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vmmoscalib - Determination of the extraction mask

VMMOSCALIB(7) vimos recipes VMMOSCALIB(7)

NAME

vmmoscalib - Determination of the extraction mask
 

SYNOPSIS

esorex vmmoscalib [OPTIONS] FILE.sof
 

DESCRIPTION

This recipe is used to identify reference lines on MOS arc lamp exposures, and trace the spectral edges on the corresponding flat field exposures. This information is used to determine the spectral extraction mask to be applied in the scientific data reduction, performed with the recipe vimos_science. The input arc lamp and flat field exposures are assumed to be obtained quasi-simultaneously, so that they would be described by exactly the same instrument distortions.
A line catalog must be specified, containing the wavelengths of the reference arc lamp lines used for the wavelength calibration. A grism table (typically depending on the instrument mode, and in particular on the grism used) may also be specified: this table contains a default recipe parameter setting to control the way spectra are extracted for a specific instrument mode, as it is used for automatic run of the pipeline on Paranal and in Garching. If this table is specified, it will modify the default recipe parameter setting, with the exception of those parameters which have been explicitly modifyed on the command line.
If a grism table is not specified, the input recipe parameters values will always be read from the command line, or from an esorex configuration file if present, or from their generic default values (that are rarely meaningful). Finally a master bias frame must be input to this recipe.
In the table below the MOS_CURV_COEFF, MOS_CURV_TRACES, MOS_SPATIAL_MAP MOS_ARC_SPECTRUM_EXTRACTED, MOS_SPECTRA_DETECTION, MOS_SLIT_MAP, and MOS_SLIT_LOCATION, are never created in case of long-slit-like data.
The products MOS_SPECTRA_DETECTION, MOS_SLIT_MAP, and MOS_DISP_RESIDUALS, are just created if the --check parameter is set to true. The product GLOBAL_DISTORTION_TABLE is just created if more than 12 separate spectra are found in the CCD.
Input files:
 

DO category: Type: Explanation: Required:
MOS_SCREEN_FLAT Raw Flat field exposures Y
MOS_ARC_SPECTRUM Raw Arc lamp exposure Y
MASTER_BIAS Calib Bias frame Y
LINE_CATALOG Calib Line catalog Y
CONFIG_TABLE Calib Grism table .
Output files:
 

DO category: Data type: Explanation:
MOS_COMBINED_SCREEN_FLAT FITS image Combined (sum) flat field
MOS_MASTER_SCREEN_FLAT FITS image Normalised flat field
MOS_ARC_SPECTRUM_EXTRACTED FITS image Wavelength calibrated arc spectrum
MOS_DISP_COEFF FITS table Inverse dispersion coefficients
MOS_DISP_RESIDUALS FITS image Residuals in wavelength calibration
MOS_DISP_RESIDUALS_TABLE FITS table Residuals in wavelength calibration
MOS_DELTA_IMAGE FITS image Offset vs linear wavelength calib
MOS_WAVELENGTH_MAP FITS image Wavelength for each pixel on CCD
MOS_SPECTRA_DETECTION FITS image Check for preliminary detection
MOS_SLIT_MAP FITS image Map of central wavelength on CCD
MOS_CURV_TRACES FITS table Spectral curvature traces
MOS_CURV_COEFF FITS table Spectral curvature coefficients
MOS_SPATIAL_MAP FITS image Spatial position along slit on CCD
MOS_SPECTRAL_RESOLUTION FITS table Resolution at reference arc lines
MOS_SLIT_LOCATION FITS table Slits on product frames and CCD
GLOBAL_DISTORTION_TABLE FITS table Global distortions 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 vimos.vmmoscalib.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 vimos.vmmoscalib.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 vimos.vmmoscalib.wdegree [default = 0].
--wradius <long>
Search radius if iterating pattern-matching with first-guess method (pixel) (long; default: 4). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.wradius [default = 4].
--wreject <float>
Rejection threshold in dispersion relation fit (pixel) (float; default: 1.0). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.wreject [default = 1.0].
--wmodelss <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 vimos.vmmoscalib.wmodelss [default = 2].
--wmodemos <long>
Interpolation mode of wavelength solution (0 = no interpolation, 1 = local (slit) solution, 2 = global model) (long; default: 1). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.wmodemos [default = 1].
--ignore_lines <str>
Catalog lines nearest to wavelengths in this list will be ignored for wavelength calibration (str; default: ´´). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.ignore_lines [default = ].
--used_linesets <str>
Linesets to use. Valid are ´standard´ and´extended´ (see column LINE_SET in the line catalogue) (str; default: ´standard´). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.used_linesets [default = standard].
--cdegree <long>
Degree of spectral curvature polynomial (long; default: 0). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.cdegree [default = 0].
--cmode <long>
Interpolation mode of curvature solution applicable to MOS-like data (0 = no interpolation, 1 = fill gaps, 2 = global model) (long; default: 1). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.cmode [default = 1].
--startwavelength <float>
Start wavelength in spectral extraction (float; default: 0.0). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.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 vimos.vmmoscalib.endwavelength [default = 0.0].
--reference <float>
Reference wavelength for slit map (float; default: 0.0). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.reference [default = 0.0].
--slit_ident <bool>
Attempt slit identification.For multiplexing data slit identification is always performed. Switching it off will cause systematic errors in the absolute flux calibration if the FLAT_SED correction is used (see pipeline manual for details) (bool; default: True). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.slit_ident [default = True].
--s_degree <long>
Polynomial degree for the flat field fitting along spatial direction (long; default: -1). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.s_degree [default = -1].
--sradius <long>
Smooth box radius for flat field along spatial direction (used if s_degree < 0) (long; default: -1). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.sradius [default = -1].
--d_nknots <long>
Number of knots in flat field fitting splines along dispersion direction (long; default: -1). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.d_nknots [default = -1].
--dradius <long>
Smooth box radius for flat field along dispersion direction (if d_knots < 0) (long; default: 10). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.dradius [default = 10].
--fit_threshold <float>
Threshold percentage for flat spline fitting with respect to the maximum (float; default: 0.01). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.fit_threshold [default = 0.01].
--line_ident_tol <float>
Tolerance for the ratio of detected lines vs reference lines. This is used during for arc line identification. (float; default: 0.05). The full name of this option for the EsoRex configuration file is vimos.vmmoscalib.line_ident_tol [default = 0.05].
 
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.
 

SEE ALSO

The full documentation for the vimos pipeline can be downloaded as a PDF file using the following URL:
ftp://ftp.eso.org/pub/dfs/pipelines/vimos/vimos-pipeline-manual-6.9.pdf
An overview over the existing ESO pipelines can be found on the web page http://www.eso.org/sci/software/pipelines/.
Basic documentation about the EsoRex program can be found at the esorex (1) man page.
It is possible to call the pipelines from python using the python-cpl package. See http://packages.python.org/python-cpl/index.html for further information.
The other recipes of the vimos pipeline are vmbias(7), vmdark(7), vmdet(7), vmifucalib(7), vmifucombine(7), vmifucombinecube(7), vmifuscience(7), vmifustandard(7), vmimcalphot(7), vmimflatscreen(7), vmimflatsky(7), vmimobsjitter(7), vmimobsstare(7), vmimpreimaging(7), vmimstandard(7), vmmoscombine(7), vmmosobsjitter(7), vmmosobsstare(7), vmmosscience(7), vmmosstandard(7), vmspcaldisp(7), vmspflat(7), vmspphot(7)
 

VERSION

vmmoscalib 3.1.9
 

AUTHOR

Carlo Izzo <usd-help@eso.org>
 

BUG REPORTS

Please report any problems to usd-help@eso.org. Alternatively, you may send a report to the ESO User Support Department <usd-help@eso.org>.
 

LICENSE

This file is currently part of the VIMOS Instrument Pipeline Copyright (C) 2002-2006 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
 
3.1.9 vmmoscalib