Magellan/IMACS Spectroscopy of the UDS and COSMOS Fields

 

Each entry in the UDS redshift catalog is described by 12 tags. In the ASCII version of the catalog, each tag comprises a space-deliminated column. Note that there can be multiple entries in the redshift catalog for a given object. Each entry corresponds to a particular observation of that object designated by the IMACS slitmask (given by MASKNAME), the slit number on the mask (SLITNAME), and the date of observation (MJD). Below, we provide a basic description of each tag. Note that in most instances (e.g., when computing rest-frame quantities) one should use the heliocentric-corrected redshift value (ZHELIO) versus the observed value (Z).

Catalog Tag

ID

RA

DEC

MAGR

OBJNAME

MASKNAME

SLITNAME

MJD

Z

Z_ERR

ZHELIO

ZQUALITY

Data Type

LONG

DOUBLE

DOUBLE

FLOAT

STRING

STRING

STRING

FLOAT

FLOAT

FLOAT

FLOAT

INT

Brief Description

Object id within the Magellan/IMACS UDS sample

RA (J2000)

Dec (J2000)

Rc-band magnitude (AB) from Subaru imaging (Furusawa et al. 2008)

Object name (should be same as ID)

Name of IMACS slitmasks corresponding to this observation of the object

The slit number for the slitlet containing the object

Modified Julian date of observation

Observed best-fitting redshift

Redshift error

Redshift corrected for heliocentric motion

Redhshift quality code, Q