Iron fastphot VAC (DR1)
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 Iron fastspec VAC.
Please refer to the 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 previous versions.
Data Content & Access
Data from the Iron fastphot VAC can be accessed at any of the following links:
Data url |
|
NERSC (for collaborators) |
|
For more information regarding the content and organization of the VAC, please click on the following links:
Updated QSO Redshifts
The QSO redshift corrections applied to this VAC are identical to those used in the 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.
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.
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 |
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) |
Notes & Known Issues
v1.0 (latest release)
Release date: June 2026
FastSpecFitversion:3.2.0Templates:
ftemplates-chabrier-2.0.0.fits(see README.txt).Notes:
Initial public release of the
Ironfastphot VAC.
Known issues:
None at this time.