vmmosstandard7

Usage

Overview

This recipe is used to calibrate and extract a standard star spectrum obtained in MOS mode, and compare it with a catalog spectrum to obtain the efficiency and the response curves.

Input files:

DO category: Type: Explanation: Required:
MOS_STANDARD Raw Science exposure Y
MASTER_BIAS Calib Master bias Y
EXTINCT_TABLE Calib Atmospheric extinction Y
STD_FLUX_TABLE Calib Standard star fluxes Y
MASTER_DARK Calib Master dark .

MOS_MASTER_SCREEN_FLAT Calib Normalised flat field .

EXTRACT_TABLE Calib Extraction table .

GRISM_TABLE Calib Grism table Y
CCD_TABLE Calib Bad pixel table .

Output files:

DO category: Data type: Explanation:
MOS_STANDARD_REDUCED FITS image Extracted spectrum
MOS_STANDARD_EXTRACTED FITS image Sky subtracted slit spectra
MOS_STANDARD_SKY FITS image Sky slit spectra
MOS_STANDARD_SKY_EXTRACTED FITS image Extracted sky spectrum
OBJECT_TABLE FITS table Objects spectra identification
WINDOW_TABLE FITS table Objects positions in slit
MOS_SPECPHOT_TABLE FITS table Efficiency and response curves

The standard star spectrum is calibrated and extracted as described for the recipe vmmosobsstare. The extracted spectrum is compared to catalog fluxes of the same star to obtain the efficiency curve and the response curve to use for flux calibration. For this comparison the extracted spectrum is converted into electrons/sec/Angstrom. The catalog fluxes, as well as the atmospheric extinction factors, are remapped to the same wavelength bins of the extracted spectrum. After removing the effect of the atmospheric extinction (i.e., correcting the extracted spectrum to airmass zero), the response curve is derived as the ratio between the catalog spectrum and the calibrated spectrum.

The efficiency curve is obtained by dividing the extracted spectrum in electrons/sec/Angstrom by the the catalog fluxes converted from erg/cm/cm/s/Angstrom to photons/s/Angstrom (at 100% efficiency each photon would correspond to one electron).

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

Options

--BiasMethod <str>

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].

--SkyMethod <str>

Sky level determination method. (str; default: ´Median´). The full name of this option for the EsoRex configuration file is vimos.Parameters.sky.method [default = Median].

--PolyOrder <int>

Degree of polynomial used when the SkyMethod is set to Fit. (int; default: 0). The full name of this option for the EsoRex configuration file is vimos.Parameters.sky.order [default = 0].

--SkyKSigmaLow <float>

Low threshold for K-sigma rejection in sky fitting. (float; default: 3.0). The full name of this option for the EsoRex configuration file is vimos.Parameters.sky.ksigma.low [default = 3.0].

--SkyKSigmaHigh <float>

High threshold for K-sigma rejection in sky fitting. (float; default: 3.0). The full name of this option for the EsoRex configuration file is vimos.Parameters.sky.ksigma.high [default = 3.0].

--Fuzz <int>

Extra pixels from expected position of spectrum edge in extraction. (int; default: 5). The full name of this option for the EsoRex configuration file is vimos.Parameters.extraction.fuzz [default = 5].

--SlitMargin <int>

Number of excluded pixels at slit ends in object search or in sky level determination. (int; default: 2). The full name of this option for the EsoRex configuration file is vimos.Parameters.detection.exclude [default = 2].

--LineWidth <int>

Size of spectrum to extract around any skyline. (int; default: 16). The full name of this option for the EsoRex configuration file is vimos.Parameters.sky.linewidth [default = 16].

--DetectionLevel <float>

Object detection level in units of sigma. (float; default: 10.0). The full name of this option for the EsoRex configuration file is vimos.Parameters.detection.sigma [default = 10.0].

--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].

--CleanBadPixel <bool>

Bad pixel correction on MOS science exposure. (bool; default: True). The full name of this option for the EsoRex configuration file is vimos.Parameters.badpixel.clean [default = True].

--HorneExtraction <bool>

Use 1D Horne extraction. (bool; default: False). The full name of this option for the EsoRex configuration file is vimos.Parameters.extraction.optimal [default = False].

--ModelSlit <bool>

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].

--ModelSlitOrder <int>

Order of polynomial for wavelength solution modeling within each slit. (int; default: 0). The full name of this option for the EsoRex configuration file is vimos.Parameters.slit.order [default = 0].

--UseSkylines <bool>

Use sky lines to refine the wavelength calibration (bool; default: True). The full name of this option for the EsoRex configuration file is vimos.Parameters.sky.align [default = True].

--ResponseOrder <int>

Order of the polynomial used to smooth the instrument response curve. (int; default: 5). The full name of this option for the EsoRex configuration file is vimos.Parameters.response.order [default = 5].

--ReduceAnyFrame <bool>

Reduce any frame. (bool; default: False). The full name of this option for the EsoRex configuration file is vimos.Parameters.reduceall [default = False].

--ComputeQC <bool>

Compute QC1 parameters (bool; default: True). The full name of this option for the EsoRex configuration file is vimos.Parameters.quality.enable [default = True].

--SelectSlit <int>

Slit containing the standard star. (int; default: 0). The full name of this option for the EsoRex configuration file is vimos.Parameters.slit.select [default = 0].

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

vmmosstandard 3.2.3