fors_align_sky_lss7

Usage

Overview

This recipe is used to align the wavelength solution based on the arc lamp exposure on a set of sky lines observed on a scientific exposure.

The input scientific frames are produced by the recipes fors_remove_bias and fors_flatfield. An input catalog of sky lines can be specified, or an internal one is used.

This recipe should be applied to LSS or long-slit like data (MOS/MXU with all slits at the same offset). For multi-slit MOS/MXU data use recipe fors_align_sky instead. Please refer to the FORS PIpeline User´s Manual for more details.

In the table below the MXU acronym can be alternatively read as MOS and LSS, and SCI as STD.

Input files:

DO category: Type: Explanation: Required:
SCIENCE_UNBIAS_MXU
or SCIENCE_UNFLAT_MXU
or STANDARD_UNBIAS_MXU
or STANDARD_UNFLAT_MXU Calib Frame with sky lines Y
DISP_COEFF_MXU Calib Dispersion solution Y
SLIT_LOCATION_MXU Calib Slit location on CCD Y
MASTER_SKYLINECAT Calib Catalog of sky lines .

GRISM_TABLE Calib Grism table .

Output files:

DO category: Data type: Explanation:
SKY_SHIFTS_LONG_SCI_MXU FITS table Observed sky lines offsets
WAVELENGTH_MAP_SCI_MXU FITS image Wavelength mapped on CCD
DISP_COEFF_SCI_MXU FITS image Upgraded dispersion solution

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_align_sky_lss.dispersion [default = 0.0].

--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_align_sky_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_align_sky_lss.endwavelength [default = 0.0].

--skyalign <int>

Polynomial order for sky lines alignment (int; default: 0). The full name of this option for the EsoRex configuration file is fors.fors_align_sky_lss.skyalign [default = 0].

--wcolumn <str>

Name of sky line catalog table column with wavelengths (str; default: ´WLEN´). The full name of this option for the EsoRex configuration file is fors.fors_align_sky_lss.wcolumn [default = WLEN].

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_align_sky_lss 5.5.6