Measurements of E-Mode Polarization and Temperature-E-Mode Correlation in the Cosmic Microwave Background from 100 Square Degrees of SPTpol Data

Abstract

We present measurements of $E$-mode polarization and temperature-$E$-mode correlation in the cosmic microwave background (CMB) 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~\sqdeg\ 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 $500<\ell \le 5000$. These power spectra improve on previous measurements in the high-$\ell$ (small-scale) regime. We fit the combination of the SPTpol power spectra, data from \planck\, and previous SPT measurements with a six-parameter \LCDM cosmological model. We find that the best-fit parameters are consistent with previous results. The improvement in high-$\ell$ 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 $D_\ell = \ell (\ell+1) C_\ell / 2 π< 0.40 \ μ{\mbox{K}}^2$ at $\ell =3000$, indicating that future $EE$ measurements will not be limited by power from unclustered point sources in the multipole range $\ell <3600$, and possibly much higher in $\ell .$

References in corpus (11)

• The NumPy array: a structure for efficient numerical computation
• A measurement of secondary cosmic microwave background anisotropies from the 2500-square-degree SPT-SZ survey
• SPTpol: an instrument for CMB polarization measurements with the South Pole Telescope
• Second Season QUIET Observations: Measurements of the CMB Polarization Power Spectrum at 95 GHz
• Unbiased Estimation of an Angular Power Spectrum
• Improved Performance of TES Bolometers using Digital Feedback
• Digital Frequency Domain Multiplexer for mm-Wavelength Telescopes
• An upper limit to polarized submillimetre emission in Arp 220
• Feedhorn-coupled TES polarimeter camera modules at 150 GHz for CMB polarization measurements with SPTpol
• Performance and on-sky optical characterization of the SPTpol instrument
• South Pole Telescope Software Systems: Control, Monitoring, and Data Acquisition

Cited by in corpus (1)

• Measurements of Sub-degree B-mode Polarization in the Cosmic Microwave Background from 100 Square Degrees of SPTpol Data