algorithms.rst

Algorithms

Note

This page is still under construction!

Contents

• Overview
• Simple Stellar Population Templates
• Modeling the Stellar Continuum
• K-Corrections and Rest-Frame Photometry
• Modeling the Emission Lines
• Planned Improvements

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.