Pandeia Reference Data

Information about JWST reference data and how to find the source of the reference data from the reference data files is provided in this article.

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Types of reference data

The JWST ETC reference data folder contains a number of types of data, including:

  • Background spectra
  • Extinction spectra
  • Throughput files for JWST
  • Normalization bandpasses (except HST filters, in the Synphot data package)
  • PSF datasets, for all instrument configurations.
  • Source spectral definitions (most template and model grid spectra is in the Synphot data package)

Throughput files

The JWST throughput files are found in the Pandeia data directory at "$pandeia_refdata/jwst/". Each instrument is in its own subdirectory, along with general telescope and detector information. The origin of particular reference data can often be found in the "config.json" file within a directory. For example, in "$pandeia_refdata/jwst/miri/config.json", lines 1790–1831 show the source information as follows:

$pandeia_refdata/jwst/miri/config.json 
        "meta": {
            "author": {
                "2016-07-21": "T. E. Pickering",
                "2016-08-20": "Nicholas Earl",
                "2017-03-31": "N. Earl, B. Nickson, S. Kendrew",
                "2017-09-11": "B. Holler, S. Kendrew",
                "2017-11-15": "B. Holler, S. Kendrew",
                "2022-10-04": "B. Holler",
                "2022-10-12": "B. Holler",
                "2023-07-13": "B. Holler"
            },
            "history": {
                "2016-07-21": "Create initial template from pandeia config file",
                "2016-08-20": "Initial inclusion from published results.",
                "2017-03-31": "Updated saturation limit and removed quantum yield curve from the quantum efficiencies.",
                "2017-09-11": "Added ge_ar1_trans and ge_ar2_trans.",
                "2017-11-15": "Updated filter reference files to set throughput to 0 outside of the bandpass defined in this file.",
                "2022-10-04": "Updated list of reference files, updated MRS wavelength ranges",
                "2022-10-12": "Updated list of reference files",
                "2023-07-13": "Updated MRS blaze files to account for observed throughput decrease"
            },
            "litref": {
                "2016-07-21": "pandeia_data master",
                "2016-08-20": "None",
                "2017-03-31": "None",
                "2017-09-11": "None",
                "2017-11-15": "None",
                "2022-10-04": "JETC-2887, MIRI EC Report: MIR-COMM-TN-106",
                "2022-10-12": "JETC-2887, MIRI EC Report: MIR-COMM-TN-106",
                "2023-07-13": "None"
            },
            "pedigree": {
                "2016-07-21": "pandeia_data master",
                "2016-08-20": "ground",
                "2017-03-31": "ground",
                "2017-09-11": "ground",
                "2017-11-15": "ground",
                "2022-10-04": "INFLIGHT",
                "2022-10-12": "INFLIGHT",
                "2023-07-13": "INFLIGHT"
            }
        },

Spectral libraries

The spectral libraries used by Pandeia are also found in the reference data directory, inside the "$pandeia_refdata/sed" subdirectory.

General information can be found in "$pandeia_refdata/sed/config.json", while information about individual sources can be found at "$pandeia_refdata/sed/<type>/spectra.json", where "<type>" is an available spectrum type such as "brown2014" for the Brown et al. (2014) galaxy spectra.  With the exception of the "hst_calspec" spectra, all of the actual spectrum FITS files are in the Synphot dataset, and only configuration files that map names to filenames exist in the "$pandeia_refdata" directories.


References

Brown, M. J. I. et al. 2014, ApJS, 212, 18 
An Atlas of Galaxy Spectral Energy Distributions from the Ultraviolet to the Mid-Infrared



Notable updates
  •  
    Updated example meta data for ETC 4.0.
Originally published