fors_wave_calib_lss7

Usage

Overview

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 <int>

Degree of wavelength calibration polynomial (int; default: 0). The full name of this option for the EsoRex configuration file is fors.fors_wave_calib_lss.wdegree [default = 0].

--wradius <int>

Search radius if iterating pattern-matching with first-guess method (int; 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 <int>

Interpolation mode of wavelength solution (0 = no interpolation, 1 = fill gaps, 2 = global model) (int; 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 5.5.6