FSF

class mpdaf.MUSE.FSF(typ='MOFFAT1')

Bases: object

This class offers Field Spread Function models for MUSE.

Attributes

typ (string)

(FSF type.)

Manages LSF model.

Parameters:

typ : string

type of LSF

MOFFAT1: Moffat function with a FWHM which varies linearly with the

wavelength. Parameters:

• beta (float) Power index of the Moffat.
• a (float) constant in arcsec which defined the FWHM (fwhm=a+b*lbda)
• b (float) constant which defined the FWHM (fwhm=a+b*lbda)

Methods Summary

get_FSF(lbda, step, size, **kargs)	Return an array containing the FSF for a given wavelength.
get_FSF_cube(cube, size, **kargs)	Return a cube of FSFs corresponding to the MUSE data cube given as input: a FSF per MUSE spectral pixels, the step of the FSF pixel is equal to the spatial step of the MUSE data cube.

Methods Documentation

get_FSF(lbda, step, size, **kargs)

Return an array containing the FSF for a given wavelength.

Parameters:

lbda : float

Wavelength value in A.

step : float

Size of the pixel in arcsec.

size : integer

Number of pixels.

kargs : dict

kargs can be used to set FSF parameters.

Returns:

FSF : array (size, size)

MUSE FSF

fwhm_pix : float

fwhm of the FSF in pixels

fwhm_arcsec : array

fwhm of the FSF in arcsec

get_FSF_cube(cube, size, **kargs)

Return a cube of FSFs corresponding to the MUSE data cube given as input: a FSF per MUSE spectral pixels, the step of the FSF pixel is equal to the spatial step of the MUSE data cube.

Parameters:

cube : mpdaf.obj.Cube

MUSE data cube

size : integer

FSF size in pixels.

kargs : dict

kargs can be used to set FSF parameters.

Returns:

FSF : array (cube.shape[0], size, size)

Cube containing MUSE FSF (one per wavelength)

fwhm_pix : array(cube.shape[0])

fwhm of the FSF in pixels

fwhm_arcsec : array(cube.shape[0])

fwhm of the FSF in arcsec