Extracting the thermal SZ signal from heterogeneous millimeter data sets

Bourdin, H.; Baldi, A.; Kozmanyan, A.; Mazzotta, P.

doi:10.1051/epjconf/202022800007

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…The intercluster filament has also recently been confirmed and studied in detail with eROSITA (Reiprich et al 2021). Furthermore, this network has been mapped by Chandra and through the thermal Sunyaev-Zel'dovich (SZ) effect using the Planck High Frequency Instrument by Bourdin et al (2020), which clearly shows the intercluster filament connected to the ICM of both clusters. These clusters are thought to have already begun interacting via this filament and might be at a pre-merger stage (Sugawara et al 2017).…”

Section: Introductionmentioning

confidence: 74%

“…Guided by the literature (Tittley & Henriksen 2001;Lakhchaura et al 2011;Planck Collaboration et al 2013;Bourdin et al 2020;Reiprich et al 2021), we studied Regions A, B, and C in detail with the assumption that these regions may represent an interface of the A3395 ICM and the intercluster filament. 4 cm −3 for the intercluster filament.…”

Section: On the Intercluster Filamentmentioning

confidence: 99%

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The NuSTAR, XMM-Newton, and Suzaku View of A3395 at the Intercluster Filament Interface

Tümer

Wik

Gaspari

et al. 2022

ApJ

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Galaxy clusters are the largest virialized objects in the universe. Their merger dynamics and their interactions with the cosmic filaments that connect them are important for our understanding of the formation of large-scale structure. In addition, cosmic filaments are thought to possess the missing baryons in the universe. Studying the interaction of galaxy clusters and filaments therefore has the potential to unveil the origin of the baryons and the physical processes that occur during merger stages of galaxy clusters. In this paper, we study the connection between A3395 and the intercluster filament with NuSTAR, XMM-Newton, and Suzaku data. Since the NuSTAR observation is moderately contaminated by scattered light, we present a novel technique developed for disentangling this background from the emission from the intracluster medium. We find that the interface of the cluster and the intercluster filament connecting A3395 and A3391 does not show any signs of heated plasma, as was previously thought. This interface has low temperature, high density, and low entropy, thus we suggest that the gas is cooling, being enhanced by the turbulent or tidal “weather” driven during the early stage of the merger. Furthermore, our temperature results from the NuSTAR data are in agreement with those from XMM-Newton and from joint NuSTAR and XMM-Newton analysis for a region with ∼25% scattered light contamination within 1σ. We show that the temperature constraint of the intracluster medium is valid even when the data are contaminated up to ∼25% for ∼5 keV cluster emission.

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Section: Introductionmentioning

confidence: 74%

Section: On the Intercluster Filamentmentioning

confidence: 99%

The NuSTAR, XMM-Newton, and Suzaku View of A3395 at the Intercluster Filament Interface

Tümer

Wik

Gaspari

et al. 2022

ApJ

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“…The tSZ signal is subdominant relative to the CMB and other foreground emissions in the Planck frequency bands. Thus tailored component separation algorithms are required to reconstruct the tSZ map (i.e., Remazeilles et al 2011;Hurier et al 2013;Bourdin et al 2020;Bonjean 2020). We adopted the MILCA (Modified Internal Linear Combination Algorithm) (Hurier et al 2013) used for one of the Planck 𝑦-map reconstructions in Planck Collaboration (2016a) and mostly followed their reconstruction procedure (the difference in the procedure is summarized at the end of Sect.…”

Section: Tsz Reconstructionmentioning

confidence: 99%

“…The thermal Sunyaev-Zel'dovich (tSZ) effect (Sunyaev & Zeldovich 1972) is due to the inverse Compton scattering of cosmic microwave background (CMB) photons by hot electrons along the line of sight and in particular in clusters of galaxies. The tSZ effect has been measured by the Planck satellite, the Atacama Cosmology Telescope (ACT), and the South Pole Telescope (SPT) in a large field, and Compton parameter maps (i.e., Planck Collaboration 2014b, 2016aAghanim et al 2019;Madhavacheril et al 2020;Bleem et al 2021), referred to as 𝑦-map, have been constructed thanks to optimized component separation methods (i.e., Remazeilles et al 2011;Hurier et al 2013;Bourdin et al 2020;Bonjean 2020).…”

Section: Introductionmentioning

confidence: 99%

Constraining cosmology with a new all-sky Compton parameter map from the Planck PR4 data

Tanimura,

Douspis,

Aghanim

et al. 2021

Preprint

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We constructed a new all-sky Compton parameter map (𝑦-map) of the thermal Sunyaev-Zel'dovich (tSZ) effect from the 100 to 857 GHz frequency channel maps delivered within the Planck data release 4. The improvements in terms of noise and systematic effects translated into a 𝑦-map with a noise level smaller by ∼7% compared to the maps released in 2015, and with significantly reduced survey stripes. The produced 2020 𝑦-map is also characterized by residual foreground contamination, mainly due to thermal dust emission at large angular scales and to CIB and extragalactic point sources at small angular scales. Using the new Planck data, we computed the tSZ angular power spectrum and found that the tSZ signal dominates the 𝑦-map in the multipole range, 60 < ℓ < 600. We performed the cosmological analysis with the tSZ angular power spectrum and found 𝑆 8 = 0.764 +0.015 −0.018 (𝑠𝑡𝑎𝑡) +0.031 −0.016 (𝑠𝑦𝑠), including systematic uncertainties from a hydrostatic mass bias and pressure profile model. The 𝑆 8 value may differ by ±0.016 depending on the hydrostatic mass bias model and by +0.021 depending on the pressure profile model used for the analysis. The obtained value is fully consistent with recent KiDS and DES weak-lensing observations. While our result is slightly lower than the Planck CMB one, it is consistent with the latter within 2𝜎.

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LiteBIRD science goals and forecasts. Mapping the hot gas in the Universe

Remazeilles,

Douspis,

Rubiño-Martín

et al. 2024

J. Cosmol. Astropart. Phys.

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We assess the capabilities of the LiteBIRD mission to map the hot gas distribution in the Universe through the thermal Sunyaev-Zeldovich (SZ) effect. Our analysis relies on comprehensive simulations incorporating various sources of Galactic and extragalactic foreground emission, while accounting for the specific instrumental characteristics of the LiteBIRD mission, such as detector sensitivities, frequency-dependent beam convolution, inhomogeneous sky scanning, and 1/f noise. We implement a tailored component-separation pipeline to map the thermal SZ Compton y-parameter over 98% of the sky. Despite lower angular resolution for galaxy cluster science, LiteBIRD provides full-sky coverage and, compared to the Planck satellite, enhanced sensitivity, as well as more frequency bands to enable the construction of an all-sky thermal SZ y-map, with reduced foreground contamination at large and intermediate angular scales. By combining LiteBIRD and Planck channels in the component-separation pipeline, we also obtain an optimal y-map that leverages the advantages of both experiments, with the higher angular resolution of the Planck channels enabling the recovery of compact clusters beyond the LiteBIRD beam limitations, and the numerous sensitive LiteBIRD channels further mitigating foregrounds. The added value of LiteBIRD is highlighted through the examination of maps, power spectra, and one-point statistics of the various sky components. After component separation, the 1/f noise from LiteBIRD's intensity channels is effectively mitigated below the level of the thermal SZ signal at all multipoles. Cosmological constraints on S 8 = σ 8 (Ωm /0.3)0.5 obtained from the LiteBIRD-Planck combined y-map power spectrum exhibits a 15 % reduction in uncertainty compared to constraints derived from Planck alone. This improvement can be attributed to the increased portion of uncontaminated sky available in the LiteBIRD-Planck combined y-map.

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Extracting the thermal SZ signal from heterogeneous millimeter data sets

Cited by 4 publications

References 10 publications

The NuSTAR, XMM-Newton, and Suzaku View of A3395 at the Intercluster Filament Interface

The NuSTAR, XMM-Newton, and Suzaku View of A3395 at the Intercluster Filament Interface

Constraining cosmology with a new all-sky Compton parameter map from the Planck PR4 data

LiteBIRD science goals and forecasts. Mapping the hot gas in the Universe

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