Spectra¶
Synthesizer enables the generation of multiple different spectra which are associated with galaxies (Galaxy objects) or their components. The flowchart below shows how these different spectra are generated by different components. Full details on each component are provided below.
Components¶
incident
spectra are the spectra that serve as an input to the photoionisation modelling. In the context of stellar population synthesis these are the spectra that are produced by these codes and equivalent to the “pure stellar” spectra.transmitted
spectra is the incident spectra that is transmitted through the gas in the photoionisation modelling. Functionally the main difference betweentransmitted
andincident
is that thetransmitted
has little flux below the Lyman-limit, since this has been absorbed by the gas. This depends onfesc
.nebular
is the nebular continuum and line emission predicted by the photoionisation model. This depends onfesc
.reprocessed
is the emission which has been reprocessed by the gas. This is the sum ofnebular
andtransmitted
emission.escaped
is the incident emission that escapes reprocessing by gas. This isfesc * incident
. This is not subsequently affected by dust.intrinsic
is the sum of theescaped
andreprocessed
emission, essentially the emission before dust attenuated.attenuated
is thereprocessed
emission with attenuation by dust.emergent
is the combined emission including dust attenuation and is the sum ofreprocessed_attenuated
andescaped
. NOTE: this does not include thermal dust emission, so is only valid from the UV to near-IR.dust
is the thermal dust emission calculated using an energy balance approach, and assuming a dust emission model.total
is the sum ofattenuated
anddust
, i.e. it includes both the effect of dust attenuation and dust emission.For two component dust models (e.g. Charlot & Fall 2000) we also generate the individual spectra of the young and old component. This includes
young_incident
,young_nebular
,young_attenuated
etc.young
andold
are equivalent tototal
for the young and old components.