Statistics of the fractional polarization of compact radio sources in Planck maps

Bonavera, L.; González‐Nuevo, J.; Argüeso, F.; Toffolatti, L.

doi:10.1093/mnras/stx1020

Cited by 35 publications

(43 citation statements)

References 35 publications

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“…These results are consistent with the conclusion by Bonavera et al [127] who applied stacking techniques to radio sources detected by Planck in total intensity, finding an average fractional polarization of 3%, essentially independent of frequency from 30 to 353 GHz. A similar conclusion was reached by the independent analysis of Trombetti et al [128].…”

Section: Detecting Sources In Polarizationsupporting

confidence: 92%

Extragalactic Astrophysics With Next-Generation CMB Experiments

Zotti

Bonato

Negrello

et al. 2019

Front. Astron. Space Sci.

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Planck, SPT and ACT surveys have clearly demonstrated that Cosmic Microwave Background (CMB) experiments, while optimised for cosmological measurements, have made important contributions to the field of extragalactic astrophysics in the last decade. Future CMB experiments have the potential to make even greater contributions. One example is the detection of highz galaxies with extreme gravitational amplifications. The combination of flux boosting and of stretching of the images has allowed the investigation of the structure of galaxies at z 3 with the astounding spatial resolution of about 60 pc. Another example is the detection of proto-clusters of dusty galaxies at high z when they may not yet possess the hot intergalactic medium allowing their detection in X-rays or via the Sunyaev-Zeldovich effect. Next generation CMB experiments, like PICO, CORE, CMB-Bharat from space and Simons Observatory and CMB-S4 from the ground, will discover several thousands of strongly lensed galaxies out to z ∼ 6 or more and of 1 arXiv:1907.05323v1 [astro-ph.GA] 11 Jul 2019 De Zotti et al. Running Title Figure 1. Effect of angular resolution on the confusion limit. The filled blue circles show the differential counts of sources on SPT maps degraded to the PICO resolution at 150 GHz (FWHM = 6.2 ; left panel) and 220 GHz (FWHM = 3.6 ; right panel) compared with the SPT counts of Mocanu et al. [5, orange stars]. The vertical dot-dashed lines correspond, from left to right, to the 90% completeness limits at the full SPT resolution, at the PICO resolution and at the Planck resolution.galaxy proto-clusters caught in the phase when their member galaxies where forming the bulk of their stars. They will also detect tens of thousands of local dusty galaxies and thousands of radio sources at least up to z 5. Moreover they will measure the polarized emission of thousands of radio sources and of dusty galaxies at mm/sub-mm wavelengths.

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Section: Detecting Sources In Polarizationsupporting

confidence: 92%

Extragalactic Astrophysics With Next-Generation CMB Experiments

Zotti

Bonato

Negrello

et al. 2019

Front. Astron. Space Sci.

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“…Recently, Bonavera et al (2017;B17) have applied stacking to Planck maps to recover Π from 30 to 353 GHz of a primary sample of 1560 compact radio sources. The sources were selected in the PCCS2 at 30 GHz and were divided according to their location, i.e.…”

Section: Introductionmentioning

confidence: 99%

Statistics of the fractional polarization of extragalactic dusty sources in Planck HFI maps

Bonavera

González‐Nuevo

Marco

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We estimate the average fractional polarisation at 143, 217 and 353 GHz of a sample of 4697 extragalactic dusty sources by applying stacking technique. The sample is selected from the second version of the Planck Catalogue of Compact Sources at 857 GHz, avoiding the region inside the Planck Galactic mask (f sky ∼ 60 per cent). We recover values for the mean fractional polarisation at 217 and 353 GHz of (3.10±0.75) per cent and (3.65 ± 0.66) per cent, respectively, whereas at 143 GHz we give a tentative value of (3.52 ± 2.48) per cent. We discuss the possible origin of the measured polarisation, comparing our new estimates with those previously obtained from a sample of radio sources.We test different distribution functions and we conclude that the fractional polarisation of dusty sources is well described by a log-normal distribution, as determined in the radio band studies. For this distribution we estimate µ 217GHz = 0.3 ± 0.5 (that would correspond to a median fractional polarisation of Π med = (1.3 ± 0.7) per cent) and µ 353GHz = 0.7 ± 0.4 (Π med = (2.0 ± 0.8) per cent), σ 217GHz = 1.3 ± 0.2 and σ 353GHz = 1.1 ± 0.2. With these values we estimate the source number counts in polarisation and the contribution given by these sources to the CMB B-mode angular power spectrum at 217, 353, 600 and 800 GHz. We conclude that extragalactic dusty sources might be an important contaminant for the primordial B-mode at frequencies > 217 GHz.

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“…GHz frequencies, and overall mean p is estimated at a level around 1 − 5 per cent, which are all consistent with our findings in this work. For comparison, we show the squared values of polarisation fraction p 2 from Bonavera et al (2017a) and Trombetti et al (2018) (at 100 and 143 GHz Planck frequencies) in both panels of Fig 3. In the right panel, we also show p 2 measured by Datta et al (2018) at 148 GHz ACTpol observing frequency. On the dusty side, Bonavera et al (2017b) used Planck data to study ∼ 4700 dusty sources selected at 857 GHz with S ≥ 791 mJy (a flux threshold that is comparable to this work when extrapolated to 150 GHz).…”

Section: Comparison To Previous Resultsmentioning

confidence: 99%

“…In recent years, we have seen the first measurements of the polarisation properties of AGN at CMB frequencies, although these measurements have been restricted to the brightest AGN. Using data from the Planck satellite, Bonavera et al (2017a) found p = 2.9 +0.3 −0.5 per cent and Trombetti et al (2018) found p = 3.06 ± 0.28 per cent at 143 GHz for sources above 1 Jy and 525 mJy, respectively. An analysis of Atacama Cosmology Telescope (ACTpol) data found a consistent p = 2.8 ± 0.5 per cent for sources brighter than 215 mJy at 148 GHz (Datta et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Fractional polarization of extragalactic sources in the 500 deg2 SPTpol survey

Gupta

Reichardt

Ade

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We study the polarisation properties of extragalactic sources at 95 and 150 GHz in the SPTpol 500 deg 2 survey. We estimate the polarised power by stacking maps at known source positions, and correct for noise bias by subtracting the mean polarised power at random positions in the maps. We show that the method is unbiased using a set of simulated maps with similar noise properties to the real SPTpol maps. We find a flux-weighted mean-squared polarisation fraction p 2 = [8.9 ± 1.1] × 10 −4 at 95 GHz and [6.9 ± 1.1] × 10 −4 at 150 GHz for the full sample. This is consistent with the values obtained for a sub-sample of active galactic nuclei. For dusty sources, we find 95 per cent upper limits of p 2 95 < 16.9 × 10 −3 and p 2 150 < 2.6 × 10 −3 . We find no evidence that the polarisation fraction depends on the source flux or observing frequency. The 1-σ upper limit on measured mean squared polarisation fraction at 150 GHz implies that extragalactic foregrounds will be subdominant to the CMB E and B mode polarisation power spectra out to at least 5700 ( 4700) and 5300 ( 3600), respectively at 95 (150) GHz.

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Statistics of the fractional polarization of compact radio sources in Planck maps

Cited by 35 publications

References 35 publications

Extragalactic Astrophysics With Next-Generation CMB Experiments

Extragalactic Astrophysics With Next-Generation CMB Experiments

Statistics of the fractional polarization of extragalactic dusty sources in Planck HFI maps

Fractional polarization of extragalactic sources in the 500 deg2 SPTpol survey

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