Abstract
We compare cosmic microwave background lensing convergence maps derived from South Pole Telescope (SPT) data with galaxy survey data from the Blanco Cosmology Survey, WISE, and a new large Spitzer/IRAC field designed to overlap with the SPT survey. Using optical and infrared catalogs covering between 17 and 68deg2 of sky, we detect a correlation between the SPT convergence maps and each of the galaxy density maps at >4σ, with zero correlation robustly ruled out in all cases. The amplitude and shape of the cross-power spectra are in good agreement with theoretical expectations and the measured galaxy bias is consistent with previous work. The detections reported here utilize a small fraction of the full 2500deg2 SPT survey data and serve as both a proof of principle of the technique and an illustration of the potential of this emerging cosmological probe.
Original language | English (US) |
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Article number | L9 |
Journal | Astrophysical Journal Letters |
Volume | 753 |
Issue number | 1 |
DOIs | |
State | Published - Jul 1 2012 |
Externally published | Yes |
Keywords
- cosmic background radiation
- galaxies: structure
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science