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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2019

Detection of intercluster gas in superclusters using the thermal Sunyaev–Zel’dovich effect

Résumé

Using a thermal Sunyaev–Zel’dovich (tSZ) signal, we search for hot gas in superclusters identified using the Sloan Digital Sky Survey Data Release 7 (SDSS/DR7) galaxies. We stack a Comptonization y map produced by the Planck Collaboration around the superclusters and detect the tSZ signal at a significance of 6.4σ. We further search for an intercluster component of gas in the superclusters. For this, we remove the intracluster gas in the superclusters by masking all galaxy groups/clusters detected by the Planck tSZ, ROSAT X-ray, and SDSS optical surveys down to a total mass of 1013 M⊙. We report the first detection of intercluster gas in superclusters with y = (3.5 ± 1.4) × 10−8 at a significance of 2.5σ. Assuming a simple isothermal and flat density distribution of intercluster gas over superclusters, the estimated baryon density is (Ωgas/Ωb)×(Te/8 × 106 K) = 0.067 ± 0.006 ± 0.025. This quantity is inversely proportional to the temperature, therefore taking values from simulations and observations, we find that the gas density in superclusters may account for 17–52% of missing baryons at low redshifts. A better understanding of the physical state of gas in the superclusters is required to accurately estimate the contribution of our measurements to missing baryons.Key words: cosmology: observations / large-scale structure of Universe
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Dates et versions

hal-01806941 , version 1 (21-08-2020)

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H. Tanimura, N. Aghanim, M. Douspis, A. Beelen, V. Bonjean. Detection of intercluster gas in superclusters using the thermal Sunyaev–Zel’dovich effect. Astronomy and Astrophysics - A&A, 2019, 625, pp.A67. ⟨10.1051/0004-6361/201833413⟩. ⟨hal-01806941⟩
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