.. _iron fastphot vac: Iron fastphot VAC (DR1) ======================= .. contents:: Contents :depth: 3 Overview -------- This page describes the ``Iron`` fastphot value-added catalog, which contains photometry-only continuum fitting results and was publicly released as part of `DESI Data Release 1 (DESI/DR1)`_. For the companion full spectrophotometric catalog, see the :ref:`Iron fastspec VAC`. 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`. Data Content & Access --------------------- Data from the ``Iron`` fastphot VAC can be accessed at any of the following links: ============================ ========================================================= Data url https://data.desi.lbl.gov/desi/vac/dr1/fastphot/iron/v1.0 `NERSC`_ (for collaborators) ``/global/cfs/cdirs/desi/vac/dr1/fastphot/iron/v1.0`` ============================ ========================================================= For more information regarding the content and organization of the VAC, please click on the following links: * :ref:`Healpix Catalogs` * :ref:`Merged Catalogs` * :ref:`Sample Selection` * :ref:`Updated QSO Redshifts` .. _`qso redshifts iron fastphot`: Updated QSO Redshifts --------------------- The QSO redshift corrections applied to this VAC are identical to those used in the :ref:`Iron fastspec VAC`; refer to that page for the algorithm description and per-catalog correction counts. Summary Statistics ------------------ The following tables summarize the size and number of targets in each merged catalog, organized by survey and program. .. rst-class:: columns ============================ ========= ================= File Name File Size Number of Targets ============================ ========= ================= fastphot-iron-cmx-other.fits 2.34 MB 2,762 ============================ ========= ================= ============================= ========= ================= File Name File Size Number of Targets ============================= ========= ================= fastphot-iron-sv1-backup.fits 2.95 MB 3,331 fastphot-iron-sv1-bright.fits 106 MB 126,650 fastphot-iron-sv1-dark.fits 196 MB 233,202 fastphot-iron-sv1-other.fits 28.6 MB 34,112 Total (sv1) 334 MB 397,295 ============================= ========= ================= ============================= ========= ================= File Name File Size Number of Targets ============================= ========= ================= fastphot-iron-sv2-backup.fits 132 KB 105 fastphot-iron-sv2-bright.fits 39.3 MB 46,486 fastphot-iron-sv2-dark.fits 44.4 MB 52,690 Total (sv2) 83.8 MB 99,281 ============================= ========= ================= ============================= ========= ================= File Name File Size Number of Targets ============================= ========= ================= fastphot-iron-sv3-backup.fits 1.33 MB 1,524 fastphot-iron-sv3-bright.fits 229 MB 265,293 fastphot-iron-sv3-dark.fits 511 MB 592,191 Total (sv3) 741 MB 859,008 ============================= ========= ================= ================================= ========= ================= File Name File Size Number of Targets ================================= ========= ================= fastphot-iron-special-backup.fits 458 KB 552 fastphot-iron-special-bright.fits 32.1 MB 43,261 fastphot-iron-special-dark.fits 11.1 MB 14,954 fastphot-iron-special-other.fits 32.9 MB 42,064 Total (special) 76.5 MB 100,831 ================================= ========= ================= ========================================== =========== ================= File Name File Size Number of Targets ========================================== =========== ================= fastphot-iron-main-backup.fits 11.2 MB 15,163 fastphot-iron-main-bright-nside1-hp00.fits 76.8 MB 101,838 fastphot-iron-main-bright-nside1-hp01.fits 766 MB 1,017,041 fastphot-iron-main-bright-nside1-hp02.fits 1.02e+03 MB 1,358,627 fastphot-iron-main-bright-nside1-hp03.fits 304 MB 403,581 fastphot-iron-main-bright-nside1-hp04.fits 740 MB 981,600 fastphot-iron-main-bright-nside1-hp05.fits 227 MB 301,057 fastphot-iron-main-bright-nside1-hp06.fits 1.02e+03 MB 1,347,464 fastphot-iron-main-bright-nside1-hp07.fits 508 MB 673,711 fastphot-iron-main-bright-nside1-hp08.fits 61.6 MB 81,734 fastphot-iron-main-bright-nside1-hp09.fits 50.4 MB 66,856 fastphot-iron-main-bright-nside1-hp10.fits 34.4 MB 45,570 fastphot-iron-main-bright-nside1-hp11.fits 50.4 MB 66,848 fastphot-iron-main-dark-nside1-hp00.fits 269 MB 352,447 fastphot-iron-main-dark-nside1-hp01.fits 853 MB 1,118,746 fastphot-iron-main-dark-nside1-hp02.fits 1.26 GB 1,699,122 fastphot-iron-main-dark-nside1-hp03.fits 164 MB 214,658 fastphot-iron-main-dark-nside1-hp04.fits 1.29 GB 1,739,317 fastphot-iron-main-dark-nside1-hp05.fits 441 MB 579,026 fastphot-iron-main-dark-nside1-hp06.fits 2.12 GB 2,851,879 fastphot-iron-main-dark-nside1-hp07.fits 787 MB 1,032,151 fastphot-iron-main-dark-nside1-hp08.fits 165 MB 216,757 fastphot-iron-main-dark-nside1-hp09.fits 119 MB 156,454 fastphot-iron-main-dark-nside1-hp10.fits 56.8 MB 74,463 fastphot-iron-main-dark-nside1-hp11.fits 31 MB 40,609 Total (main) 12.3 GB 16,536,719 ========================================== =========== ================= 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`_. .. rst-class:: columns ================ ========== Software Package Version(s) ================ ========== python 3.10.14 numpy 1.22.4 scipy 1.8.1 astropy 6.0.1 yaml 6.0.1 matplotlib 3.8.4 fitsio 1.2.1 mpi4py 3.1.6 healpy 1.16.6 desiutil 3.4.3 desispec 0.68.1 desitarget 2.8.0 speclite 0.20 fastspecfit 3.2.0 ================ ========== .. rst-class:: columns ==================== ============================================================ Environment Variable Value ==================== ============================================================ DESI_ROOT /global/cfs/cdirs/desi DUST_DIR /dvs_ro/cfs/cdirs/desi/external/dust/v0_1 FPHOTO_DIR /dvs_ro/cfs/cdirs/desi/external/legacysurvey/dr9 FTEMPLATES_DIR /dvs_ro/cfs/cdirs/desi/public/external/templates/fastspecfit FTEMPLATES_FILE ftemplates-chabrier-2.0.0.fits (see `README.txt`_) ==================== ============================================================ .. _previous versions - iron fastphot: Notes & Known Issues -------------------- v1.0 (latest release) ~~~~~~~~~~~~~~~~~~~~~~ * Release date: June 2026 * ``FastSpecFit`` version: ``3.2.0`` * Templates: ``ftemplates-chabrier-2.0.0.fits`` (see `README.txt`_). * Notes: * Initial public release of the ``Iron`` fastphot VAC. * Known issues: * None at this time. .. _`DESI Data Release 1 (DESI/DR1)`: https://data.desi.lbl.gov/doc/releases/dr1 .. _`NERSC`: https://nersc.gov .. _`open a ticket`: https://github.com/desihub/fastspecfit/issues .. _`change log`: https://github.com/desihub/fastspecfit/blob/main/doc/changes.rst .. _`README.txt`: https://data.desi.lbl.gov/public/external/templates/fastspecfit/README.txt