SIMBAD references

2012ApJ...745L..15L - Astrophys. J., 745, L15 (2012/January-3)

The intracluster plasma: a universal pressure profile?


Abstract (from CDS):

The pressure profiles of the intracluster plasma in galaxy clusters show a wide variance when observed in X-rays at low redshifts, z ≲ 0.2. We find the profiles to follow two main patterns, featuring either a steep or a shallow shape throughout both core and outskirts. We trace these shapes back to a physical dichotomy of clusters into two classes, marked by either low entropy (LE) or high entropy (HE) throughout. From X-ray observations and Sunyaev-Zel'dovich (SZ) stacked data at higher redshifts 0.2 ≲ z ≲ 0.4, we obtain evidence of an increasing abundance of HEs relative to LEs. We propose this to constitute a systematic trend toward high z; specifically, we predict the pressure profiles to converge into a truly universal HE-like template for z ≳ 0.5. We submit our physical templates and converging trend for further observational tests, in view of current and upcoming measurements of individual, stacked, and integrated SZ signals.

Abstract Copyright:

Journal keyword(s): cosmic background radiation - galaxies: clusters: general - methods: analytical - X-rays: galaxies: clusters

Simbad objects: 7

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2012ApJ...745L..15L and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact