HIGH-RESOLUTION CMB POWER SPECTRUM FROM THE COMPLETE ACBAR DATA SET

By C. Reichardt, P. Ade, J. Bock, J. Richard Bond, J. A. Brevik, C. Contaldi, M. Daub, J. T. Dempsey, J. Goldstein, W. Holzapfel and 8 more. 2008

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In this paper, we present results from the complete set of cosmic microwave background (CMB) radiation temperature anisotropy observations made with the Arcminute Cosmology Bolometer Array Receiver (ACBAR) operating at 150 GHz. We include new data from the final 2005 observing season, expanding the number of detector hours by 210% and the sky coverage by 490% over that used for the previous ACBAR release. As a result, the band-power uncertainties have been reduced by more than a factor of two on angular scales encompassing the third to fifth acoustic peaks as well as the damping tail of the CMB power spectrum. The calibration uncertainty has been reduced from 6% to 2.1% in temperature through a direct comparison of the CMB anisotropy measured by ACBAR with that of the dipole-calibrated WMAP5 experiment. The measured power spectrum is consistent with a spatially flat, ΛCDM cosmological model. We include the effects of weak lensing in the power spectrum model computations and find that this significantly improves the fits of the models to the combined ACBAR+WMAP5 power spectrum. The preferred strength of the lensing is consistent with theoretical expectations. On fine angular scales, there is weak evidence (1.1σ) for excess power above the level expected from primary anisotropies. We expect any excess power to be dominated by the combination of emission from dusty protogalaxies and the Sunyaev–Zel'dovich effect (SZE). However, the excess observed by ACBAR is significantly smaller than the excess power at ℓ>2000 reported by the CBI experiment operating at 30 GHz. Therefore, while it is unlikely that the CBI excess has a primordial origin; the combined ACBAR and CBI results are consistent with the source of the CBI excess being either the SZE or radio source contamination.

Subfields: Astronomy and Astrophysics

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What determines satellite galaxy disruption (2009, result): “For our ΛCDM cosmology (Ωm = 0.25, ΩΛ = 0.75, h = 0.72, n = 0.97 and σ8 = 0.8), in agreement with a wide array of observations (Smoot et al. 1992; Tegmark et al. 2006; Reichardt et al. 2009; Dunkley et al. c© 2009 RAS, MNRAS 000, 1–19 2009), this results in particle masses of 1.64 × 108 h−1M⊙ and a ”
SIMULATIONS OF THE SUNYAEV–ZEL'DOVICH POWER SPECTRUM WITH ACTIVE GALACTIC NUCLEUS FEEDBACK (2010, methodology): “…signals and extragalactic source models, the SZ power spectrum has been used as a template with variable amplitudeASZ for extracting cosmological parameters by the Cosmic Background Imager (CBI) team (B0205; Sievers et al. 2009) and the ACBAR team (Goldstein et al. 2003; Reichardt et al. 2009).”
The Atacama Cosmology Telescope: cosmological parameters from three seasons of data (2013, neutral): “…the CMB on smaller angular scales continues to be probed with ever-increasing precision (e.g., Hedman et al. 2002; Kuo et al. 2007; Pryke et al. 2009; Reichardt et al. 2009; Sievers et al. 2009; QUIET Collaboration et al. 2011; Reichardt et al. 2012; Das et al. 2011b; Keisler et al. 2011; QUIET…”
A MEASUREMENT OF THE DAMPING TAIL OF THE COSMIC MICROWAVE BACKGROUND POWER SPECTRUM WITH THE SOUTH POLE TELESCOPE (2011, methodology): “This “damping tail” of the primary CMB anisotropy has been measured by a number of experiments, notably the Arcminute Cosmology Bolometer Array Receiver (ACBAR, Reichardt et al. 2009), QUEST at DASI (QUaD, Brown et al. 2009; Friedman et al. 2009), and ACT (Das et al. 2011a).”
The Atacama Cosmology Telescope: temperature and gravitational lensing power spectrum measurements from three seasons of data (2013, background): “…by a number of experiments, notably the Cosmic Background Imager (CBI; Sievers et al. 2009), Arcminute Cosmology Bolometer Array Receiver (ACBAR; Reichardt et al. 2009), QUEST at DASI (QUaD; Brown et al. 2009; Friedman et al. 2009), the Atacama Cosmology Telescope (ACT; Swetz et al. 2010;…”
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CMB at 2 × 2 order: the dissipation of primordial acoustic waves and the observable part of the associated energy release (2012, background): “The effect of Silk damping today is observed by CMB anisotropy experiments (Larson et al. 2011; Reichardt et al. 2009; Keisler et al. 2011; Dunkley et al. 2011).”
THE BLANCO COSMOLOGY SURVEY: DATA ACQUISITION, PROCESSING, CALIBRATION, QUALITY DIAGNOSTICS, AND DATA RELEASE (2012, background): “The Blanco Cosmology Survey (BCS) is an optical photometric survey which was designed for this purpose and positioned to overlap the ACBAR, ACT, APEX and SPT surveys in the southern hemisphere.”