SPT-3G Data Products

SPT-3G 5-Year Main Field Catalog



A catalog of galaxy clusters selected using the thermal Sunyaev-Zel’dovich (SZ) effect from 5 years of observations of the SPT-3G Main Field. The production of the cluster catalog is described by Bleem et al. (2026). If you have any questions regarding this data set or its use, please contact Lindsey Bleem (lbleem_at_anl_dot_gov).

Cluster Catalog

Column Description
SPT ID: Cluster name in the format SPT-CL JHHMM.m-DDMM.m, except for clusters published previously with SPT designation, which are labeled as SPT-CL JHHMM-DDMM to be consistent with previous IAU naming scheme
RA: Right ascension (degrees)
DEC: Declination (degrees)
XI: SPT detection significance
THETA CORE: Filter core size corresponding to detection
YSZ: Integrated Comptonization measured within 0.75'
YSZ_UNC: 1 sigma Uncertainty on integrated Comptonization measured within 0.75'
PS FLAG: (1) if cluster within 4' of a bright source > 6 mJy at 150 GHz, (2) if ySZ measurement impacted by nearby source/massive cluster, (3) if both
REDSHIFT: Redshift
REDSHIFT UNC: Uncertainty on redshift
REDSHIFT SOURCE: Source of redshift (spectroscopic, MCMF, Spitzer, etc.)
SPECZ: Binary, 1 if redshift is spectroscopic, 0 if not
SPECZ REF: Bibliographic reference for spectroscopic redshift
M500C: Mass, units of 10^14 Msun/h70
M500C_UERR: Upper 1 sigma uncertainty on the mass estimate
M500C_LERR: Lower 1 sigma uncertainty on the mass estimate
LAMBDA: MCMF richness (where available)
LAMBDA_UNC: 1 sigma uncertainty on MCMF richness
FCONT: Contamination estimation for structure associated with redshift assignment
MCMF_MASK1: Fraction of optical data within 1' masked in MCMF analysis
MCMF_MASK2: Fraction of optical data within 2' masked in MCMF analysis
LOS: Binary flag identifying systems with multiple significant optical/IR structures along the line of sight
LAMBDA2: Richness estimation of secondary structure
LAMBDA2 UNC: Uncertainty on richness estimation of secondary structure
REDSHIFT2·: Redshift estimate for secondary structure
REDSHIFT2_UNC: Redshift uncertainty for secondary structure
FCONT2: Contamination estimate for secondary structure
STRONG_LENS: Gravitational strong lens flag, (1) Optical strong lens flagged by our visual analysis, (2) Strong lens from the literature, (3) if both.
STRONG_LENS_REF: Bibliographic reference for strong lens
DSFG_FLAG: (1) if DSFG within 30'' of SZ centroid, (2) if ySZ potentially biased by dusty signal, (3) if both

Additional Details:

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