FastSpecFit Spectral Synthesis and Emission-Line Catalog

Overview

FastSpecFit is a stellar continuum and emission-line modeling code for DESI which is optimized for speed and simplicity.

The code operates in two modes: fastspec uses physically motivated stellar population synthesis and emission-line templates to jointly model the three-camera optical spectrophotometry from DESI simultaneously with the ultraviolet through infrared broadband photometry.

Meanwhile, fastphot uses the same stellar population synthesis templates (fixed at the DESI redshift) to model just the ultraviolet through infrared broadband photometry.

For a complete description of FastSpecFit please refer to the complete documentation{: target=’_blank’}.

In this value-added catalog (VAC), we present the fastspec VAC; for the corresponding fastphot VAC, please see the FastPhot Spectral Synthesis Catalog documentation.

Data Organization & Access

All the details regarding the Iron (Data Release 1) and Guadalupe (Data Release 1 Supplement) VACs, including how to access the data, are documented at the following URLs:

https://fastspecfit.readthedocs.io/en/latest/iron.html https://fastspecfit.readthedocs.io/en/latest/guadalupe.html

In particular, please refer to the Notes & Known Issues{: target=’_blank’} section of the documentation to read the latest list of outstanding issues and/or known bugs regarding each version of these VACs (if any)

Data Model

The data model for the FastSpecFit VAC is documented at the following URL:

https://fastspecfit.readthedocs.io/en/latest/fastspec.html

Acknowledgments

Any use of these VACs or the FastSpecFit software product must abide by the acknowledgments documented at the following location:

https://fastspecfit.readthedocs.io/en/latest/acknowledgments.html

Contact

For questions or problems regarding these catalogs, please contact John Moustakas (Siena University).