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  • Hochschulschriften (Astronomie, Astrophysik, Weltraumforschung) Alle Dokumente nach Erscheinungsdatum
    by the cosmic UV background radiation field Primarily composed of the integrated contribution of quasars and young Hydrogen deficient central stars of planetary nebulae Todt Helge Univ Potsdam 2009 Central stars of planetary nebulae are low mass stars on the brink of their final evolution towards white dwarfs Because of their surface temperature of above 25 000 K their UV radiation ionizes the surrounding material Heating of the corona in a 3D MHD forward model approach Bingert Sven Univ Freiburg Breisgau 2009 Observations of the solar corona show loop like structures formed by plasma at temperatures of one million degrees and higher Since the solar surface is much cooler than the corona a heating mechanism must be responsible Accretion winds and jets high energy emission from young stellar objects Günther Hans Moritz Univ Hamburg 2009 This thesis deals with the high energy emission from young stellar objects which are on the one hand still actively accreting from their disk and on the other hand are no longer deeply obscured by their natal cloud Stars The upper atmospheric fountain effect in the polar cusp region Rentz Stefanie GFZ Helmholtz Zentrum Potsdam 2009 This thesis examines how the cusp as a feature of the Earth Magnetic Field influences the neutral upper atmospheric dynamics The thermospheric total mass density as derived from CHAMP satellite data shows a distinct Searching for solar axions in the eV mass region with the CCD detector at CAST Vogel Julia Katharina Univ Freiburg Breisgau 2009 The CERN Axion Solar Telescope CAST is searching for solar axions which could be produced in the core of the Sun via the so called Primakoff effect For this purpose CAST uses a decommissioned LHC prototype magnet In The central parsec of the milky way at 3 8 micrometer Mužić Koraljka Univ Köln 2008 The central part of the Milky Way is a unique environment where an interplay of different astrophysical phenomena can be studied starting from the physics of the interstellar medium stellar physics and star formation Search for neutrino induced cascades with 5 years of the AMANDA II data Actis Oxana Univ Berlin 2008 Das Antarctic Muon And Neutrino Detector Array AMANDA ist ein Cherenkov Detektor der sich im Gletscher der Antarktis am Südpol befindet Wir präsentieren die Analyse von Daten die in den Jahren 2000 bis 2004 gesammelt Non analytical line profiles in stellar atmospheres for planetary host star systems Johnas Christine M S Univ Hamburg 2008 In this work nonanalytical line profiles for both cool and hot dense atmospheres are added to the opacity calculations of the multipurpose stellar atmosphere code PHOENIX Their influence on model atmospheres and synthetic LINC NIRVANA piston control and near infrared polarization images of the Orion proplyds Rost Steffen Univ Köln 2008 This thesis is focussed on the development of optimized techniques to overcome limitations of astrophysical observations The goal is an optimal signal estimation in noisy measurements by the consideration of underlying Suche nach dunkler Materie mit den H E S S Cherenkov

    Original URL path: http://e-docs.geo-leo.de/handle/11858/1489/browse?order=DESC&rpp=20&sort_by=1&etal=-1&offset=20&type=dateissued (2016-02-15)
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  • The fate of singularities in quantum cosmology and the application of generalized effective equations to constrained quantum systems
    Quantenkosmologie Astronomie Kosmologie Zur Langanzeige Zusammenfassung The first part of the thesis is concerned with the fate of singularities in quantum cosmology The second part addresses the derivation of predictions from quantum cosmology In the first part two classes of cosmological models were studied In the first class of models the universe evolves to or emerges from a big rip singularity Here energy density pressure and scale factor diverge after a finite amount of time This type of singularity arises rather generically in cosmological models with phantom dark energy For each of these phantom field models the corresponding scenario with ordinary scalar field was studied The scalar field induced a big bang singularity The second class of models studied was dominated by a big brake singularity At the big brake the universe evolution comes to a halt due to an infinite deceleration The motivation behind this choice of models was the occurrence of a singularity at large scale factor The major question pursued was whether these types of singularity were resolved on the quantum level If such singularities were resolved in quantum cosmology this would imply that quantum gravitational effects can occur in the macroscopic universe After devising classical models

    Original URL path: http://e-docs.geo-leo.de/handle/11858/00-1735-0000-0001-308F-4 (2016-02-15)
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  • Constraining the UV background with the proximity effect
    photoionisation level by the cosmic UV background radiation field Primarily composed of the integrated contribution of quasars and young star forming galaxies its intensity is subject to spatial and temporal fluctuations In particular in the vicinity of luminous quasars the UV radiation intensity grows by several orders of magnitude Due to an enhanced UV radiation up to a few Mpc from the quasar the ionised hydrogen fraction significantly increases and

    Original URL path: http://e-docs.geo-leo.de/handle/11858/00-1735-0000-0001-3093-9 (2016-02-15)
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  • Hochschulschriften (Astronomie, Astrophysik, Weltraumforschung) Alle Dokumente nach Autor
    Z Oder geben Sie die ersten Buchstaben ein Sortierung aufsteigend absteigend Ergebnisse 5 10 20 40 60 80 100 Anzeige der Dokumente 19 38 von 176 Vorherige Seite Nächste Seite Autorenname Christensen Lise Bech Curtef Valentin Dall Aglio Aldo Dedner Andreas Dexheimer Verônica Antocheviz Dominis Dijana Elwert Torsten August Wilhelm Heinrich Emprechtinger Martin Engel Dirk Eymeren Janine Fechner Cora Ferreira Elisa Merkel Fiřt Roman Fischer Sebastian Fontenla Roberta María Menéndez

    Original URL path: http://e-docs.geo-leo.de/handle/11858/1489/browse?rpp=20&order=ASC&sort_by=-1&etal=-1&type=author&starts_with=C (2016-02-15)
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  • Hochschulschriften (Astronomie, Astrophysik, Weltraumforschung) Alle Dokumente nach Autor
    Oder geben Sie die ersten Buchstaben ein Sortierung aufsteigend absteigend Ergebnisse 5 10 20 40 60 80 100 Anzeige der Dokumente 21 40 von 176 Vorherige Seite Nächste Seite Autorenname Dall Aglio Aldo Dedner Andreas Dexheimer Verônica Antocheviz Dominis Dijana Elwert Torsten August Wilhelm Heinrich Emprechtinger Martin Engel Dirk Eymeren Janine Fechner Cora Ferreira Elisa Merkel Fiřt Roman Fischer Sebastian Fontenla Roberta María Menéndez Fuhrmeister Birgit Gál Csaba Gasselt Stephan

    Original URL path: http://e-docs.geo-leo.de/handle/11858/1489/browse?rpp=20&order=ASC&sort_by=-1&etal=-1&type=author&starts_with=D (2016-02-15)
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  • Hochschulschriften (Astronomie, Astrophysik, Weltraumforschung) Alle Dokumente nach Autor
    Oder geben Sie die ersten Buchstaben ein Sortierung aufsteigend absteigend Ergebnisse 5 10 20 40 60 80 100 Anzeige der Dokumente 25 44 von 176 Vorherige Seite Nächste Seite Autorenname Elwert Torsten August Wilhelm Heinrich Emprechtinger Martin Engel Dirk Eymeren Janine Fechner Cora Ferreira Elisa Merkel Fiřt Roman Fischer Sebastian Fontenla Roberta María Menéndez Fuhrmeister Birgit Gál Csaba Gasselt Stephan Geenen Heiko Gerlach Enrico Ghadikolaei Iraj Gholami Goosmann René W

    Original URL path: http://e-docs.geo-leo.de/handle/11858/1489/browse?rpp=20&order=ASC&sort_by=-1&etal=-1&type=author&starts_with=E (2016-02-15)
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  • Hochschulschriften (Astronomie, Astrophysik, Weltraumforschung) Alle Dokumente nach Autor
    Y Z Oder geben Sie die ersten Buchstaben ein Sortierung aufsteigend absteigend Ergebnisse 5 10 20 40 60 80 100 Anzeige der Dokumente 29 48 von 176 Vorherige Seite Nächste Seite Autorenname Fechner Cora Ferreira Elisa Merkel Fiřt Roman Fischer Sebastian Fontenla Roberta María Menéndez Fuhrmeister Birgit Gál Csaba Gasselt Stephan Geenen Heiko Gerlach Enrico Ghadikolaei Iraj Gholami Goosmann René W Gressel Oliver Grießmeier Jean Mathias Groß Andreas Günther Hans

    Original URL path: http://e-docs.geo-leo.de/handle/11858/1489/browse?rpp=20&order=ASC&sort_by=-1&etal=-1&type=author&starts_with=F (2016-02-15)
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  • Hochschulschriften (Astronomie, Astrophysik, Weltraumforschung) Alle Dokumente nach Autor
    V W X Y Z Oder geben Sie die ersten Buchstaben ein Sortierung aufsteigend absteigend Ergebnisse 5 10 20 40 60 80 100 Anzeige der Dokumente 60 79 von 176 Vorherige Seite Nächste Seite Autorenname Kabáth Petr Kaus Andreas Kegler Philip Keil Ralf Kickelbick Dirk Kissmann Ralf Kleimann Jens Knierim Volker Köllein Carsten König Sabine Kopf Markus Kot Yauhen Krips Melanie Krumpe Mirko Krusch Elvira Kudryavtseva Nadezhda Kühnel Florian Langhans

    Original URL path: http://e-docs.geo-leo.de/handle/11858/1489/browse?rpp=20&order=ASC&sort_by=-1&etal=-1&type=author&starts_with=K (2016-02-15)
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