Mathematics – Logic
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phdt........16p&link_type=abstract
Thesis (PhD). PRINCETON UNIVERSITY, Source DAI-B 63/10, p. 4722, Apr 2003, 147 pages.
Mathematics
Logic
2
Scientific paper
This thesis seeks to address the missing baryon problem i.e., the present day location of the bulk of the hydrogen and helium produced in the big bang and observed directly (in absorption) at moderate redshifts, by simulating the X-ray properties of the Warm/Hot Intergalactic Medium (WHIM) in the filamentary network. Cosmological hydrodynamic simulations predict that a significant fraction, up to 40%, of the baryons in the local universe could be in the WHIM. Observational evidence for the WHIM has proliferated in the past few years, with detections in Far-UV AGN absorption spectra, tentative observations of soft X-ray filamentary emission and the possible discerning of a WHIM contribution in the X-ray background (XRB) autocorrelation and cross- correlation with the galaxy distribution. We derive quantitative predictions of the X-ray signature of the WHIM in order to aid in the interpretation of existing observations and inform the analysis of the wealth of X- ray observations that will become available in the next decade. Using large-scale hydrodynamic simulations and model spectra for optically thin plasma, we obtain the predicted integrated spectrum from the WHIM as well as maps of the expected distribution of the WHIM X-ray emission. The latter are used to determine the contribution of the WHIM to the autocorrelation of the XRB and its correlation with the galaxy distribution. These are discussed in the context of existing observational results. Our predictions of the contribution of the WHIM to the XRB are in accord with existing observational constraints and point to the indirect detection of this component in the XRB correlations. The simulations also suggest future observations that will help detect and characterize the Warm/Hot Intergalactic Medium, where a significant fraction of the ordinary matter in the universe may reside.
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