eprintid: 17569
rev_number: 13
eprint_status: archive
userid: 1427
dir: disk0/00/01/75/69
datestamp: 2014-10-30 10:38:14
lastmod: 2014-10-30 11:36:05
status_changed: 2014-10-30 10:38:14
type: doctoralThesis
metadata_visibility: show
creators_name: Knežević, Sladjana
title: An Integral View of Shocks
subjects: 520
divisions: 130001
adv_faculty: af-13
abstract: The subject of this thesis are Balmer-dominated shocks around (super)novae. These are characterized by strong hydrogen emission lines with a narrow (~10km/s) and a broad (~1000km/s) component. Studying shock physics is important for improving distance estimates to (super)novae, for understanding their evolution and impact on the interstellar medium, and for obtaining insights into the cosmic ray origin in the remnants of supernovae. Two historical supernova remnants, SN 1006 and SN 1572 (Tycho), are investigated using high-resolution spectrophotometric imaging. Analyzing the widths and intensities of the narrow and broad H�alpha-line components, evidence of suprathermal protons – seeds of high-energy cosmic ray protons – is found in SN 1006. Those cause an underestimation of the estimated shock velocity and, hence, the distance to the remnant. In SN 1572, our observations indicate an additional intermediate-width (~100km/s) component, implying the presence of a broad-neutral precursor. Moreover, the narrow component is typically broader than the maximally expected 20 km/s and is sometimes even doublepeaked, which might be due to a cosmic-ray precursor or the shock geometry. The last part of the thesis
outlines how high-spatial resolution spectrographs can be used to study and better understand outflow mechanisms of novae, here of a classical nova FH Ser. Further development of shock models that include non-thermal physics, and their application to the data presented in this thesis, are expected to provide important constraints on hadronic cosmic ray properties.
date: 2014
id_scheme: DOI
id_number: 10.11588/heidok.00017569
ppn_swb: 1659402506
own_urn: urn:nbn:de:bsz:16-heidok-175691
date_accepted: 2014-10-17
advisor: HASH(0x564e1c298b70)
language: eng
bibsort: KNEZEVICSLANINTEGRAL2014
full_text_status: public
citation:   Knežević, Sladjana  (2014) An Integral View of Shocks.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/17569/2/PhDThesis_SladjanaKnezevic.pdf