Determine spectral distortion models from flat field and arc lamp exposure.
esorex vmspcaldisp [OPTIONS] FILE.sof
This recipe is used to determine all the spectral distortions and transformations from an arc lamp exposure and a master flat field produced by the recipe vmspflat.
DO category: Type: Explanation: Required: MOS_ARC_SPECTRUM Raw Arc lamp exposure Y MASTER_BIAS Calib Master bias Y MASTER_DARK Calib Master dark .
MOS_MASTER_SCREEN_FLAT Calib Normalised flat field .
MOS_COMBINED_SCREEN_FLAT Calib Combined flat field .
GRISM_TABLE Calib Grism table Y LINE_CATALOG Calib Line catalog Y EXTRACT_TABLE Calib Extraction table .
CCD_TABLE Calib Bad pixel table .
DO category: Data type: Explanation: EXTRACT_TABLE FITS table Extraction table MOS_ARC_SPECTRUM_EXTRACTED FITS image Sky subtracted slit spectra (none) PAF Distortion models
At least one raw arc lamp exposure should be present in the input SOF.
The normalised and the combined flat fields are the products of the recipe vmspflat run on flat field data obtained with the same mask.
Neither of them is required for running vmspcaldisp, but if a combined flat field is not given then no spectral curvature model can be computed, and a first-guess is used in its place. A normalised master flat field needs to be specified only if a flat field correction is requested.
The bad pixel table needs to be specified only if the cleaning of bad pixels is requested.
An extraction table generated from previous runs might be input to the recipe, in order to iterate the modeling of the spectral distortions.
The grism table contains necessary information to control the way spectra are extracted and the determination of the distortion models.
The vmspcaldisp recipe gets from the grism table the wavelength that should be used as reference (header entry PRO WLEN CEN), and the spectrum extension in CCD pixels above and below the position of the reference wavelength (header entries PRO SPECT LLEN LO and PRO SPECT LLEN HI). Other parameters, used in the construction of the extracted arc lamp slit spectra, are the start and the end wavelength of the image containing the extracted spectra (header entries PRO WLEN START and PRO WLEN END), and the step of the sampling along the dispersion direction (header entry PRO WLEN INC).
The primary recipe product is the extraction table, that contains information about the local modelling of spectral distortions.
A secondary product of the vmspcaldisp recipe is the image of extracted slit spectra, that allows a visual check of the distortion models quality. A last product is the PAF file carrying all the information related to the spectral distortions. This PAF file is copied (or moved) to the product directory, and it is identical to the IWS configuration file MOS_wavecal_G_Q.cmf where Q indicates the VIMOS quadrant number, and G the grism name) that is created in the directory where vmspcaldisp is launched.
Bias removal method. (str; default: \'Zmaster\'). The full name of this option for the EsoRex configuration file is vimos.Parameters.bias.removing.method [default = Zmaster].
Extra pixels from expected position of spectrum edge in spectral extraction. (long; default: 10). The full name of this option for the EsoRex configuration file is vimos.Parameters.extraction.fuzz [default = 10].
Refine Inverse Dispersion Solution. (bool; default: False). The full name of this option for the EsoRex configuration file is vimos.Parameters.ids.refine [default = False].
Size of search window around expected arc line positions. (long; default: 10). The full name of this option for the EsoRex configuration file is vimos.Parameters.extraction.window [default = 10].
Flat field correction for input arc lamp frames. (bool; default: False). The full name of this option for the EsoRex configuration file is vimos.Parameters.flat.apply [default = False].
Bad pixel correction on arc lamp image. (bool; default: False). The full name of this option for the EsoRex configuration file is vimos.Parameters.badpixel.clean [default = False].
Cosmic ray events cleaning in arc lamp image. (bool; default: False). The full name of this option for the EsoRex configuration file is vimos.Parameters.cosmics.clean [default = False].
Arc line identification method. (str; default: \'FirstGuess\'). The full name of this option for the EsoRex configuration file is vimos.Parameters.line.ident.method [default = FirstGuess].
Threshold for peak detection. (float; default: 500.0). The full name of this option for the EsoRex configuration file is vimos.Parameters.line.ident.level [default = 500.0].
Arc lamp 2D extraction according to computed Local or Global IDS. (str; default: \'Local\'). The full name of this option for the EsoRex configuration file is vimos.Parameters.extraction [default = Local].
Model wavelength solution within each slit. (bool; default: True). The full name of this option for the EsoRex configuration file is vimos.Parameters.slit.model [default = True].
Order of polynomial for wavelength solution modeling within each slit. (long; default: 0). The full name of this option for the EsoRex configuration file is vimos.Parameters.slit.order [default = 0].
Compute QC1 parameters. (bool; default: True). The full name of this option for the EsoRex configuration file is vimos.Parameters.quality.enable [default = True].
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.
The full documentation for the vimos pipeline can be downloaded as a PDF file using the following URL:
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 vmifucombinecube(7), vmifucalib(7), vmimflatsky(7), vmspflat(7), vmmosobsstare(7), vmimflatscreen(7), vmimpreimaging(7), vmimcalphot(7), vmmoscombine(7), vmimstandard(7), vmmosobsjitter(7), vmifucombine(7), vmimobsjitter(7), vmspphot(7), vmdet(7), vmmosscience(7), vmmosstandard(7), vmifustandard(7), vmbias(7), vmmoscalib(7), vmimobsstare(7), vmdark(7), vmifuscience(7)
ESO VIMOS Pipeline Team and VIMOS Consortium <[email protected]>
This file is part of the VIMOS Instrument Pipeline Copyright (C) 2002-2005 European Southern Observatory
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