E-Dissertationen: Suche
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The Dynamical Ejections of Massive Stars from Young Star Clusters
(2017-07-21)
Massive stars form in star clusters or OB associations which may be expanded clusters. Such stars can be expelled with a high velocity from their birth cluster through a strong close encounter with other cluster members. ...
Probing the Magnetized Medium of Galaxies and AGNs using Wideband Radio Polarimetry
(2019-08-13)
I performed an observational study of diffuse linearly polarized synchrotron emission of a nearby galaxy and of extragalactic background sources in order to study cosmic magnetism. The speciality of my work is given by the ......
Complex organic chemistry in high-mass star forming regions
(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 ...
Cosmology with the galaxy bispectrum
(2019-10-29)
The last decades witnessed huge progress in understanding the large-scale structure of the Universe. While homogeneous and isotropic on the largest scales, the matter and galaxy distributions display complex patterns on ...
Radio Continuum of Galaxies with H2O-Megamaser-Disks
(2019-11-08)
Galaxies with H2O-megamaser-disks are low luminosity active galaxies where 22GHz H2O-maser emission is detected in their accretion disk surrounding the central supermassive black hole (SMBH). Furthermore, ...
The Physics and Chemistry of Oxygen-rich Circumstellar Envelopes as Traced by Simple Molecules
(2018-04-17)
The physics and chemistry of the circumstellar envelopes (CSEs) of evolved stars are not fully understood despite decades of research. This thesis addresses two issues in the study of the CSEs of oxygen-rich (O-rich) evolved ......
The redshift distribution and dust properties of dusty star-forming galaxies at high redshift
(2018-03-27)
Millimeter (mm) and submillimeter (submm) continuum observations brought about a radical shift with the discovery that luminous, dusty galaxies were a thousand times more abundant in the early Universe than they are at ...
Searching for Pulsars in Unassociated Fermi-LAT sources
(2018-05-22)
Pulsars have always been under the γ-ray spotlight since the birth of γ-ray astronomy. They were the first sources that were firmly established as γ-ray sources in the 70s. Since then, pulsars have been the prime suspect ...
The large-scale structure of the Universe; environmental effects and relativistic corrections
(2018-12-13)
Over the cosmic age gravity has formed the structures in the universe where galaxies are part of. We study here the effect of the environmet on the formation of dark-matter haloes and find that the growth can be quenched. ...
Ionized and Photodissociation Regions toward a New Sample of Massive Star-forming Clumps
(2018-07-16)
HII regions are an excellent indicator of high-mass star-forming regions and ongoing star formation in galaxies. Powerful outflows from O/B stars in their early stages and, during their whole life, intense UV radiation and ...