Photometry related fonctions#

Code author: Hugo Plombat - LUPM <hugo.plombat@umontpellier.fr> & Wilfried Mercier - IRAP/LAM <wilfried.mercier@lam.fr> & Maxime Tarrasse - IRAP <Maxime.Tarrasse@irap.omp.eu>

Photometry functions.

pixSED.photometry.FluxToCount(flux: Union[float, ndarray, Quantity], eflux: Union[float, ndarray, Quantity], zeropoint: float) → Tuple[Union[float, ndarray], Union[float, ndarray]][source]#

Code author: Hugo Plombat - LUPM <hugo.plombat@umontpellier.fr> & Wilfried Mercier - IRAP <wilfried.mercier@irap.omp.eu>

Convert flux values and their associated error into dta count in \(\rm{e^{-}/s}\).

Parameters:

  • flux (float, ndarray [float] or Astropy Quantity) – flux in \(\rm{erg/cm^2/s/Hz}\). If provided as an Astropy Quantity it will be parsed to this unit.

  • eflux (float, ndarray [float] or Astropy Quantity) – std errors in \(\rm{erg/cm^2/s/Hz}\). If provided as an Astropy Quantity it will be parsed to this unit.

  • zeropoint (float) – zeropoint associated to the data

Returns:

data count in \(\rm{e^{-}/s}\) and associated error

Return type:

(float or ndarray [float], float or ndarray [float])

pixSED.photometry.MagTocount(mag: Union[float, ndarray], emag: Union[float, ndarray], zeropoint: float) → Tuple[Union[float, ndarray], Union[float, ndarray]][source]#

Code author: Maxime Tarrasse - IRAP <Maxime.Tarrasse@irap.omp.eu>

Converts magnitudes and their associated error into data counts and their associated errors.

Parameters:

  • mag (float or ndarray [float]) – AB magnitude

  • emag (float or ndarray [float]) – error on AB magnitudes

  • zeropoint (float) – zeropoint associated to the data

:returns : data in \(\rm{e^{-}/s}\) and associated errors :rtype: (float or ndarray [float], float or ndarray [float])

pixSED.photometry.countToFlux(data: Union[float, ndarray], err: Union[float, ndarray], zeropoint: float) → Tuple[Quantity, Quantity][source]#

Code author: Hugo Plombat - LUPM <hugo.plombat@umontpellier.fr> & Wilfried Mercier - IRAP <wilfried.mercier@irap.omp.eu>

Convert data counts and their associated error into flux in \(\rm{erg/cm^2/s/Hz}\).

Parameters:

  • data (float or ndarray [float]) – data in \(electron/s\)

  • err (float or ndarray [float]) – std errors in \(\rm{e^{-1}/s}\)

  • zeropoint (float) – zeropoint associated to the data

Returns:

flux in \(\rm{erg/cm^2/s/Hz}\) and associated error

Return type:

(Astropy Quantity, Astropy Quantity)

pixSED.photometry.countToMag(data: Union[float, ndarray], err: Union[float, ndarray], zeropoint: float) → Tuple[Union[float, ndarray], Union[float, ndarray]][source]#

Code author: Hugo Plombat - LUPM <hugo.plombat@umontpellier.fr> & Wilfried Mercier - IRAP <wilfried.mercier@irap.omp.eu>

Convert data counts and their associated error into AB magnitudes using the formula

\[d [{\rm{mag}}] = -2.5 \log_{10} d [{\rm{e^{-}/s}}] + {\rm{zpt}}\]

where \(d\) is the data and \(\rm{zpt}\) is the magnitude zeropoint. The error is given by

\[\Delta d [{\rm{mag}}] = 1.08 \Delta d [{\rm{e^{-}/s}}] / d [{\rm{e^{-}/s}}]\]
Parameters:

  • data (float or ndarray [float]) – data in \(\rm{e^{-1}/s}\)

  • err (float or ndarray [float]) – std errors in \(\rm{e^{-1}/s}\)

  • zeropoint (float) – zeropoint associated to the data

Returns:

AB magnitude and associated error

Return type:

(float or ndarray [float], float or ndarray [float]