I have studied entropy profiles obtained in a sample of 24 X-ray objects at high
redshift retrieved from the Chandra archive. I have discussed the scaling
properties of the entropy S, the correlation between metallicity Z and S, the
profiles of the temperature of the gas, Tgas, and performed a comparison between the
dark matter 'temperature' and Tgas in order to constrain the non-gravitational
processes which affect the thermal history of the gas. Furthermore I have studied
the scaling relations between the X-ray quantities and Sunyaev Zel'dovich
measurements. I have observed that X-ray laws are steeper than the relations
predicted from the adiabatic model. These deviations from expectations based on
self-similarity are usually interpreted in terms of feedback processes leading to
non-gravitational gas heating, and suggesting a scenario in which the ICM at higher
redshift has lower both X-ray luminosity and pressure in the central regions than
the expectations from self-similar model. I have also investigated a Bayesian X-ray
and Sunyaev Zel'dovich analysis, which allows to study the external regions of the
clusters well beyond the volumes resolved with X-ray observations (1/3-1/2 of the
virial radius), to measure the deprojected physical cluster properties, like
temperature, density, entropy, gas mass and total mass up to the virial radius.
| Identifer | oai:union.ndltd.org:unibo.it/oai:amsdottorato.cib.unibo.it:633 |
| Date | 28 March 2008 |
| Creators | Morandi, Andrea <1979> |
| Contributors | Moscardini, Lauro |
| Publisher | Alma Mater Studiorum - Università di Bologna |
| Source Sets | Università di Bologna |
| Language | English |
| Detected Language | English |
| Type | Doctoral Thesis, PeerReviewed |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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