extracting.html
Extracting 2-D spectra
Before running extract-2dspec, we make sure the parameters are set properly:
editpar extract-2dspec ./extract-2dspec.par type q to end deltalam 2.037000 wavelength step deltaslit 0.200000 slit postion interval in arcseconds telscale 2.899000 telescope scale sec per mm search 0 half width of search region trace none spectrum trace method trace_order 3 order of fit to spectrum trace align none alignment method obj_frac 0.300000 fraction of galaxies used for alignment init_off 0.000000 initial object offset guess, in pixels minlambda 4800.000000 min wavelength of extraction maxlambda 7800.000000 max wavelength of extraction sub_ns n subtract shuffled region of n&s; data? sampling linear linear or log sampling edge 0 excluded edge of spectrum use_holes y extract alignment stars?Then we run the commands to generate the ift0009_2spec.fits and ift0010_2spec.fits, respectively.
extract-2dspec -m ift0012 -f ift0009_s extract-2dspec -m ift0012 -f ift0010_s
Finally, we can use sumspec to stack the spectra and do some cosmic ray cleaning. The following command will generate CSIfld5_2spec.fits:
sumspec -o CSIfld5_2spec ift0009 ift0010
Next: Viewing the Spectra Up: Reducing the Spectra Previous: Run Sky-Subtraction on the Science Exposures Contents
Edward Villanueva 2014-08-27