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South Pole Telescope (SPT)

2020 Point Source Catalog

This page provides data products associated with the point-source catalog from 2530 square degrees of SPT data described in Everett et al. (2020). Linked below are the full three-band source catalog (down to a significance threshold of 4.5 sigma), the differential number counts in each band---total and divided into synchrotron- and dust-dominated counts---and the cumulative number counts in each band.

"Point-source-filtered, CLEAN'ed maps and associated products"


Catalog

Column descriptions from Everett et al. 2020:

1. Source ID: the IAU designation for the SPT-detected source.
2. RA: right ascension (J2000) in degrees.
3. DEC: declination (J2000) in degrees.
4. S/N (95 GHz): detection significance (signal-to-noise ratio) in the 95 GHz band.
5. Sraw (95 GHz): raw flux (uncorrected for flux boosting) in the 95 GHz band.
6. Sbest (95 GHz): median value of de-boosted flux at 95 GHz.
7. dSup (95 GHz): upper error bar (1-sigma normal equivalent) of de-boosted flux at 95 GHz.
8. dSdown (95 GHz): lower error bar (1-sigma normal equivalent) of de-boosted flux at 95 GHz.
9. S/N (150 GHz): detection significance (signal-to-noise ratio) in the 150 GHz band.
10. Sraw (150 GHz): raw flux (uncorrected for flux boosting) in the 150 GHz band.
11. Sbest (150 GHz): median value of de-boosted flux at 150 GHz.
12. dSup (150 GHz): upper error bar (1-sigma normal equivalent) of de-boosted flux at 150 GHz.
13. dSdown (150 GHz): lower error bar (1-sigma normal equivalent) of de-boosted flux at 150 GHz.
14. S/N (220 GHz): detection significance (signal-to-noise ratio) in the 150 GHz band.
15. Sraw (220 GHz): raw flux (uncorrected for flux boosting) in the 220 GHz band.
16. Sbest (220 GHz): median value of de-boosted flux at 220 GHz.
17. dSup (220 GHz): upper error bar (1-sigma normal equivalent) of de-boosted flux at 220 GHz.
18. dSdown (220 GHz): lower error bar (1-sigma normal equivalent) of de-boosted flux at 220 GHz
19. alpha95-150raw: estimate (from the raw flux in each band) of the 95 GHz-150 GHz spectral index alpha
20. alpha95-150best: median value of spectral index.
21. d_alpha95-150up: upper error bar (1-sigma normal equivalent) of spectral index.
22. d_alpha95-150down: lower error bar (1-sigma normal equivalent) of spectral index.
23. alpha150-220raw: estimate (from the raw flux in each band) of the 150 GHz-220 GHz spectral index alpha
24. alpha150-220best: median value of spectral index.
25. d_alpha150-220up: upper error bar (1-sigma normal equivalent) of spectral index 27. P(alpha > 1.51): fraction of the spectral index posterior probability distribution above the threshold value of 1.51. A higher value of P means the source is more likely to be dust-dominated.
28. Type: source classification ((sync)hrotron- or (dust)-dominated).
29. External counterparts: (1): SUMSS, (2): IRAS, (3): AT20G, (4): WISE, (5): PMN, (6): AKARI/FIS, (7): AKARI/IRC, (8): RASS
30. Extended flag: flag for extended sources.
31. Redshift: cross-matched redshift from NED, if available.
32. Cut selection: (1): Ext cut, (2): z cut, (3): SMG list, (4): stars

If you have any questions regarding this data set or its use please contact Wendy Everett (wendeline.everett_at_colorado.edu).


Differential Source Counts at 95 GHz

1. Flux range [low]: Low end of flux bin in which counts were estimated. In units of Jy.
2. Flux range [high]: High end of flux bin in which counts were estimated. In units of Jy.
3. dN/dS total no cuts, central: Central value of differential counts (in units of number per square degree per Jy) for all sources detected at 95 GHz.
4. dN/dS total no cuts, lower error bar: 1-sigma lower error bar for differential counts (in units of number per square degree per Jy) for all sources detected at 95 GHz.
5. dN/dS total no cuts, upper error bar: 1-sigma upper error bar for differential counts (in units of number per square degree per Jy) for all sources detected at 95 GHz.
6. dN/dS synchrotron z cut, central: Same as [3] for synchrotron-dominated sources detected at 95 GHz.
7. dN/dS synchrotron z cut, lower error bar: Same as [4] for synchrotron-dominated sources detected at 95 GHz.
8. dN/dS synchrotron z cut, upper error bar: Same as [5] for synchrotron-dominated sources detected at 95 GHz.
9. dN/dS dust z cut, central: Same as [3] for dust-dominated sources detected at 95 GHz.
10. dN/dS dust z cut, lower error bar: Same as [4] for dust-dominated sources detected at 95 GHz.
11. dN/dS dust z cut, upper error bar: Same as [5] for dust-dominated sources detected at 95 GHz.
12. Completeness: Average value of completeness across the flux range given by [1] and [2].

If you have any questions regarding this data set or its use please contact Wendy Everett (wendeline.everett_at_colorado.edu).


Differential Source Counts at 150 GHz

1. Flux range [low]: Low end of flux bin in which counts were estimated. In units of Jy.
2. Flux range [high]: High end of flux bin in which counts were estimated. In units of Jy.
3. dN/dS total no cuts, central: Central value of differential counts (in units of number per square degree per Jy) for all sources detected at 150 GHz.
4. dN/dS total no cuts, lower error bar: 1-sigma lower error bar for differential counts (in units of number per square degree per Jy) for all sources detected at 150 GHz.
5. dN/dS total no cuts, upper error bar: 1-sigma upper error bar for differential counts (in units of number per square degree per Jy) for all sources detected at 150 GHz.
6. dN/dS synchrotron z cut, central: Same as [3] for synchrotron-dominated sources detected at 150 GHz.
7. dN/dS synchrotron z cut, lower error bar: Same as [4] for synchrotron-dominated sources detected at 150 GHz.
8. dN/dS synchrotron z cut, upper error bar: Same as [5] for synchrotron-dominated sources detected at 150 GHz.
9. dN/dS dust z cut, central: Same as [3] for dust-dominated sources detected at 150 GHz.
10. dN/dS dust z cut, lower error bar: Same as [4] for dust-dominated sources detected at 150 GHz.
11. dN/dS dust z cut, upper error bar: Same as [5] for dust-dominated sources detected at 150 GHz.
12. dN/dS SMG, central: Same as [3] for SMG list sources detected at 150 GHz.
13. dN/dS SMG, lower error bar: Same as [4] for SMG list sources detected at 150 GHz.
14. dN/dS SMG, upper error bar: Same as [5] for SMG list sources detected at 150 GHz.
15. Completeness: Average value of completeness across the flux range given by [1] and [2].

If you have any questions regarding this data set or its use please contact Wendy Everett (wendeline.everett_at_colorado.edu).


Differential Source Counts at 220 GHz

1. Flux range [low]: Low end of flux bin in which counts were estimated. In units of Jy.
2. Flux range [high]: High end of flux bin in which counts were estimated. In units of Jy.
3. dN/dS total no cuts, central: Central value of differential counts (in units of number per square degree per Jy) for all sources detected at 220 GHz.
4. dN/dS total no cuts, lower error bar: 1-sigma lower error bar for differential counts (in units of number per square degree per Jy) for all sources detected at 220 GHz.
5. dN/dS total no cuts, upper error bar: 1-sigma upper error bar for differential counts (in units of number per square degree per Jy) for all sources detected at 220 GHz.
6. dN/dS synchrotron z cut, central: Same as [3] for synchrotron-dominated sources detected at 220 GHz.
7. dN/dS synchrotron z cut, lower error bar: Same as [4] for synchrotron-dominated sources detected at 220 GHz.
8. dN/dS synchrotron z cut, upper error bar: Same as [5] for synchrotron-dominated sources detected at 220 GHz.
9. dN/dS dust z cut, central: Same as [3] for dust-dominated sources detected at 220 GHz.
10. dN/dS dust z cut, lower error bar: Same as [4] for dust-dominated sources detected at 220 GHz.
11. dN/dS dust z cut, upper error bar: Same as [5] for dust-dominated sources detected at 220 GHz.
12. dN/dS SMG, central: Same as [3] for SMG list sources detected at 220 GHz.
13. dN/dS SMG, lower error bar: Same as [4] for SMG list sources detected at 220 GHz.
14. dN/dS SMG, upper error bar: Same as [5] for SMG list sources detected at 220 GHz.
15. Completeness: Average value of completeness across the flux range given by [1] and [2].

If you have any questions regarding this data set or its use please contact Wendy Everett (wendeline.everett_at_colorado.edu).


Cumulative Source Counts at 95 GHz

1. Flux range [low]: Low end of flux bin in which counts were estimated. In units of Jy.
2. Flux range [high]: High end of flux bin in which counts were estimated. In units of Jy.
3. N(>S) total no cuts, central: Central value of cumulative counts (in units of number per square degree) for all sources detected at 95 GHz.
4. N(>S) total no cuts, lower error bar: 1-sigma lower error bar for cumulative counts (in units of number per square degree) for all sources detected at 95 GHz.
5. N(>S) total no cuts, upper error bar: 1-sigma upper error bar for cumulative counts (in units of number per square degree) for all sources detected at 95 GHz.
6. N(>S) synchrotron z cut, central: Same as [3] for synchrotron-dominated sources detected at 95 GHz.
7. N(>S) synchrotron z cut, lower error bar: Same as [4] for synchrotron-dominated sources detected at 95 GHz.
8. N(>S) synchrotron z cut, upper error bar: Same as [5] for synchrotron-dominated sources detected at 95 GHz.
9. N(>S) dust z cut, central: Same as [3] for dust-dominated sources detected at 95 GHz.
10. N(>S) dust z cut, lower error bar: Same as [4] for dust-dominated sources detected at 95 GHz.
11. N(>S) dust z cut, upper error bar: Same as [5] for dust-dominated sources detected at 95 GHz.

If you have any questions regarding this data set or its use please contact Wendy Everett (wendeline.everett_at_colorado.edu).


Cumulative Source Counts at 150 GHz

1. Flux range [low]: Low end of flux bin in which counts were estimated. In units of Jy.
2. Flux range [high]: High end of flux bin in which counts were estimated. In units of Jy.
3. N(>S) total no cuts, central: Central value of cumulative counts (in units of number per square degree) for all sources detected at 150 GHz.
4. N(>S) total no cuts, lower error bar: 1-sigma lower error bar for cumulative counts (in units of number per square degree) for all sources detected at 150 GHz.
5. N(>S) total no cuts, upper error bar: 1-sigma upper error bar for cumulative counts (in units of number per square degree) for all sources detected at 150 GHz.
6. N(>S) synchrotron z cut, central: Same as [3] for synchrotron-dominated sources detected at 150 GHz.
7. N(>S) synchrotron z cut, lower error bar: Same as [4] for synchrotron-dominated sources detected at 150 GHz.
8. N(>S) synchrotron z cut, upper error bar: Same as [5] for synchrotron-dominated sources detected at 150 GHz.
9. N(>S) dust z cut, central: Same as [3] for dust-dominated sources detected at 150 GHz.
10. N(>S) dust z cut, lower error bar: Same as [4] for dust-dominated sources detected at 150 GHz.
11. N(>S) dust z cut, upper error bar: Same as [5] for dust-dominated sources detected at 150 GHz.
12. N(>S) SMG, central: Same as [3] for SMG list sources detected at 150 GHz.
13. N(>S) SMG, lower error bar: Same as [4] for SMG list sources detected at 150 GHz., excluding IRAS-FSC counterparts.

If you have any questions regarding this data set or its use please contact Wendy Everett (wendeline.everett_at_colorado.edu).


Cumulative Source Counts at 220 GHz

1. Flux range [low]: Low end of flux bin in which counts were estimated. In units of Jy.
2. Flux range [high]: High end of flux bin in which counts were estimated. In units of Jy.
3. N(>S) total no cuts, central: Central value of cumulative counts (in units of number per square degree) for all sources detected at 220 GHz.
4. N(>S) total no cuts, lower error bar: 1-sigma lower error bar for cumulative counts (in units of number per square degree) for all sources detected at 220 GHz.
5. N(>S) total no cuts, upper error bar: 1-sigma upper error bar for cumulative counts (in units of number per square degree) for all sources detected at 220 GHz.
6. N(>S) synchrotron z cut, central: Same as [3] for synchrotron-dominated sources detected at 220 GHz.
7. N(>S) synchrotron z cut, lower error bar: Same as [4] for synchrotron-dominated sources detected at 220 GHz.
8. N(>S) synchrotron z cut, upper error bar: Same as [5] for synchrotron-dominated sources detected at 220 GHz.
9. N(>S) dust z cut, central: Same as [3] for dust-dominated sources detected at 220 GHz.
10. N(>S) dust z cut, lower error bar: Same as [4] for dust-dominated sources detected at 220 GHz.
11. N(>S) dust z cut, upper error bar: Same as [5] for dust-dominated sources detected at 220 GHz.
12. N(>S) SMG, lower error bar: Same as [4] for SMG list sources detected at 220 GHz.
13. N(>S) SMG, upper error bar: Same as [5] for SMG list sources detected at 220 GHz.

If you have any questions regarding this data set or its use please contact Wendy Everett (wendeline.everett_at_colorado.edu).


Covariance Matrices for Number Counts

We provide covariance matrices for synchrotron-dominated number counts and SMG number counts from Everett et al. (2020). Files are available at LAMBDA

E20_SPT-SZ_PS_95GHz_sync_cov.dat
E20_SPT-SZ_PS_150GHz_sync_cov.dat
E20_SPT-SZ_PS_220GHz_sync_cov.dat
E20_SPT-SZ_PS_150GHz_dust_cov.dat
E20_SPT-SZ_PS_220GHz_dust_cov.dat

Point-source-filtered, CLEAN'ed maps and associated products

The point-source-filtered, CLEAN'ed (to 4.5 sigma) maps from Everett et al. (2020) are available on the download data page. There is one map per band (90, 150, 220 GHz) and per field in the SPT-SZ 2500-square-degree survey. These per-field maps are in the Lambert azimuthal equal-area (ZEA) projection with 0.25-arcmin pixels. They are stored in the primary array of a FITS file, with a header that includes world coordinate system (WCS) information. Also linked below is one file per band in the full-sky Healpix pixelization with nside=8192, in Galactic coordinates. The data in these files has been reprojected from the individual-field maps. To save disk space, all files have been gzipped.

The signal from all sources detected at 4.5 sigma or greater in these maps (including negative "sources" such as SZ decrements from clusters---although note that these detections are not included in the source catalog linked here, for information on detected clusters see the SPT-SZ 2500d cluster catalog papers Bleem et al. 2015 and Bocquet et al. 2019) has been removed using the CLEAN algorithm. These maps are intended to be used in conjunction with the 4.5-sigma detected source catalog, linked above. To determine the flux density at a given sky location, first check if a source at that location is included in the catalog; if not, the best-fit source flux density at that location can be read off the CLEAN'ed maps.

These maps are not meant to have aperture photometry performed on them, as they are high-passed strongly (particularly in the scan direction), and the total flux density within an aperture will tend to zero as the aperture size is increased. The typical profile of a point source in the map (the "dirty beam") in each band is stored in the "kernel" fits files linked below. The orientation of the (anisotropic) profile varies across the field; the profile provided is for the center of the map. The horizontal filtering wing follows lines of constant declination in the map, except in the ra21hdec-50 field, where the true profile is roughly 1/3 times this profile plus 2/3 times this profile 90 degrees rotated (with the filtering wing following lines of constant R.A.).


Additional Details:

  • The information on this page is taken from this SPT page.

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Goddard Space Flight Center, National Aeronautics and Space Administration
HEASARC Director: Dr. Alan P. Smale
LAMBDA Director: Dr. Thomas M. Essinger-Hileman
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Web Curator: Mr. Michael R. Greason