FIFI LS SITR December 2008. Randolf Klein (UCB) . Quick Summary. QA Issues and Mitigations. Ghost Images in Red Spectrometer – Minor Ghost images have been seen in the red spectrometer tests. The ghost images are spectrally very dilute.
FIFI LSSITRDecember 2008
Randolf Klein (UCB)
FIFI LS itself is funded by the MPE.
Time lapse movie of a line scan
Wavelength calibration for each individual pixel
Water line at 144.5 μm
Line fit for all pixels of the central module
Fit function: Lorentz function with offset
and linear and quadratic baseline
Characterization of FIFI LS : Measuring the LSF
A grating coarse scan => modestly sampled single pixel line scan
CO line at 153 µm (J: 17-16)
CO line at 163 µm (J: 16-15)
= central wavelength + correction for
assume: shrinking factor for g
+ const. angle offset from
position read out
wavelength values using the angles
from position read out.
sigma = 0.014 µm (1/10 Dl)
Characterization of FIFI LS : Doing the wavelength
FIFI LSEOOPExtended Observing Opportunity Program
Allowing the US community to use FIFI LS as if it were a facility instrument.
This is what we did 2-d: divide up the flux between 4 adjacent grid cells with weight factors defined by overlap areas
And this is the 3-d analogue: divide up the flux between 8 grid cells with weight factors defined by overlap volumes
162.812µm“Worm Holes” Through Cube
(Line is pressure broadened)
FIFI LS Instrument Overview