This page provides the SPT-Deep cluster catalog associated with the SZ-selected cluster catalog in Korenoelje et al. The SPT-Deep Cluster Catalog: Sunyaev-Zeldovich Selected Clusters from Combined SPT-3G and SPTpol Measurements over 100 Square Degrees.

If you have any questions regarding this data set or its use, please contact Kayla Kornoelje (knk_at_uchicago_dot_edu)

The SPT-Deep cluster catalog is available to download here.

The SPT-Deep cluster catalog contains the following information for each cluster candidate:

(1) SPT ID: The SPT Cluster Candidate Name

(2) RA: Right Ascension returned by tSZ cluster finder [degrees (J2000)]

(3) DEC: Declination returned by tSZ cluster finder [degrees (J2000)]

(4) XI_ILC / XI_cILC: Detection significance (XI) in the minimum-variance cluster catalog (ILC) or dust-nulled catalog (cILC), if applicable

(5) THETA_CORE_ILC / THETA_CORE_cILC: Matched Filter Scale corresponding to XI_ILC or XI_cILC, if applicable [arcminutes]

(6) REDSHIFT: Redshift of optical/IR galaxy over density counterpart

(7) REDSHIFT_SOURCE: Source of cluster candidate redshift estimate

(8) REDSHIFT_UNC: Redshift uncertainty

(9) SPECZ: Flagged 1 if spectroscopic redshift

(10) M500: Halo mass defined where the mean density is 500 times the critical density of the universe [$10^{14} M_{\odot}/h$]

(11) M500_UERR: 1 sigma upper uncertainty on mass [$10^{14} M_{\odot}/h$]

(12) M500_LERR: 1 sigma lower uncertainty on mass [$10^{14} M_{\odot}/h$]

(13) LAMBDA: Richness of optical/IR galaxy over-density

(14) CONTAMINATION: Integrated optical/IR contamination > LAMBDA

(15) CONFIRMED: Flagged 1 if contamination is < contamination confirmation threshold

(16) LOS: If there is a secondary structure along the line of sight (LOS) with F_CONT<0.2

(17) LOS_Z: Redshift secondary structure

(18) LOS_LAMBDA: Richness secondary structure

(19) LOS_FCONT: Integrated optical/IR contamination > LAMBDA_LOS

(20) COMMENT: Additional information about the cluster candidate (if applicable)

The SPT-Deep catalog on an M_500c — z plot compared to other SZ-selected cluster samples (ACT, Planck, SPT-SZ / SPTpol). We note there are 28 clusters (~6% of the sample) with redshift z > 1.6 that can only be reliably confirmed to be at least z = 1.6, as the [I1] — [I2] Spitzer color-color relation used to obtain IR redshifts flattens out above this redshift threshold. The redshifts shown for z > 1.6 clusters are drawn from an N(z) halo-mass function probability distribution assuming a fixed cosmology. The upper dash-dotted line shows the mass evolution of a 3 × 10¹⁵ M_☉ cluster at z = 0 as a function of redshift for a fixed cosmology (Fakhouri et al. 2010, ADS), while the lower dotted line represents the same mass evolution for a 1.3 × 10¹⁵ M_☉ cluster.

Median-weighted stacked cutouts of 422 confirmed clusters candidates (outlined in Section 5.2.4) with z > 0.25 in the SPT-Deep cluster catalog at 95, 150, 220, 600, 857, and 1200 GHz from the SPT-3G and Herschel/SPIRE maps. We note a visual trends: the amplitude of the dust contamination increases with redshift, visible even in the tSZ null 220 GHz band. The amplitude of these stacks is normalized to the peak absolute value in the 95 GHz stack.

The results of the joint tSZ-dust fit on a subsample of 422 confirmed cluster candidates from the SPT-Deep catalog. We show the results in three redshift bins: [0.25 < z < 0.5], [0.5 < z <1], and [z > 1], with 87, 233, and 102 clusters in each bin respectively. Plotted in the top panel is the mean signal at cluster locations in the three redshift bins at the 6 SPT and SPIRE frequencies with their bootstrapped error bars. The joint fit (blue) is shown alongside its dust contribution (red) and tSZ contribution (yellow). Both the x- and y- axes are log-linear for visualization purposes. In the bottom panel, we show the fractional dust contribution to the total measured flux as a function of frequency. Above the tSZ null at 220 GHz, where dust emission dominates the flux measurement, we observe a decline consistent with the expected contribution from the positive tSZ signal. Colored bars indicate the SPT and SPIRE central frequencies. For visualization purposes, the vertical and horizontal dashed lines in the upper and lower plots represent a transition between linear and log scaling.