---|
Wavelength coverage | 0.91 - 1.35 μm | 0.96 - 1.11 μm | 1.14 - 1.35 μm |
Spectral resolution | 28,000 | 70,000 [1] | |
Throughput | ~ 50% [2] | ~ 32% [2] | ~ 42% [2] |
Main disperser | Reflective echelle grating | Mosaicked high-blazed echelle grating | |
Array | 1.7 μm cut-off HAWAII-2RG | ||
Size | 1.75 m (L) × 1.07 m (W) × 0.50 m (H) |
[1] In the engineering observation on NTT, R∼55,000
[2] Including the throughput of optics and QE of the array.
Optical layout
Noise
The measured thermal background radiation reaching the array for various the ambient temperatures. The difference of plots shows different season. The solid line is a predicted flux with an assumption that the ambient environment is the block body. The dashed lines is the level of measured stray light in the cryostat.
Wavelength coverages
Wavelength coverages of all the WINERED modes superimposed on an atmospheric transmission curve.
Optical performances
A measurement result of the total throughput of WINERED WIDE-mode (filled circles) that does not include the slit loss. The solid line, dashed line, and dotted line are the model of atmospheric transmittance, the measured throughput of the 1.3-m Araki telescope, and the quantum efficiency of the array based on measurements by Teledein Inc., respectively.