vmmoscombine7

Usage

Overview

This recipe is used to sum the contributes from a sequence of 2D-extracted spectral frames generated by the recipes vmmosobsstare, vmmosobsjitter, and vmmoscombine itself. The only restriction is that all frames must be obtained with the same mask. Sky subtraction, fringing correction, flat fielding, etc., are not applied, since they had been applied in the previous reduction of each input dataset.

Each input image is corrected to airmass zero before the stacking, and for this reason an atmospheric extinction table must always be specified. Optionally a correction for the instrument response can also be applied.

Input files:

DO category: Type: Explanation: Required:
MOS_SCIENCE_EXTRACTED Product Combined slit spectra Y
GRISM_TABLE Calib Grism table Y
EXTINCT_TABLE Calib Atmospheric extinction Y
MOS_SPECPHOT_TABLE Calib Response curve .

Output files:

DO category: Data type: Explanation:
MOS_SCIENCE_REDUCED FITS image Extracted objects spectra
MOS_SCIENCE_FLUX_REDUCED FITS image Flux calibrated objects spectra
MOS_SCIENCE_EXTRACTED FITS image Combined slit spectra
OBJECT_TABLE FITS table Objects spectra identification
WINDOW_TABLE FITS table Objects positions in slit

The positions of the extracted slit spectra and of the detected objects that they may contain are listed in the window table.

If a spectro-photometric table (produced by the recipe vmmosstandard) is specified and a flux calibration is requested, then a MOS_SCIENCE_FLUX_REDUCED image is also created. This image is identical to the MOS_SCIENCE_REDUCED, but the spectra it contains are flux calibrated, and expressed in units of erg/cm/cm/s/Angstrom.

For more details, please refer to the VIMOS Pipeline User´s Guide.

Options

--StackMethod <str>

Frames combination method (str; default: ´Average´). The full name of this option for the EsoRex configuration file is vimos.Parameters.stacking.method [default = Average].

--KSigmaLow <float>

Low threshold for K-sigma clipping method. (float; default: 5.0). The full name of this option for the EsoRex configuration file is vimos.Parameters.stacking.ksigma.low [default = 5.0].

--KSigmaHigh <float>

High threshold for K-sigma clipping method. (float; default: 5.0). The full name of this option for the EsoRex configuration file is vimos.Parameters.stacking.ksigma.high [default = 5.0].

--MinRejection <int>

Number of lowest rejected values for rejection method. (int; default: 1). The full name of this option for the EsoRex configuration file is vimos.Parameters.stacking.minmax.minimum [default = 1].

--MaxRejection <int>

Number of highest rejected values for rejection method. (int; default: 1). The full name of this option for the EsoRex configuration file is vimos.Parameters.stacking.minmax.maximum [default = 1].

--DetectionLevel <float>

Object detection level in units of sigma. (float; default: 2.0). The full name of this option for the EsoRex configuration file is vimos.Parameters.detection.sigma [default = 2.0].

--WatershedLevels <int>

Number of levels in the watershed method in object detection. (int; default: 32). The full name of this option for the EsoRex configuration file is vimos.Parameters.detection.levels [default = 32].

--WatershedFraction <float>

Flux fraction to use in watershed. (float; default: 0.01). The full name of this option for the EsoRex configuration file is vimos.Parameters.detection.fraction [default = 0.01].

--MinObjectSize <int>

Minimal size for an object candidate to be considered an object. (int; default: 2). The full name of this option for the EsoRex configuration file is vimos.Parameters.detection.minsize [default = 2].

--MaxObjectSize <int>

Maximal size for an object candidate for not trying deblend into sub- objects. (int; default: 7). The full name of this option for the EsoRex configuration file is vimos.Parameters.detection.maxsize [default = 7].

--CalibrateFlux <bool>

Extracted spectra are flux calibrated. (bool; default: False). The full name of this option for the EsoRex configuration file is vimos.Parameters.flux.calibration [default = False].

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

vmmoscombine 3.2.3