GMOS Data Reduction

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gsreducegsreduce @objfiles_460 logfile=gmos.logfile fl_inter+rawpath=rawdata$ fl_over+ fl_trim+ nbiascontam=4fl_bias+ bias=“Bias.fits” fl_dark- fl_flat+flatim=“Flat_460.fits” fl_gmosaic+ fl_fixpix+ fl_cut+fl_gsappwave+ ovs_flinter+ ovs_fun=“chebyshev”ovs_order=3 fl_vardq+ mdfdir=rawdir$mdffile=MDFfilename.fits yoffset=5.0@objfiles_460: text file containing list of science data file namesfl_flat+: apply flat correction (Flat_460.fits is the flat-field file)fl_gmosaic+: mosaic detectors togetherfl_fixpix+: interpolate across chip gaps (if gmosaic+)fl_gsappwave-: do not apply a first order wavelength solution based on the headerfl_cut+: cut the slit spectra into separate extensions (superfluous for longslit)mdfdir/file: name of directory location and name of fits file containing slit-maskdefinition (required if fl_cut+)ovs_flinter+: examine fits to overscan region interactively
<strong>GMOS</strong> MOS reductionThe yoffset parameter adjusts the vertical positions of the slitspectra, in case gscut doesn’t cut the spectra correctly. Valuefor yoffset determined through inspection of gsreduced images.If dealing with faint spectra in the blue, you may want to use thearc spectra to determine offsetsWrong cutyoffset-adjusted cut
Page 1 and 2: Reducing GMOSSpectroscopic dataRica
Page 3 and 4: General Principles• Record everyt
Page 5: Notes on Bias and Dark• Standard
Page 8 and 9: Overscan “Spillover”R400 gratin
Page 10: Reduced combined 2x1 biasimage, con
Page 13 and 14: Difference image of two reduced sta
Page 15 and 16: Flatfield Correction• Flats may b
Page 17 and 18: gsflatgsflat @flatfiles_460 out=Fla
Page 19 and 20: gsflatFitting the overscan region:
Page 21 and 22: gsflatFitting the “response” fu
Page 23 and 24: gsflatλRed flat field along the sp
Page 25 and 26: gsflatThere is a trade off between,
Page 27: Alignment starsGMOS MOS Spectra
Page 31 and 32: gswavelengthgswavelenth @gsNarcfile
Page 33 and 34: gswavelengthDetermine wavelength so
Page 35 and 36: gswavelengthAutomatic line identifi
Page 37 and 38: gswavelengthFinding the wavelength
Page 39 and 40: gswavelengthOutput after fitting wa
Page 41 and 42: gswavelengthFinding the 2D waveleng
Page 43 and 44: gstransformgstransform gsNarcfile.f
Page 45 and 46: gsextractgsextract @tgsNsciencefile
Page 48 and 49: Raw Longslit N&SSpectrum
Page 50 and 51: Observing Tool N&SComponent2010B
Page 52 and 53: N&S Dark Correction• N&S darks ta
Page 54 and 55: Overscan fit for CCD1. By utilizing
Page 56 and 57: Zoom of reduced spectral image wher
Page 58 and 59: Flatfield Correction• GCALflats f
Page 60 and 61: Final normalized spectral image. Mi
Page 62 and 63: N&S Sky Subtraction• Sky subtract
Page 64 and 65: Bias corrected, dark subtracted, fl
Page 66: Bias Correction• Not talking abou

GMOS Data Reduction

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