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.
Results
Showing 1 to 13 of 13 for “"Galactic Bulge"”.
-
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 …
-
Photometric variability of X-ray sources in the galactic bulge
The Chandra Galactic Bulge Survey (GBS) undertakes to find and classify X-ray sources in the Galactic Bulge. Of these X-ray sources, there is likely a significant minority which are Low Mass X-ray Binaries: systems containing either a neutron star or black hole that is accreting matter from a roughly …
-
A HI search for galaxies hidden by the Galactic bulge
… (HI) galaxy search for galaxies hidden by the Galactic Bulge is presented. The HI Parkes deep HI Zone of Avoidance (ZOA) survey has been extended towards the higher latitudes in the Galactic Bulge region. The surveyed region covers 332° ≤ l ≤ 36° for the region 5° ≤ │b│ ≤ 10° and 352° ≤ l ≤ 24° …
-
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 …
-
The red clump stars as a distance indicator : review and application
… was primarily to determine the distance to the Galactic Centre using a new technique pioneered by Paczynski and Stanek (1998) that uses the red clump stars as a standard candle. This was made possible by the large number of stars simultaneously observed by the OGLE microlensing project which …
-
Gravitational Lensing in the Solar Neighbourhood and Towards the Milky Way Bulge
… events towards highly-extinct regions of the Galactic bulge. In both cases, I develop a Bayesian methodology to characterize the microlensing signals. In Chapter 1, I review the history of finding microlensing events both by predicting stellar alignments and by monitoring millions of stars. I …
-
Galactic Structure with Giant Stars
… Miras, as chronometers to study the evolution of Galactic structure over stellar age. I study red giants in the Magellanic Clouds, assign them photometric metallicities and map large scale trends both in their chemistry and proper motions. In Chapter 1 I provide an overview of the historical …
-
A systematic periodicity and time-variable modulation search in RXTE ASM data : methods, findings, and implications for astrophysical X-ray sources
… in the modulation of the X-ray flux from the Galactic bulge low-mass X-ray binary GX 9+9 and the recent spin-down event of the pulsar in the high-mass X-ray binary X0114+650, are reported. These searches employed new methods of periodicity detection that employed an algorithm to reduce the …
-
Gamma-ray emission from Galactic millisecond pulsars: Implications for dark matter indirect detection
… of unresolved millisecond pulsars (MSPs) in the Galactic center remains a possible source of the excess. Furthermore, recent analyses have shown that the excess prefers the spatial morphology of the stellar bulge distribution in the Galactic center, supporting a MSP origin. The new discovery …
-
Iras oxygen- and carbon-rich miras close to the galactic plane
… to be Mira Variables and that lie close to the galactic plane: -7.0 3 < b < + 1° and 282.°5 < l < 285.°5. Over 1090 JHKL photometry modules were obtained for the sources. From the photometry the sample was shown to comprise 85 Miras, 12 of which had published periods. New periods were determined …
-
Magnetospheres of neutron stars accreting from disks
… disks. It may also be relevant to the luminous galactic bulge X-ray sources that display quasi-periodic oscillations in intensity. These QPO sources are thought by some to be weakly magnetic neutron stars accreting from disks. In constructing these magnetospheric models, I assume that the …
-
Capturing transients: an application of biostatistics to astronomy
… of Dwarf Nova located towards and in the Galactic Bulge identified from the OGLE-II, -III, and -IV phases. This approach combines closed and open population practices that allows new individuals identified between the survey phases to be added to the study sample for dynamical estimation. …
-
Examining the growth and evolution of magnetic fields in clusters of galaxies: a numerical perspective
… modify the evolution of bubbles driven by active galactic nuclei. However, we currently do not fully understand the origin and evolution of these fields throughout cosmic time. Furthermore, we do not have a general understanding of the relationship between magnetic field strength and topology and …