Algorithms

Note

This page is still under construction!

Overview

FastSpecFit leverages our understanding of galaxies and quasars to build a physical model of their observed-frame optical spectra and UV/optical/IR spectral energy distributions (SEDs).

Simple Stellar Population Templates

Document the templates, physical properties, etc.

Modeling the Stellar Continuum

  • Initial line-sigma estimation.

  • Finding significant lines; masking.

  • Velocity dispersion (with criteria).

  • Aperture correction.

  • Smooth continuum correction.

  • No-photometry and photometry-only modes.

K-Corrections and Rest-Frame Photometry

  • K-corrections.

  • Default cosmology.

If the inverse variance on a given absolutely magnitude is zero it means that the absolute magnitude was derived from synthesized photometry based on the best-fitting model (i.e., use with care).

Modeling the Emission Lines

  • Line-fitting (broad, narrow).

  • Continuum, EWs, upper limits, etc.

Planned Improvements

  • Additional QSO templates.