fors_wave_calib_lss(7) Derive dispersion relation from long-slit arc lamp frame

SYNOPSIS

esorex fors_wave_calib_lss [OPTIONS] FILE.sof

DESCRIPTION

This recipe is used to wavelength calibrate one long slit spectrum, i.e., a FORS spectral obtained either in LSS mode or in MOS/MXU mode with all slits at the same offset. A pattern-matching algorithm is applied as in recipe fors_detect_spectra. For more details on this data reduction strategy please refer to the FORS Pipeline User's Manual.

Note that specifying an input GRISM_TABLE will set some of the recipe configuration parameters to default values valid for a particular grism.

In the table below the LSS acronym can be alternatively read as MOS or MXU.

Input files:


  DO category:               Type:       Explanation:         Required:
  LAMP_UNBIAS_LSS            Calib       Arc lamp exposure       Y
  MASTER_LINECAT             Calib       Line catalog            Y
  GRISM_TABLE                Calib       Grism table             .

Output files:


  DO category:               Data type:  Explanation:
  REDUCED_LAMP_LSS           FITS image  Calibrated arc lamp exposure
  DISP_COEFF_LSS             FITS table  Inverse dispersion coefficients
  DISP_RESIDUALS_LSS         FITS image  Image of modeling residuals
  WAVELENGTH_MAP_LSS         FITS image  Wavelengths mapped on CCD
  SLIT_LOCATION_LSS          FITS image  Background subtracted arc frame
  SPECTRAL_RESOLUTION_LSS    FITS table  Spectral resolution table

OPTIONS

--dispersion <float>
Expected spectral dispersion (Angstrom/pixel) (float; default: 0.0). The full name of this option for the EsoRex configuration file is fors.fors_wave_calib_lss.dispersion [default = 0.0].
--peakdetection <float>
Initial peak detection threshold (ADU) (float; default: 0.0). The full name of this option for the EsoRex configuration file is fors.fors_wave_calib_lss.peakdetection [default = 0.0].
--wdegree <long>
Degree of wavelength calibration polynomial (long; default: 0). The full name of this option for the EsoRex configuration file is fors.fors_wave_calib_lss.wdegree [default = 0].
--wradius <long>
Search radius if iterating pattern-matching with first-guess method (long; default: 4). The full name of this option for the EsoRex configuration file is fors.fors_wave_calib_lss.wradius [default = 4].
--wreject <float>
Rejection threshold in dispersion relation fit (pixel) (float; default: 0.7). The full name of this option for the EsoRex configuration file is fors.fors_wave_calib_lss.wreject [default = 0.7].
--wcolumn <str>
Name of line catalog table column with wavelengths (str; default: 'WLEN'). The full name of this option for the EsoRex configuration file is fors.fors_wave_calib_lss.wcolumn [default = WLEN].
--startwavelength <float>
Start wavelength in spectral extraction (float; default: 0.0). The full name of this option for the EsoRex configuration file is fors.fors_wave_calib_lss.startwavelength [default = 0.0].
--endwavelength <float>
End wavelength in spectral extraction (float; default: 0.0). The full name of this option for the EsoRex configuration file is fors.fors_wave_calib_lss.endwavelength [default = 0.0].
--wmode <long>
Interpolation mode of wavelength solution (0 = no interpolation, 1 = fill gaps, 2 = global model) (long; default: 2). The full name of this option for the EsoRex configuration file is fors.fors_wave_calib_lss.wmode [default = 2].

Note that it is possible to create a configuration file containing these options, along with suitable default values. Please refer to the details provided by the 'esorex --help' command.

VERSION

fors_wave_calib_lss 5.3.5

AUTHOR

Carlo Izzo <[email protected]>

BUG REPORTS

Please report any problems to [email protected] Alternatively, you may send a report to the ESO User Support Department <[email protected]>.

LICENSE

This file is currently part of the FORS Instrument Pipeline Copyright (C) 2002-2010 European Southern Observatory

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA