Browsing by Subject "Spektren und Leuchtkraft von Sternsystemen {Astronomie}"
Now showing items 1-16 of 16
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Cosmic rays and the magnetic field in the nearby starburst galaxy NGC 253
(Univ. Bochum, 2008)Beim Ras-RasGAP-Komplex ist die Hydrolyse des Guanosintriphosphats stark beschleunigt im Vergleich zu Ras allein. Dies wird hauptsächlich durch den Argininfinger R789 verursacht, der direkt zur Triphosphatgruppe zeigt. ... -
Dissecting the host galaxies of active galactic nuclei at high angular resolution
(Univ. Köln, 2007)The work presented here is concerned with issues related to the interplay of galaxy structure and the accretion phenomenon onto supermassive black holes (SMBH), i.e. active galactic nuclei (AGN). There is statistical ... -
High resolution multi-wavelength study of active galaxies
(Univ. Köln, 2005)This PhD thesis presents a study of active galaxies carried out from cm- to mm-wavelengths with high angular resolution. The mechanism of the activity in these objects is supposed to be strongly correlated with the accretion ... -
Merger dynamics and stellar populations in the host galaxies of the quasi-stellar objects I Zw 1 and 3C 48
(Univ. Köln, 2005)The thesis focuses on two case studies of the host galaxies of the quasi-stellar objects (QSOs) I Zw 1 and 3C 48. The studies are motivated by the hypothesis that ultra-luminous infrared galaxies (ULIRGs) might represent ... -
Near- and mid-infrared studies of the galactic center and Sagittarius A*
(Univ. Köln, 2007)The focus of this thesis lies on the analysis and interpretation of near- and mid-infrared images of the Galactic center, with a view to improving the understanding of this region, especially at longer wavelengths. Multi-band ... -
New constraints on the density of the extragalactic background light and the discovery of TeV g-rays [gamma-rays] from the BL Lac 1ES 0347-121 and the extended source HESS J1023-575
(Univ. Hamburg, 2007)Die H.E.S.S. Kollaboration betreibt ein stereoskopisches System aus vier großen abbildenden Cherenkov-Teleskopen für den Nachweis sehr hochenergetischer Gamma-Strahlung (VHE; > 100 GeV). In dieser Arbeit wird über den ... -
Probing quasar sight lines in three dimensions
(Univ. Potsdam, 2005)Strong damped Lyman alpha absorption (DLA) lines seen spectra of distant quasar are believed to arise when the sight line to the quasar goes trough the disc of a galaxy or a proto galaxy. Most of the neutral matter in the ... -
Search for tidal streams in disk and halo
(Univ. Bochum, 2008)This work deals with the search for substructures in four nearby galaxies (NGC 300, NGC 7793, M 33, M 83) in which it is possible to resolve single stars in their outer parts.The search is based on the photometry of wide ... -
Star formation history of low surface brightness galaxies in the HDFS
(Univ. Bochum, 2005)I presented the first study of the SFH of LSB galaxies by using integrated spectra. The analyzed sample was derived during a search for LSBs in the HDFS. The selection was done using a new method based on the locations of ... -
The ISO-2MASS AGN survey
(Univ. Bochum, 2006)Bei der Suche nach AGN im Optischen/UV werden kaum staubgerötete Objekte gefunden. Jedoch ist vom Radio/Röntgen-Bereich die Existenz solcher AGN bekannt. Da der obskurierende Staub die absorbierte Energie im Infraroten ... -
The LRS double prism assembly to be flown on the James Webb Space Telescope and host galaxies of active galactic nuclei in the near infrared
(Univ. Köln, 2008)The work presented in my thesis covers two aspects of modern astronomy: Observations and instrumentation. Part I of this thesis addresses the design, the development and the qualification of the Low Resolution Spectroscopy ... -
The LUCIFER control software - operational and observational characteristics and NIR spectroscopy of galaxy centers
(Univ. Bochum, 2009)Die Dissertation behandelt die Konzepte sowie die Implementierung der operativen Aspekte der Kontrollsoftware des LUCIFER Instruments. Diese ist in vier Schichten aufgeteilt. Die Schnittstelle zwischen Software und Hardware ... -
The metagalactic UV background at z < 3
(Univ. Hamburg, 2005)The high ionization state of the intergalactic medium (IGM) is maintained by the metagalactic UV background radiation. This ionizing radiation field is supposed to be the integrated radiation of quasars and young star-forming ... -
The narrow line region of active galaxies
(Univ. Bochum, 2005)This thesis presents an imaging and spectroscopic study of the narrow-line region (NLR) in active galactic nuclei (AGNs). We find a correlation between size and luminosity of the NLR with different slopes for type-1 and ... -
The transverse proximity effect in quasar spectra
(Univ. Potsdam, 2008)The intergalactic medium is kept highly photoionised by the intergalactic UV background radiation field generated by the overall population of quasars and galaxies. In the vicinity of sources of UV photons, such as luminous ... -
The vertical structure of thickened bars in disk galaxies
(Univ. Bochum, 2006)In der vorliegenden Dissertation wird die vertikale Struktur von edge-on Scheibengalaxien mit einer 'box or peanut shaped' (B/PS) Struktur in der Bulgeregion unter Verwendung von nahinfrarot Beobachtungen untersucht. Durch ...
