DEEP2 DR3 Data Products

All of the DEEP2 survey data products are generated using the IDL data analysis application and stored as IDL structures. These structures are then packaged as BINARY TABLES within standard FITS files. While the data can be read using any standard FITS reader, we provide documentation for reading the DR3 data with IDL. Much useful IDL code including a plethora of FITS-related routines are contained in the Princeton IDL library within the IDLUTILS package. Instructions for downloading and installing the IDLUTILS code can be found as part of the DEEP2 DEIMOS spec2d pipeline documentation. While not documented on this site, information on how to read BINTABLES outside of IDL can be found at the NASA Goddard Space Flight Center software page.

Photometric Catalogs
The photometric catalogs spanning the entirety of all four DEEP2 survey fields were released as part of DEEP2 DR1. To download or read more about the photometric catalogs, refer to the DR1 website.

Redshift Catalog
The DEEP2 DR3 redshift catalog contains 49,023 entries corresponding to the 1-d and 2-d spectra included in this data release. Like all of the other data products in DR3, the DEEP2 redshift catalog (or "zcat") is packaged as a BINARY TABLE in a standard FITS file, but is also available as an ASCII TABLE:

        Redshift Catalog (FITS BINTABLE): zcat.dr3.v1_0.fits.gz

        Redshift Catalog (ASCII TABLE): zcat.dr3.v1_0.dat

For a discussion of the DEEP2 redshift pipeline and the format of the redshift catalog, refer to the zcat primer. Note that the redshift catalog includes all spectroscopic targets regardless of whether an accurate redshift was measured; only objects with redshift quality (ZQUALITY) greater than or equal to 3 should be treated as having a reliable redshift measurement. Also, be sure to note that while there are 50,386 entries in the redshift catalog, some objects were observed multiple times (to test redshift accuracy, etc.) and the redshift catalog contains 46,337 unique objects. In addition to the full zcat, here we provide a trimmed redshift catalog which removes duplicate objects from the full zcat (keeping entries with higher redshift quality where appropriate):

        Unique Redshift Catalog (FITS BINTABLE): zcat.dr3.v1_0.uniq.fits.gz

        Unique Redshift Catalog (ASCII TABLE): zcat.dr3.v1_0.uniq.dat

Each unique object in the DEEP2 redshift catalog is assigned a unique 8-digit object number (or OBJNO). The first digit of each OBJNO designates the DEEP2 field, to which the corresponding object belongs. For instance, all objects in the Extended Groth Strip (EGS) have object numbers of the form 1xxxxxx. Unlike the other DEEP2 fields, objects at z < 0.7 were not excluded from selection in the EGS. For more details regarding the selection of sources for DEEP2, refer to Davis et al. 2004 and Davis et al. 2007.

1-D and 2-D DEIMOS Spectra
The DEEP2 DR3 includes high-resolution DEIMOS spectra for more than 45,000 sources spanning >300 DEIMOS slitmasks. Each slitmask was observed for ~1 hour with some variation depending on seeing, weather conditions, etc. All observations utilize the 1200 lines/mm grating centered at 7800Å and the OG550 order-blocking filter with 1" slitwidths. The raw DEIMOS data were reduced using the DEEP2 DEIMOS spec2d pipeline (version v1.1.4).

The 1-d and 2-d spectra for the entire DR3 are available via the wget command. Below are commands for downloading all of the 1-d spectra in DR3, all of the 2-d spectra in DR3, and for downloading both 1-d and 2-d spectra for a given DEEP2 pointing (e.g., pointing 32).

For downloading all of the DR3 1-d spectra:
        wget --dot-style=mega --quota=0 --no-host-directories \
            --no-parent --non-verbose --recursive --retr-symlinks \
            --accept "spec1d.*.fits"

For downloading all of the DR3 2-d spectra:
        wget --dot-style=mega --quota=0 --no-host-directories \
            --no-parent --non-verbose --recursive --retr-symlinks \
            --accept "slit.*.fits.gz"

For downloading all of the DR3 1-d & 2-d spectra for pointing 32:
        wget --dot-style=mega --quota=0 --no-host-directories \
            --no-parent --non-verbose --recursive --retr-symlinks \
            --reject "2*" --reject "4*" \
            --accept "spec1d.32*.fits" --accept "slit.32*.fits.gz"

The DEEP2 spectra are stored in a directory tree with multiple subdirectories, divided according to slitmask and observation date. The 1-d spectra for DR3 total >25GB, while the 2-d spectra occupy >125GB of disk space. The 1-d and 2-d spectra for a single DEEP2/DEIMOS slitmask will consume roughly 350-450MB of space. For a more detailed discussion of the 1-d and 2-d spectra, refer to the spectral primer.

Slitmask Design Info
In addition to the 1-d and 2-d spectra, DR3 includes the DEIMOS slitmask design information for each slitmask. The "bintabs" file for a given slitmask (e.g., 3206.bintabs.fits) details the position and dimension (PA, length, width, etc.) of each slitlet, the objects placed in each slitlet, and much more. This information is housed in several binary tables:

        (1) ObjectCat
        (2) MaskDesign
        (3) DesiSlits
        (4) SlitObjMap
        (5) MaskBlu
        (6) BluSlits
        (7) Observers
        (8) PhotCat

These tables (and the slitlets and objects on the slitmask) are linked through multiple common indentifiers (e.g., OBJECTID and DESID). Brief descriptions of the different tables are given here.

We emphasize that this is an initial data release for these fields, not a final release. All spectra and redshifts will be rechecked before the completion of the DEEP2 survey. Both slitmask design and data reduction pipelines evolved somewhat during the first DEEP2 observing season. While all data on this site have been reduced with the most recent version of the spec2d pipeline, a subset of the redshifts were checked using earlier iterations of the code.

created by M. Cooper
last updated 2007aug01