| Titel | Testing X-Ray Scaling Relations with a Sample of Chandra Galaxy Groups and Detailed Analysis of A2244 with Chandra and Suzaku |
|---|---|
| Autor | Helen J. Eckmiller |
| Publikationsform | Dissertation |
| Abstract | Groups and clusters of galaxies are valuable tools for cosmology,
especially with respect to their mass and other
global properties. Individual clusters are also useful to study the complex
gravitational and non-gravitational
physics involved in their
formation. The first part of this work deals with a sample of galaxy
groups and its use
for cosmology, while in the second part a single
cluster is analyzed to gain information about its individual
properties and formation history.
The first part is motivated as follows. Well-determined scaling relations between X-ray observables and cluster mass are essential for using large cluster samples to constrain fundamental cosmological parameters. Scaling relations between cluster masses and observables, such as the luminosity-temperature, mass-temperature, luminosity-mass relations, have been investigated extensively, however the question of whether these relations hold true also for poor clusters and groups remains unsettled. Some evidence supports a "break" at the low end of the group/cluster mass range, possibly caused by the stronger influence of non-gravitational physics on low-mass systems. The main goal of this part of the thesis is to test local scaling relations for the low-mass range in order to check whether or not there is a systematic difference between clusters and groups, and to thereby extend this method of reliable and convenient cluster mass determination for future large samples down to the group regime. more... |
| Inhaltsverzeichnis | pdf-Dokument  |
| pdf-Dokument (12 MB) pdf-Dokument (mit niedrigerer Auflösung: 5 MB) |