Extinction in SESAMME¶
Eight extinction curves are currently implemented for SESAMME. All are implemented using either the extinction package by K. Barbary (https://extinction.readthedocs.io/en/latest/index.html) or the dust_extinction package by K. Gordon (https://dust-extinction.readthedocs.io/en/stable/index.html).
Model |
\(R_V\) |
Galaxy Type |
Reference |
Python source |
|---|---|---|---|---|
CCM |
3.1 |
MW |
https://ui.adsabs.harvard.edu/abs/1989ApJ…345..245C/abstract |
|
Fitzpatrick99 |
3.1 |
MW |
https://ui.adsabs.harvard.edu/abs/1999PASP..111…63F/abstract |
|
ODonnell |
3.1 |
MW |
https://ui.adsabs.harvard.edu/abs/1994ApJ…422..158O/abstract |
|
FitzMassa07 |
3.1 |
MW |
https://ui.adsabs.harvard.edu/abs/2007ApJ…663..320F/abstract |
|
Gordon23 |
3.1 |
MW |
|
|
Calzetti |
4.05 |
Starburst |
https://ui.adsabs.harvard.edu/abs/2000ApJ…533..682C/abstract |
|
SMC |
2.74 |
SMC |
https://ui.adsabs.harvard.edu/abs/2003ApJ…594..279G/abstract |
|
LMC |
3.41 |
LMC |
https://ui.adsabs.harvard.edu/abs/2003ApJ…594..279G/abstract |
|
Parameterizing Extinction¶
Although the SESAMME acronym lists extinction as one of the four variables it models, it is more accurate to say that it samples the line-of-sight reddening \(E(B-V)\), which can then be translated to an extinction or attenuation \(A_V\) after the fact. This conversion from \(E(B-V)\) to \(A_V\) depends on the chosen extinction curve and hence the assumed value of \(R_V\).
For details on how SESAMME applies reddening values to spectra, see the Model generation (sesamme.models) section of the API.