Loa fastphot VAC (DR2)

Warning

This VAC has not yet been publicly released. It is currently accessible only to DESI collaboration members via NERSC.

Overview

This page describes the Loa fastphot value-added catalog, which contains photometry-only continuum fitting results and will be publicly released as part of DESI Data Release 2 (DESI/DR2). For the companion full spectrophotometric catalog, see the Loa 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 Loa fastphot VAC can be accessed at any of the following links:

Data url

https://data.desi.lbl.gov/desi/vac/dr2/fastphot/loa/v1.0

NERSC (for collaborators)

/global/cfs/cdirs/desi/vac/dr2/fastphot/loa/v1.0

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 Loa 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-loa-cmx-other.fits

2.34 MB

2,765

File Name

File Size

Number of Targets

fastphot-loa-sv1-backup.fits

1.04 MB

1,145

fastphot-loa-sv1-bright.fits

106 MB

126,658

fastphot-loa-sv1-dark.fits

198 MB

235,821

fastphot-loa-sv1-other.fits

28.5 MB

34,004

Total (sv1)

334 MB

397,628

File Name

File Size

Number of Targets

fastphot-loa-sv2-backup.fits

132 KB

107

fastphot-loa-sv2-bright.fits

39.3 MB

46,491

fastphot-loa-sv2-dark.fits

44.4 MB

52,693

Total (sv2)

83.8 MB

99,291

File Name

File Size

Number of Targets

fastphot-loa-sv3-backup.fits

1.37 MB

1,573

fastphot-loa-sv3-bright.fits

229 MB

265,307

fastphot-loa-sv3-dark.fits

511 MB

592,128

Total (sv3)

741 MB

859,008

File Name

File Size

Number of Targets

fastphot-loa-special-backup.fits

430 KB

512

fastphot-loa-special-bright.fits

87.7 MB

105,172

fastphot-loa-special-dark.fits

283 MB

261,706

Total (special)

371 MB

367,390

File Name

File Size

Number of Targets

fastphot-loa-main-backup.fits

44.5 MB

60,372

fastphot-loa-main-bright-nside1-hp00.fits

247 MB

325,494

fastphot-loa-main-bright-nside1-hp01.fits

2 GB

2,693,426

fastphot-loa-main-bright-nside1-hp02.fits

2.33 GB

3,141,532

fastphot-loa-main-bright-nside1-hp03.fits

487 MB

641,198

fastphot-loa-main-bright-nside1-hp04.fits

1.69 GB

2,285,745

fastphot-loa-main-bright-nside1-hp05.fits

310 MB

408,754

fastphot-loa-main-bright-nside1-hp06.fits

1.75 GB

2,359,953

fastphot-loa-main-bright-nside1-hp07.fits

569 MB

749,725

fastphot-loa-main-bright-nside1-hp08.fits

234 MB

307,648

fastphot-loa-main-bright-nside1-hp09.fits

52.9 MB

69,672

fastphot-loa-main-bright-nside1-hp10.fits

45.9 MB

60,466

fastphot-loa-main-bright-nside1-hp11.fits

108 MB

141,886

fastphot-loa-main-dark-nside1-hp00.fits

645 MB

846,678

fastphot-loa-main-dark-nside1-hp01.fits

2.93 GB

3,937,260

fastphot-loa-main-dark-nside1-hp02.fits

2.78 GB

3,730,928

fastphot-loa-main-dark-nside1-hp03.fits

441 MB

578,709

fastphot-loa-main-dark-nside1-hp04.fits

3.8 GB

5,112,856

fastphot-loa-main-dark-nside1-hp05.fits

659 MB

864,168

fastphot-loa-main-dark-nside1-hp06.fits

4.04 GB

5,426,022

fastphot-loa-main-dark-nside1-hp07.fits

1.2 GB

1,616,210

fastphot-loa-main-dark-nside1-hp08.fits

591 MB

775,136

fastphot-loa-main-dark-nside1-hp09.fits

119 MB

156,454

fastphot-loa-main-dark-nside1-hp10.fits

107 MB

140,162

fastphot-loa-main-dark-nside1-hp11.fits

67.6 MB

88,647

Total (main)

27.1 GB

36,519,101

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: 2027 (Exact date TBD)

  • FastSpecFit version: 3.2.0

  • Templates: ftemplates-chabrier-2.0.0.fits (see README.txt).

  • Notes:

    • Initial release of the Loa fastphot VAC.

  • Known issues:

    • None at this time.