Abstract
We present measurements of E-mode polarization and temperature-E-mode correlation in the cosmic microwave background using data from the first season of observations with SPTpol, the polarization-sensitive receiver currently installed on the South Pole Telescope (SPT). The observations used in this work cover 100 deg2 of sky with arcminute resolution at 150 GHz. We report the E-mode angular auto-power spectrum (EE) and the temperature-E-mode angular cross-power spectrum (TE) over the multipole range 500 < ℓ ≤ 5000. These power spectra improve on previous measurements in the high-ℓ (small-scale) regime. We fit the combination of the SPTpol power spectra, data from Planck, and previous SPT measurements with a six-parameter ΛCDM cosmological model. We find that the best-fit parameters are consistent with previous results. The improvement in high-ℓ sensitivity over previous measurements leads to a significant improvement in the limit on polarized point-source power: after masking sources brighter than 50 mJy in unpolarized flux at 150 GHz, we find a 95% confidence upper limit on unclustered point-source power in the EE spectrum of Dℓ = ℓ(ℓ + ℓ)Cℓ/2π < 0.40 μK2 at ℓ = 3000, indicating that future EE measurements will not be limited by power from unclustered point sources in the multipole range , and possibly much higher in ℓ.
| Original language | English (US) |
|---|---|
| Article number | 36 |
| Journal | Astrophysical Journal |
| Volume | 805 |
| Issue number | 1 |
| DOIs | |
| State | Published - May 20 2015 |
Bibliographical note
Publisher Copyright:© 2015. The American Astronomical Society. All rights reserved.
Keywords
- Cosmic background radiation
- Cosmology: observations
- Polarization
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