Add position independent dust extinction to spectrum module

[philipp128]

Description

In order to fully model an observed galaxy catalogue, we need to include galactic extinction to our simulation. The extinction is defined as A_lambda = -2.5 log(F_lambda/F_lambda,0) The extinction is to be included after the redshifting of the spectrum. The reddened magnitude in band x is then given by m_x = -2.5 log(int{R_x F 10^[-0.4A_lambda] dlambda} / int{R_x F dlambda}), where F is the spectrum and R_x is the filter response.

Info

To calculate the extinction we should use the Astropy affiliated package dust_extinction. A good example of how to use it is given here. With example 1 and the beginning of example 3, everything needed should be explained.

Input

• template spectra

Outputs

• reddened band magnitudes of template spectra

References