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Fuji VAC (EDR)

Contents

Overview

This page describes the Fuji value-added catalog which was publicly released in December 2023 and is based on the DESI Early Data Release (DESI/EDR).

Please refer to the :ref:`acknowledgments` section for the conditions for using this VAC.

Note

We only document the latest version of this VAC here; please see below for information regarding :ref:`previous versions<previous versions - fuji>`.

Data Content & Access

Data from the Fuji VAC can be accessed at any of the following links:

Data url https://data.desi.lbl.gov/public/edr/vac/edr/fastspecfit/fuji/v3.1
Web-app (for collaborators) https://fastspecfit.desi.lbl.gov
NERSC (for collaborators) /global/cfs/cdirs/desi/public/edr/vac/edr/fastspecfit/fuji/v3.1

For more information regarding the content and organization of the VAC, please click on the following links:

Summary Statistics

The following table summarizes the size and number of targets in each merged catalog.

Note

The last catalog listed in the table is a super-merge of all the preceding catalogs, i.e., a merge over all surveys and programs.

.. rst-class:: columns
File Name File Size Number of Targets
fastspec-fuji-cmx-other.fits 12.8 MB 2,771
fastspec-fuji-special-dark.fits 161 MB 35,649
fastspec-fuji-sv1-backup.fits 17.1 MB 3,683
fastspec-fuji-sv1-bright.fits 579 MB 126,678
fastspec-fuji-sv1-dark.fits 1.05 GB 235,942
fastspec-fuji-sv1-other.fits 156 MB 34,152
fastspec-fuji-sv2-backup.fits 664 KB 107
fastspec-fuji-sv2-bright.fits 213 MB 46,510
fastspec-fuji-sv2-dark.fits 241 MB 52,781
fastspec-fuji-sv3-backup.fits 7.31 MB 1,564
fastspec-fuji-sv3-bright.fits 1.19 GB 265,325
fastspec-fuji-sv3-dark.fits 2.66 GB 592,441
fastspec-fuji.fits 6.29 GB 1,397,603

The following table summarizes the number of QSO targets whose redshift has been updated using the procedure documented :ref:`here<qso redshifts>`.

.. rst-class:: columns
Catalog Number of Objects Number with Corrected Redshifts
{fastspec}-fuji-cmx-other.fits 2,771 56
{fastspec}-fuji-special-dark.fits 35,649 313
{fastspec}-fuji-sv1-backup.fits 3,683 100
{fastspec}-fuji-sv1-bright.fits 126,678 65
{fastspec}-fuji-sv1-dark.fits 235,942 3,810
{fastspec}-fuji-sv1-other.fits 34,152 170
{fastspec}-fuji-sv2-backup.fits 107 0
{fastspec}-fuji-sv2-bright.fits 46,510 8
{fastspec}-fuji-sv2-dark.fits 52,781 1,029
{fastspec}-fuji-sv3-backup.fits 1,564 0
{fastspec}-fuji-sv3-bright.fits 265,325 133
{fastspec}-fuji-sv3-dark.fits 592,441 3,444
{fastspec}-fuji.fits 1,397,603 9,128

Code & Template Versions

The following tables document the code versions and environment variables used to produce this VAC. For details regarding the revision history of FastSpecFit, please see the change log.

Note that the tagged dependencies can be retrieve from any FITS file with the following bit of code:

import fitsio
from desiutil.depend import Dependencies
codever = Dependencies(fitsio.read_header('/path/to/fastspecfit/file.fits, ext=0))
for codename, version in codever.items():
    print(codename, version)

.. rst-class:: columns
Software Package Version(s)
python 3.10.8
numpy 1.22.4
scipy 1.8.1
astropy 5.2.1
yaml 6.0
matplotlib 3.6.2
fitsio 1.1.8
desiutil 3.4.2
desispec 0.60.2
desitarget 2.6.1
desimodel 0.19.0
speclite 0.17
fastspecfit 2.4.3 
.. rst-class:: columns
Environment Variable Value
DESI_ROOT /dvs_ro/cfs/cdirs/desi
DUST_DIR /dvs_ro/cfs/cdirs/cosmo/data/dust/v0_1
FPHOTO_DIR /dvs_ro/cfs/cdirs/desi/external/legacysurvey/dr9
FTEMPLATES_DIR /dvs_ro/cfs/cdirs/desi/science/gqp/templates/fastspecfit
FTEMPLATES_FILE ftemplates-chabrier-1.2.0.fits (see README.txt)
FPHOTO_FILE /global/common/software/desi/perlmutter/desiconda/20230111-2.1.0/code/fastspecfit/2.4.3/lib/python3.10/site-packages/fastspecfit/data/legacysurvey-dr9.yaml
EMLINES_FILE /global/common/software/desi/perlmutter/desiconda/20230111-2.1.0/code/fastspecfit/2.4.3/lib/python3.10/site-packages/fastspecfit/data/emlines.ecsv

Notes & Known Issues

In this section we briefly document issues or problems which were identified with the VAC after its final release, and provide additional details regarding previous versions of this VAC.

Please see the change log for a record of what code and data model changes have occurred since these versions were released and to report additional problems or to request new features please open a ticket.

v3.1 (latest release)

  • Release date: December 2023
  • FastSpecFit version: 2.4.3
  • Templates: ftemplates-chabrier-1.2.0.fits (see README.txt).
  • Notes:
    • Minor updates to spectrophotometric templates (expanded velocity dispersion grid; see PR/#158).
  • Known Issues:
    • Warning: Stellar masses are systematically higher (by 0.2-0.5 dex) compared to other methods, so they should be used with caution (see issue/#159). Similarly, star-formation rates and other SPS model parameters have not been fully validated.

v3.0

  • Release date: August 2023
  • FastSpecFit versions: 2.4.1, 2.4.2
  • Templates: ftemplates-chabrier-1.1.0.fits (see README.txt).
  • Notes:
    • Minor updates to spectrophotometric templates.
    • Just two rounds of emission-line fitting, not three (see PR/#151).
    • Updated IGM attenuation coefficients (see PR/#136).
    • Major algorithmic updates related to how emission-line amplitudes, fluxes, and inverse variances are computed, including a bug fix which the emission-line model spectra were not being convolved with the resolution matrix (see PR/#137).
  • Known Issues:
    • Warning: Stellar masses are systematically higher (by 0.2-0.5 dex) compared to other methods, so they should be used with caution (see issue/#159). Similarly, star-formation rates and other SPS model parameters have not been fully validated.
    • Bug: Fluxes (and EWs) of lines which lie in the camera-overlap region are overestimated by a factor of 2 due to a bug handling the different pixel scale (fixed in PR/#157).

v2.0

  • Release date: February 2023
  • FastSpecFit versions: 2.1.0, 2.1.1
  • Templates: ftemplates-chabrier-1.0.0.fits (see README.txt).
  • Notes:
    • Major update of underlying spectrophotometric templates.
  • Known Issues:
    • Bug: [OII] 7320,7330 doublet amplitude ratio incorrectly inverted (fixed in PR/#120).
    • Bug: Artificial redshift dependence in derived stellar masses due to age prior (fixed in PR/#132).
    • Bug: Emission-line subtracted Dn(4000) values incorrectly computed (fixed in PR/#135).

v1.0

  • Release date: August 2022
  • FastSpecFit versions: 1.0.0, 1.0.1
  • Templates: SSP-CKC14z/v1.0
  • Notes & Known Issues:
    • First major release; many issues addressed in future releases.