Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"Galactic Center"”.
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Gas feeding of the galactic center region
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1993.
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Massive stars in the Galactic Center Quintuplet cluster
… thesis describes the observations of the Galactic center Quintuplet cluster, the spectral analysis of the cluster Wolf-Rayet stars of the nitrogen sequence to determine their fundamental stellar parameters, and discusses the obtained results in a general context. The Quintuplet cluster was …
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Probing Galactic Magnetism near the Galactic Center with THOR-GC
The Galactic magnetic field (GMF) permeates the entire Milky Way and plays an important role in the dynamics of the Galaxy. An understanding of the GMF is required to create a comprehensive model of the Galaxy. As the GMF does not radiate, it must be observed indirectly by studying the polarization …
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Neutral gas and the magnetic field in the Galactic Center
There is substantial evidence that the Galactic Center harbors some of the strongest observable magnetic fields in the Galaxy, which are expected to have a major role in the astrophysical processes there. In this thesis, I present results from an experiment to measure the line-of-sight component of …
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Luminosity functions consistent with a pulsar-dominated Galactic Center Excess
… rays emanating from the region surrounding the center of the Milky Way (the “Galactic Center excess”). We examine several simple parameterizations of possible luminosity functions for this population, as well as several benchmark luminosity functions proposed in the literature, and compare the …
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Heavy neutrino balls and the supermassive dark object at the Galactic center
… compact dark object near Sgr A* at the Galactic center could be an extended object rather than a black hole. In fact these two scenarios can be distinguished by tracking the orbit of one of the fast moving stars near the Galactic center. VVe finally calculate the emission spectrum of the …
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Uncovering the Structure of the Galactic Bulge Using Kinematic Data from the JASMINE Near-Infrared Astrometric Satellite
The Galactic Center (GC) is the region with the most extreme stellar densities, a strong gravitational field, and the most prolific star formation region in the Milky Way. Furthermore, the Milky Way is the only galaxy that we can resolve individual structure such as Nuclear Stellar Disk (NSD) and …
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Gamma-ray emission from Galactic millisecond pulsars: Implications for dark matter indirect detection
… has observed a gamma-ray excess toward the center of the Galaxy at ~ GeV energies. The spectrum and intensity of the excess are consistent with the annihilation of dark matter with a mass of ~100 GeV and a velocity-averaged cross section of ~ 1e-26 cubic centimeter per second. In the …
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Mass Functions and Mass Segregation in Young Starburst Clusters
The Milky Way starburst clusters Arches in the Galactic Center region and NGC 3603 in the Carina spiral arm are studied with the aim to gain deeper insight into the stellar mass distribution in starburst clusters. The dense stellar population in both clusters is resolved in unprecedented detail …
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Gravitational lensing
… the main results of massive dark objects at galactic center as Schwarzschild black hole lenses. We also demonstrate the gravitational lensing analysis in f(R) gravity theories.
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Star Clusters and Dark Matter as Probes of the Spacetime Geometry of Massive Black Holes
… very close to the supermassive black hole at the center of our galaxy, known as Sgr A*, could provide tests of the so-called no-hair theorem of general relativity through the measurement of precessions of their orbital planes. By considering how a distribution of stars and stellar mass black holes …
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Kinematics and stellar populations of the galactic bulge.
… metallicities for the stellar population of the Galactic bulge, several hundred spectra of giants have been obtained. These include three bulge fields at projected distances from the Galactic center of 1.5, 1.7 and 1.7 kpc, and 33 globular and open clusters. We measure metallicities based on a …
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Kinematic and Abundance Gradients in the Galactic Disk
… and BV photometry of 364 G and K stars in the galactic center and anticenter directions have been obtained for the purpose of investigating the gradients of abundance and velocity dispersion in the galactic disk. The abundance gradient found for these stars is d (Fe/H) /dR = $-$0.017 $\pm$.007 …
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Sampling the Radio Transient Universe: Studies of Pulsars and the Search for Extraterrestrial Intelligence
… bursts, to flare stars, pulsars, and bursts of Galactic and potentially even cosmological origin. Among these, perhaps the most widely studied radio transients, pulsars are fast-spinning neutron stars that emit radio beams from their magnetic poles. In spite of over 40 years of research on …
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Applications of X-ray Instrumentation for Dark Matter Searches with Cosmic-ray Antiparticles
… and astrophysics. Indirect dark matter detection centers on cosmic-ray signatures of possible dark matter annihilation or decay to Standard Model particles in the Galaxy. Relative to terrestrial experiments, such indirect dark matter searches benefit from the large size of the Galaxy and can probe …
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Illuminating the Nature of Dark Matter through Observation, Simulation and Machine Learning
… techniques to tackle the problem of the Galactic Center 1-ray Excess.
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Constraining the Initial Conditions and Final Outcomes of Accretion Processes around Young Stars and Supermassive Black Holes
… and around the supermassive black hole at the galactic center. I begin by describing adaptive optics-fed infrared spectroscopic studies of nascent and newborn binary systems. Binary star formation is a significant mode of star formation that could be responsible for the production of a majority …
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Heart of darkness
… Sagittarius A* (the compact dark object at the center of our galaxy) may be a cosmic mafia manipulating the galaxies that house them, possibly even controlling galaxy growth. If this suspicion turns out to be true, black holes may have had more influence on cosmic structure than any other …
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