42 research outputs found
Planck 2013 results. XVII. Gravitational lensing by large-scale structure
On the arcminute angular scales probed by Planck, the cosmic microwave background (CMB) anisotropies are gently perturbed by gravitational lensing. Here we present a detailed study of this effect, detecting lensing independently in the 100, 143, and 217 GHz frequency bands with an overall significance of greater than 25Ï. We use thetemperature-gradient correlations induced by lensing to reconstruct a (noisy) map of the CMB lensing potential, which provides an integrated measure of the mass distribution back to the CMB last-scattering surface. Our lensing potential map is significantly correlated with other tracers of mass, a fact which we demonstrate using several representative tracers of large-scale structure. We estimate the power spectrum of the lensing potential, finding generally good agreement with expectations from the best-fitting ÎCDM model for the Planck temperature power spectrum, showing that this measurement at z = 1100 correctly predicts the properties of the lower-redshift, later-time structures which source the lensing potential. When combined with the temperature power spectrum, our measurement provides degeneracy-breaking power for parameter constraints; it improves CMB-alone constraints on curvature by a factor of two and also partly breaks the degeneracy between the amplitude of the primordial perturbation power spectrum and the optical depth to reionization, allowing a measurement of the optical depth to reionization which is independent of large-scale polarization data. Discarding scale information, our measurement corresponds to a 4% constraint on the amplitude of the lensing potential power spectrum, or a 2% constraint on the root-mean-squared amplitude of matter fluctuations at z ~ 2
Planck 2013 results. XXVIII. The Planck catalogue of compact sources
The Planck Catalogue of Compact Sources (PCCS) is the catalogue of sources detected in the first 15 months of Planck operations, the ânominalâ mission. It consists of nine single-frequency catalogues of compact sources, both Galactic and extragalactic, detected over the entire sky. The PCCS covers the frequency range 30â857âGHz with higher sensitivity (it is 90% complete at 180âmJy in the best channel) and better angular resolution (from 32.88âČ to 4.33âČ) than previous all-sky surveys in this frequency band. By construction its reliability is >80% and more than 65% of the sources have been detected in at least two contiguous Planck channels. In this paper we present the construction and validation of the PCCS, its contents and its statistical characterization
Planck 2018 results: VIII. Gravitational lensing
We present measurements of the cosmic microwave background (CMB) lensing
potential using the final 2018 temperature and polarization
data. We increase the significance of the detection of lensing in the
polarization maps from to . Combined with temperature,
lensing is detected at . We present an extensive set of tests of
the robustness of the lensing-potential power spectrum, and construct a
minimum-variance estimator likelihood over lensing multipoles . We find good consistency between lensing constraints and the results from
the CMB power spectra within the model.
Combined with baryon density and other weak priors, the lensing analysis alone
constrains (
errors). Also combining with baryon acoustic oscillation (BAO) data, we find
tight individual parameter constraints, ,
, and
. Combining with CMB
power spectrum data, we measure to better than precision,
finding . We find consistency with the lensing results
from the Dark Energy Survey, and give combined lensing-only parameter
constraints that are tighter than joint results using galaxy clustering. Using
cosmic infrared background (CIB) maps we make a combined
estimate of the lensing potential over of the sky with considerably
more small-scale signal. We demonstrate delensing of the
power spectra, detecting a maximum removal of of the lensing-induced
power in all spectra. The improvement in the sharpening of the acoustic peaks
by including both CIB and the quadratic lensing reconstruction is detected at
high significance (abridged)
Recommended from our members
Planck 2018 results: VIII. Gravitational lensing
We present measurements of the cosmic microwave background (CMB) lensing potential using the final Planck 2018 temperature and polarization data. Using polarization maps filtered to account for the noise anisotropy, we increase the significance of the detection of lensing in the polarization maps from 5Ï to 9Ï. Combined with temperature, lensing is detected at 40Ï. We present an extensive set of tests of the robustness of the lensingpotential power spectrum, and construct a minimum-variance estimator likelihood over lensing multipoles 8 †L †400 (extending the range to lower L compared to 2015), which we use to constrain cosmological parameters. We find good consistency between lensing constraints and the results from the Planck CMB power spectra within the ÏCDM model. Combined with baryon density and other weak priors, the lensing analysis alone constrains Ï8Ω0.25m= 0.589 ± 0.020 (1Ï errors). Also combining with baryon acoustic oscillation data, we find tight individual parameter constraints, Ï8 = 0.811 ± 0.019, H0 = 67.9+1.2-1.3km s-1Mpc-1, and m = 0.303+0.016-0.018. Combining with Planck CMB power spectrum data, we measure Ï8 to better than 1% precision, finding Ï8 = 0.811 ± 0.006. CMB lensing reconstruction data are complementary to galaxy lensing data at lower redshift, having a different degeneracy direction in Ï8 - m space; we find consistency with the lensing results from the Dark Energy Survey, and give combined lensing-only parameter constraints that are tighter than joint results using galaxy clustering. Using the Planck cosmic infrared background (CIB) maps as an additional tracer of high-redshift matter, we make a combined Planck-only estimate of the lensing potential over 60% of the sky with considerably more small-scale signal.We additionally demonstrate delensing of the Planck power spectra using the joint and individual lensing potential estimates, detecting a maximum removal of 40% of the lensing-induced power in all spectra. The improvement in the sharpening of the acoustic peaks by including both CIB and the quadratic lensing reconstruction is detected at high significance
Recommended from our members
Planck intermediate results: XLVIII. Disentangling Galactic dust emission and cosmic infrared background anisotropies
Using the Planck 2015 data release (PR2) temperature maps, we separate Galactic thermal dust emission from cosmic infrared background (CIB) anisotropies. For this purpose, we implement a specifically tailored component-separation method, the so-called generalized needlet internal linear combination (GNILC) method, which uses spatial information (the angular powerspectra) to disentangle the Galactic dust emission and CIB anisotropies. We produce significantly improved all-sky maps of Planck thermal dust emission, with reduced CIB contamination, at 353, 545, and 857 GHz. By reducing the CIB contamination of the thermal dust maps, we provide more accurate estimates of the local dust temperature and dust spectral index over the sky with reduced dispersion, especially at high Galactic latitudes above b = ±20°. We find that the dust temperature is T = (19.4 ± 1.3) K and the dust spectral index is ÎČ = 1.6 ± 0.1 averaged over the whole sky, while T = (19.4 ± 1.5) K and ÎČ = 1.6 ± 0.2 on 21% of the sky at high latitudes. Moreover, subtracting the new CIB-removed thermal dust maps from the CMB-removed Planck maps gives access to the CIB anisotropies over 60% of the sky at Galactic latitudes |b| > 20°. Because they are a significant improvement over previous Planck products, the GNILC maps are recommended for thermal dust science. The new CIB maps can be regarded as indirect tracers of the dark matter and they are recommended for exploring cross-correlations with lensing and large-scale structure optical surveys. The reconstructed GNILC thermal dust and CIB maps are delivered as Planck products