Browsing by Classification (DDC) "ddc:520"
Now showing items 1-20 of 255
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A 3-mm Imaging Line Survey of the Central Molecular Zones of M 82 and IC 342
Chidiac, Céline (2020-07-07)The central molecular zones of two nearby galaxies M 82 and IC 342 are among the most prominent extragalactic molecular sources in the northern hemisphere. While M 82 is a relatively small late type starburst galaxy, IC ... -
3D-Stadtmodellierung auf heterogenen Ausgangsmodellen mittels evolutionärer Algorithmen
Weitzig, Björn (2007)Die vorliegende Arbeit beschreibt ein neuartiges Verfahrens zur flexiblen und effizienten 3D-Stadtmodellierung im Kontext der Verfügbarmachung von 3D-Stadtmodellen. Ausgangspunkt ist die Heterogenität existierender und ... -
A LAsMA Survey of the Milky Way: Effects of Feedback on Molecular Clouds
Mazumdar, Parichay (2022-09-02)The advent of radio and (sub) millimetre astronomy has opened the world of molecular clouds (MCs) to astronomers' wonder. At the turn of the 21st century, MC surveys have helped us better understand them. How MCs form, ... -
Analyse der Konfiguration bei der Approximation ungleichmäßig abgetasteter Oberflächen auf Basis von Nivellements und terrestrischen Laserscans
Holst, Christoph (2015)Seit einigen Jahren unterliegt der Bereich der Ingenieurgeodäsie einem starken Wandel, da sich diese Disziplin generell den stetig weiterentwickelnden, anwendungsbezogenen Problemstellungen widmet. Unter diesen Aspekten ... -
Analysis and mitigation of site-dependent effects in static and kinematic GNSS applications
Zimmermann, Florian (2020)Satellitensignale unterliegen auf ihrem Weg von der Satelliten- zur Empfangsantenne einer Vielzahl an Einflüssen die zu Abweichungen führen. Heutzutage stellen in vielen Anwendungsbereichen insbesondere die stationsspezifischen ... -
The APEX southern sky survey of high mass star forming regions
Dedes, Carolin (2009-03-30)During my dissertation work, I studied the early stages of massive star formation in the southern hemisphere, using sub-mm line and continuum data. A sample of 47 sources, chosen according to IRAS color selection criteria, ... -
The APEX submillimeter imaging survey of distant galaxies in the COSMOS field
Navarrete Avendaño, Felipe Pedro (2015-11-16)Submillimeter galaxies (SMGs) are far-infrared luminous, vigorously star forming galaxies in the early universe. They are major contributors to the extragalactic far-infrared background emission, and they trace the most ... -
Application of photometric redshifts on the correlation properties of galaxies and matter
Hildebrandt, Hendrik Jürgen (2007)In the past years cosmology, the science of the universe as a whole, has seen tremendous progress. The Lambda-Cold-Dark-Matter scenario is widely accepted as the standard model of cosmology describing the evolution of the ... -
Asymmetries of Radio Galaxies
Sohn, Bong Won (2003)In this work, we have studied the asymmetries of radio galaxies which are known to be related to the jet-asymmetry. They are the depolarization asymmetry and the spectral index asymmetry.
The first part of the thesis ... -
Atmospheric refraction and turbulence in VLBI data analysis
Halsig, Sebastian (2018)The progress in further improving the quality of results derived by space-geodetic techniques observing in the radio frequency domain, such as Very Long Baseline Interferometry (VLBI) or Global Navigation Satellite Systems ... -
Automated Source Extraction for the Next Generation of Neutral Hydrogen Surveys
Flöer, Lars (2015-12-23)This thesis is a first step to develop the necessary tools to automatically extract and parameterize sources from future HI surveys with ASKAP, WSRT/Apertif, and SKA.
The current approach to large-scale HI surveys, ... -
Beobachtungen der unmittelbaren Umgebung von Supermassiven Schwarzen Löochern Millimeter-VLBI von AGN
Pagels, Anke (2006)Mittels globaler Radiointerferometrie (Very-Long Baseline Interferometry: VLBI) ist es möglich, die unmittelbare Umgebung von Supermassiven Schwarzen Löchern zu beobachten. Die hohe Beobachtungsfrequenz von 86 GHz erlaubt ... -
Binary star population synthesis: Progenitors of gravitational wave driven mergers
Kruckow, Matthias U. (2018-06-13)The vast majority of all massive stars are born in binaries. The binarity of a star may influence its life drastically via a large variety of interactions with its companion star. Several astrophysical events, like the ... -
Challenges of theoretical and numerical structure formation in a ΛCDM universe
Roth, Nina (2015-06-22)Systematic surveys of the extra-galactic sky have revealed the existence of large-scale structures in the Universe: the galaxy distribution is organized in a complex network of filaments surrounding underdense regions and ... -
The cloudy HI halo of the Milky Way
Dedes, Leonidas (2008)Based on the analysis of the Milky Way soft X-ray background and all sky 21-cm line surveys models show that the gaseous Galactic Halo has two components, one of hot plasma with log[T(K)]=6 and a neutral component. If ... -
Clumpy Dust Tori in Active Galactic Nuclei
Hönig, Sebastian Florian (2008)Active Galactic Nuclei (AGN) are amongst the most luminous objects in the universe. The source of their activity is accretion onto a supermassive black hole in the center of the galactic nucleus. The various phenomena ... -
Combined Weak Lensing and X-Ray Search for Galaxy Clusters and the Filaments Connecting Them
Dietrich, Jörg Peter (2006)The work presented here has four main parts.
(1) A newly developed, almost fully automated data reduction pipeline for optical single- and multi-chip CCD cameras is described. Its image products are compared to those ... -
Complex organic chemistry in high-mass star forming regions
Bonfand-Caldeira, Mélisse (2019-10-22)The quest for interstellar complex organic molecules (COMs) lies at the heart of astrochemistry. One basic motivation is to figure out how the rich inventory of COMs found in meteorites and comets is connected to interstellar ... -
Comprehensive population synthesis predictions for massive binary stars in the Small Magellanic Cloud
Xu, Xiao-Tian (2024-01-30)The past and ongoing gravitational wave detections have fostered a wide interest in understanding the formation of binary black holes (BBHs). Several formation scenarios have been proposed, including the evolution of ... -
Convex optimization for inequality constrained adjustment problems
Roese-Koerner, Lutz Rolf (2015)Whenever a certain function shall be minimized (e.g., a sum of squared residuals) or maximized (e.g., profit) optimization methods are applied. If in addition prior knowledge about some of the parameters can be expressed ...