eprintid: 2114
rev_number: 8
eprint_status: archive
userid: 1
dir: disk0/00/00/21/14
datestamp: 2002-05-21 00:00:00
lastmod: 2014-04-03 11:50:06
status_changed: 2012-08-14 15:03:55
type: doctoralThesis
metadata_visibility: show
creators_name: Krause, Martin
title: On the Interaction of Jets with the Dense Medium of the Early Universe
title_de: Ueber die Wechselwirkung von Jets mit dem dichten Medium des fruehen Universums
ispublished: pub
subjects: 530
divisions: 714300
adv_faculty: af-13
keywords: Radiogalaxien , fruehes Universum , Hydrodynamik , Kuehlungradio galaxies , early universe , simulation , jet , cooling
cterms_swd: Jet <Astronomie>
cterms_swd: Astrophysik
cterms_swd: Aktiver galaktischer Kern
cterms_swd: Computersimulation
note: Teile in: Astronomy & Astrophysics
abstract_translated_text: In recent years, radio galaxies have been found at redshifts above five. They differ in higher radio power and emission line characteristics from sources nearby. To understand these centers of proto-galaxy-clusters, hydrodynamic jets with cooling were simulated. After validation of the 3D code NIRVANA by comparison with literature simulations, an adiabatic 2D parameter study in the relevant regime (density contrast jet/medium eta=10^{-2}-10^{-5} was performed. Characteristic cocoon shape and broadenings were found. The radial expansion can be analytically approximated by a spherical blast wave with constant energy injection. In a non-equilibrium simulation the bow shock cooled to 10^4 K during jet propagation time (external density 1 ccm. After global cooling and compression, the bow shock turned into a big absorber which fragmented, and should form stars in typically 10^4 globular clusters of 10^6 solar masses. Filamentation and fragmentation was confirmed at high resolution. Absorbers in far-off radio galaxies and globular cluster excesses in nearby CD galaxies can be explained that way. With literature parameters fo Cygnus~A, a 3D simulation, for the first time with counter-jet, was performed. The bow shock shows two clearly separated phases, also evident in observation. Basic jet parameters have been derived. The simulation shows characteristic X-ray features (rings) which were identified and interpreted in two sources (M87). 
abstract_translated_lang: eng
date: 2002
date_type: published
id_scheme: DOI
id_number: 10.11588/heidok.00002114
portal_cluster_id: p-zah
portal_order: 02114
ppn_swb: 1643295470
own_urn: urn:nbn:de:bsz:16-opus-21145
date_accepted: 2002-05-15
advisor: HASH(0x556120a9d1e0)
language: eng
bibsort: KRAUSEMARTONTHEINTER2002
full_text_status: public
citation:   Krause, Martin  (2002) On the Interaction of Jets with the Dense Medium of the Early Universe.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/2114/1/Dissertation_MK.pdf