gelsa.galaxy_profiles

Functions

bulge(r, r50)	De Vaucouleurs profile
bulge_integrated(r, r50)	Cumulative integral of De Vaucouleurs profile
disk(r, r50)	Disk profile
disk_integrated(r, r50)	Cumulative integral of exponential disk profile

gelsa.galaxy_profiles.disk(r, r50)

Disk profile

Parameters:

• r (numpy.ndarray) – radius coordinate

• r50 (float) – half light radius of disk

Returns:

profile

Return type:

double

gelsa.galaxy_profiles.disk_integrated(r, r50)

Cumulative integral of exponential disk profile

Notes

The integrated profile is

\[F(x) = 1 - \left(1+x\right)e^{-x}\]

Parameters:

• r (numpy.ndarray) – radius coordinate

• r50 (float) – half light radius of disk

Returns:

profile

Return type:

double

gelsa.galaxy_profiles.bulge(r, r50)

De Vaucouleurs profile

Parameters:

• r (numpy.ndarray) – radius coordinate

• r50 (float) – half-light radius of bulge profile

Returns:

profile

Return type:

numpy.ndarray

gelsa.galaxy_profiles.bulge_integrated(r, r50)

Cumulative integral of De Vaucouleurs profile

Notes

The integrated profile is

\[F(x) = 1 - e^{-x} \left(1 + \sum_{i=1}^{7} \frac{x^{i}}{i!} \right)\]

Parameters:

• r (numpy.ndarray) – radius coordinate

• r50 (float) – half-light radius of bulge profile

Returns:

profile

Return type:

numpy.ndarray