Other Sersic related functions

galaxy.morphology.centralIntensity(n: Union[int, float], re: float, Ie: Optional[float] = None, mag: Optional[float] = None, offset: Optional[float] = None) → float

Code author: Wilfried Mercier - IRAP <wilfried.mercier@irap.omp.eu>

Compute the central intensity of a given Sersic profile.

Parameters

• n (int or float) – Sersic index of the profile

• re (float) – half-light radius

• Ie (float) – (Optional) intensity at Re. If None, values for mag and offset must be given instead.

• mag (float) – (Optional) total magnitude. If None, Ie must be given instead.

• offset (float) – (Optional) magnitude offset. If None, Ie must be given instead

Returns

central intensity of the Sersic profile

Return type

float

Raises

ValueError – if Ie and mag and offset are None

galaxy.morphology.compute_R22(Red: Union[float, numpy.ndarray], dRed: Optional[Union[float, numpy.ndarray]] = None, b1: Optional[float] = None) → Union[float, numpy.ndarray]

Code author: Wilfried Mercier - IRAP <wilfried.mercier@irap.omp.eu>

Compute R22 (and its error) given an array of disk effective radii defined as

\[R_{22} = 2.2 \times R_{\rm{d}} / b_1,\]

where \(R_{\rm{d}}\) is the disk effective radius.

Parameters

• Red (float or ndarray[float]) – disk effective radii

• b1 (float) – (Optional) b1 factor appearing in the exponential disk profile

• dRed (float or ndarray[foat]) – (Optional) error estimate on the effective radii

Returns

R22 (and its error)

Return type

float or ndarray[float]