Looking at the Data

This page lists some tips and tools for looking at and interpreting the data at the telescope.

Imaging
  • Pixel Scale:
    • Blue: 0.120 arcsec/pixel
    • Red: 0.123 arcsec/pixel

Rough guide to locating features in the 2-D spectra
  • Blue Grating spectrum:
    • wavelength increases with increasing x.
    • centered at ~4410 angstroms.
    • 5577 OI auroral line at x=6410
    • linear dispersion ~ 0.5 angstroms/pix for unbinned spectra
  • Red spectrum:
    • wavelength decreases with increasing x.
    • centered at ~7730 angstroms.
    • 5577 OI auroral line at X= 6710.
    • linear dispersion ~ 0.8 angstroms/pix for unbinned spectra
  • Dichroic cuts off at 5650 angstroms
    • Blue is transmitted
    • Red is reflected

Non-linearity and saturation
  • For flats, keep counts per pixel under 50,000 ADU (see manual, 1% non-linear at 55,000 ADU).
  • Aim for per pixel counts of 30,000-40,000 for flats, as above that there is no gain in S/N as you are in the fixed pattern regime where poisson statistics no longer hold true.

-- OlgaKuhn - 26 Nov 2011
Topic revision: r5 - 12 Apr 2013, OlgaKuhn
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