Magellan/IMACS Spectroscopy of the UDS and COSMOS Fields
Each entry in the COSMOS 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 public COSMOS intermediate and broad-band photometric catalog
RA (J2000)
Dec (J2000)
r+-band magnitude (AB) from Subaru imaging
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