.. _guadalupe vac: Guadalupe VAC (DR1 Supplement) ============================== .. contents:: Contents :depth: 3 Overview -------- This page describes the ``Guadalupe`` value-added catalog, which will be publicly released as part of the `DESI Data Release 1 (DESI/DR1)`_ sometime in 2024 (exact date TBD). 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 ``Guadalupe`` VAC can be accessed at any of the following links: ============================ ======================================================================== Data url https://data.desi.lbl.gov/public/dr1/vac/dr1/fastspecfit/guadalupe/v3.1 `NERSC`_ (for collaborators) ``/global/cfs/cdirs/desi/public/dr1/vac/dr1/fastspecfit/guadalupe/v3.1`` ============================ ======================================================================== 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` 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-guadalupe-special-dark.fits 15.1 MB 3,848 fastspec-guadalupe-special-bright.fits 37.5 MB 9,598 fastspec-guadalupe-main-bright.fits 4.15 GB 1,092,041 fastspec-guadalupe-main-dark.fits 4.3 GB 1,131,858 fastspec-guadalupe.fits 8.52 GB 2,237,345 ====================================== ========= ================= The following table summarizes the number of QSO targets whose redshift has been updated using the procedure documented :ref:`here`. .. rst-class:: columns ====================================== ================= =============================== Catalog Number of Objects Number with Corrected Redshifts ====================================== ================= =============================== fastspec-guadalupe-main-bright.fits 1,092,041 156 fastspec-guadalupe-main-dark.fits 1,131,858 22,445 fastspec-guadalupe-special-bright.fits 9,598 0 fastspec-guadalupe-special-dark.fits 3,848 111 fastspec-guadalupe.fits 2,237,345 22,712 ====================================== ================= =============================== 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 2.7.0 desimodel 0.19.0 speclite 0.17 fastspecfit 2.5.0 ================ ========== .. 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-1.3.0.fits (see `README.txt`_) FPHOTO_FILE /global/common/software/desi/perlmutter/desiconda/20230111-2.1.0/code/fastspecfit/2.5.0/lib/python3.10/site-packages/fastspecfit/data/legacysurvey-dr9.yaml EMLINES_FILE /global/common/software/desi/perlmutter/desiconda/20230111-2.1.0/code/fastspecfit/2.5.0/lib/python3.10/site-packages/fastspecfit/data/emlines.ecsv ==================== ===== .. _previous versions - guadalupe: 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: January 2024 * ``FastSpecFit`` version: ``2.5.0`` * Templates: ``ftemplates-chabrier-1.3.0.fits`` (see `README.txt`_). * Notes: * Several updates to the spectrophotometric templates aimed at addressing the stellar mass bias identified in `issue/#159`_ (see `PR/#166`_): * Templates are now just solar metallicity (previously 0.1, 1, and 1.6 times solar). * Five age bins now (vs 8 previously). * Expanded velocity dispersion grid (new measurable maximum value is now 475 km/s). * Correction to how the light-weighted ages, dust attenuations, and SFRs were being computed. * When fitting the broad+narrow emission-line model, [OIII] 4959,5007 is now fitted separately and the narrow Balmer+helium+forbidden line-widths and velocity shifts are all tied together. * All known bugs fixed. * Known issues: * None at this time. 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. .. _`DESI Data Release 1 (DESI/DR1)`: https://data.desi.lbl.gov/public/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 .. _`SSP-CKC14z/v1.0`: https://data.desi.lbl.gov/public/external/templates/SSP-CKC14z/README.txt .. _`issue/#159`: https://github.com/desihub/fastspecfit/issues/159 .. _`PR/#120`: https://github.com/desihub/fastspecfit/pull/120 .. _`PR/#132`: https://github.com/desihub/fastspecfit/pull/132 .. _`PR/#135`: https://github.com/desihub/fastspecfit/pull/135 .. _`PR/#136`: https://github.com/desihub/fastspecfit/pull/136 .. _`PR/#137`: https://github.com/desihub/fastspecfit/pull/137 .. _`PR/#151`: https://github.com/desihub/fastspecfit/pull/151 .. _`PR/#157`: https://github.com/desihub/fastspecfit/pull/157 .. _`PR/#158`: https://github.com/desihub/fastspecfit/pull/158 .. _`PR/#166`: https://github.com/desihub/fastspecfit/pull/166