VLSS J0318.9+5755 (the Treble Clef) is a radio phoenix with ultra-steep spectrum in a massive merging cluster at z≈0.117 in the Zone of Avoidance, shaped by ICM gas motions that may also power a candidate radio halo.
The universal galaxy cluster pressure profile from a representative sample of nearby systems (REXCESS) and the Y_SZ-M_500 relation
10 Pith papers cite this work. Polarity classification is still indexing.
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abstract
(abridged) We investigate the regularity of cluster pressure profiles with REXCESS, a representative sample of 33 local clusters observed with XMM-Newton. The sample spans a mass range of 10^14 M_sun <M_500<10^15 M_sun. We derive an average profile from observations scaled by mass and z according to the standard self-similar model, and find that the dispersion about the mean is remarkably low beyond 0.2R_500, but increases towards the centre. Deviations about the mean are related to both the mass and the thermo-dynamical state of the cluster. Unrelaxed systems have systematically shallower profiles while cooling core systems are more concentrated. The scaled profiles exhibit a residual mass dependence with a slope of about 0.12; however, the departure from standard scaling decreases with radius and is consistent with zero at R_500. The scatter in the core and departure from self-similar mass scaling is smaller compared to that of the entropy profiles, showing that the pressure is the quantity least affected by dynamical history and non-gravitational physics. Comparison with several state of the art numerical simulations shows good agreement outside the core. Combining the observational data below R_500 with simulation data above, we derive the universal pressure profile, that, in an analytical form, defines the physical pressure profile of clusters as a function of mass and z up to the cluster 'boundary'. Using this profile and the observed pressure profiles, we investigate the scaling properties of the integrated Compton parameter Y, considering both the spherically integrated quantity and the cylindrically integrated quantity, directly related to the Sunyaev-Zel'dovich (SZ) effect signal. We further derive the expected Y_SZ-M_500 and Y_SZ-L_X relations for any aperture.
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representative citing papers
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MINOT modeling of Abell 3667 predicts a hadronic 1–300 GeV flux of ~1.15e-10 cm^-2 s^-1 at 3.7 R500, matching Fermi-LAT, with ~76% of flux outside R500 and IC subdominant by ~20.
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The SKA will enable high-resolution, high-sensitivity observations of the thermal SZ effect in massive halos, capturing both pressure substructures and large-scale ICM emission.
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ComPACT: Mass-Redshift Properties of the galaxy cluster catalogue
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The SKA View of the Sunyaev-Zeldovich Effect from Massive Cosmic Halos
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