In galaxy clusters the entropy distribution of the IntraCluster Plasma modulates the latter's equilibrium within the Dark Matter gravitational wells, as rendered by our Supermodel. We argue the entropy production at the boundary shocks to be reduced or terminated as the accretion rates of DM and intergalactic gas peter out; this behavior is enforced by the slowdown in the outskirt development at late times, when the Dark Energy dominates the cosmology while the outer wings of the initial perturbation drive the growth. In such conditions, we predict the ICP temperature profiles to steepen into the cluster outskirts. The detailed expectations from our simple formalism agree with the X-ray data concerning five clusters whose temperature profiles have been recently measured out to the virial radius. We predict steep temperature declines to prevail in clusters at low redshift, tempered only by rich environs including adjacent filamentary structures.

Lapi, A., Fusco Femiano, R., Cavaliere, A. (2011). Probing the astrophysics of cluster outskirts. ASTRONOMY & ASTROPHYSICS, 516, A34 [10.1051/0004-6361/201014218].

Probing the astrophysics of cluster outskirts

LAPI, ANDREA;CAVALIERE, ALFONSO
2011-01-01

Abstract

In galaxy clusters the entropy distribution of the IntraCluster Plasma modulates the latter's equilibrium within the Dark Matter gravitational wells, as rendered by our Supermodel. We argue the entropy production at the boundary shocks to be reduced or terminated as the accretion rates of DM and intergalactic gas peter out; this behavior is enforced by the slowdown in the outskirt development at late times, when the Dark Energy dominates the cosmology while the outer wings of the initial perturbation drive the growth. In such conditions, we predict the ICP temperature profiles to steepen into the cluster outskirts. The detailed expectations from our simple formalism agree with the X-ray data concerning five clusters whose temperature profiles have been recently measured out to the virial radius. We predict steep temperature declines to prevail in clusters at low redshift, tempered only by rich environs including adjacent filamentary structures.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/05 - Astronomia e Astrofisica
English
http://hdl.handle.net/1963/3917
Lapi, A., Fusco Femiano, R., Cavaliere, A. (2011). Probing the astrophysics of cluster outskirts. ASTRONOMY & ASTROPHYSICS, 516, A34 [10.1051/0004-6361/201014218].
Lapi, A; Fusco Femiano, R; Cavaliere, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/8396
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