DEEP2 Galaxy Redshift Survey

 

The redshift measurement for each object in the DEEP2 DR4 database is inspected by eye and assigned a quality code (Q = -2, -1, 0, 1, 2, 3, 4) based on the determined accuracy of the redshift value. The break-down of the quality codes is like so

Quality Code

Q = -2

Q = -1

Q = 0

Q = 1


Q = 2


Q = 3

Q = 4

Brief Description

Object was effectively unobserved

Object is identified as a star (i.e., z ~ 0)

Object has yet to be inspected; quality still to be assigned.

Redshift unlikely to be recovered for this source; redshift value in catalog is not meaningful.

Redshift may yet to be recovered for this source; redshift value in catalog is not meaningful.

Secure redshift

Very secure redshift.

Note that each entry in the redshift catalog corresponds to a particular observation of an object. A given object may appear more than once in the catalog. Of the 50,319 unique targets in the sample, 2596 appear on more than one DEIMOS slitmask (i.e., 52,989 total entries in the redshift catalog). For more quantitative details regarding the precision or accuracy associated with the various redshift quality codes, refer to Newman et al. (2013).

The DEEP2 Redshift Quality Codes

Data Release 4