SQUEAN (SED Camera for QUasars in EArly uNiverse) is an optical/near-infrared 1024 x 1024 (13 μm pixels) deep depletion CCD camera designed to search for quasar candidates in the early universe. It was built by the Seoul National University, Korea, and is available on the 2.1-m Otto Struve Telescope. The instrument has a FOV of 4.7 x 4.7 arcmin (Pixels are 0.276 arcsec/pix). SQUEAN is an updated version of the instrument previously known as CQUEAN.
The instrument characteristics can be summarized as:
Detector(s):
Deep depletion CCD providing enhanced quantum efficiency around 1 μm
Wavelength coverage:
Optimized for 0.7 - 1.1 μm. R-band observations work well with no aberrations.
Filters:
Nine medium-band (0.05 μm wide) filters cover the wavelength range 0.6 - 1.05 μm, spaced by 0.05 μm. In addition, SDSS g, r, i, z, Y, iz, and is, as well as Johnson-Cousin BVRI filters are available.
Throughput/sensitivity:
A 10 s exposure of a V=16 mag source yields a signal-to-noise in R-band of: 100
Read-out:
The readout time is 0.1-0.5 sec
Instrument paper
Sensitivity plot
User manual (In Development)
Instrument Contact
Teznie Pugh
- Superintendent
- McDonald Observatory
- Astronomy