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Articles 1 - 6 of 6
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Galactic Bulge Feedback And Its Impact On Galaxy Evolution, Shikui Tang
Galactic Bulge Feedback And Its Impact On Galaxy Evolution, Shikui Tang
Open Access Dissertations
Galactic bulges of early-type spirals and elliptical galaxies comprise primarily old stars, which account for more than half of the total stellar mass in the local Universe. These stars collectively generate a long-lasting feedback via stellar mass loss and Type Ia supernovae. According to the empirical stellar mass loss and supernova rates, the stellar ejecta can be heated to more than 107 K, forming a very hot, diffuse, and ironrich interstellar medium. Conventionally a strong galactic wind is expected, especially in low- and intermediate-mass early-type galaxies which have a relatively shallow potential well. X-ray observations, however, have revealed that both …
Galaxy Evolution At High-Redshift: Millimeter-Wavelength Surveys With The Aztec Camera, Kimberly S Scott
Galaxy Evolution At High-Redshift: Millimeter-Wavelength Surveys With The Aztec Camera, Kimberly S Scott
Doctoral Dissertations 1896 - February 2014
Galaxies detected by their thermal dust emission at submillimeter (submm) and millimeter (mm) wavelengths comprise a population of massive, intensely star-forming systems in the early Universe. These "submm/mm-galaxies", or SMGs, likely represent an important phase in the assembly and/or evolution of massive galaxies and are thought to be the progenitors of massive elliptical galaxies. While their projected number density as a function of source brightness provides key constraints on models of galaxy evolution, SMG surveys carried out over the past twelve years with the first generation of submm/mm-wavelength cameras have not imaged a large enough area to sufficient depths to …
A Frequency Selective Bolometer Camera For Measuring Millimeter Spectral Energy Distributions, Daniel William Logan
A Frequency Selective Bolometer Camera For Measuring Millimeter Spectral Energy Distributions, Daniel William Logan
Open Access Dissertations
Bolometers are the most sensitive detectors for measuring millimeter and submillimeter wavelength astrophysical signals. Cameras comprised of arrays of bolometers have already made significant contributions to the field of astronomy. A challenge for bolometer cameras is obtaining observations at multiple wavelengths. Traditionally, observing in multiple bands requires a partial disassembly of the instrument to replace bandpass filters, a task which prevents immediate spectral interrogation of a source. More complex cameras have been constructed to observe in several bands using beam splitters and dichroic filters, but the added complexity leads to physically larger instruments with reduced efficiencies. The SPEctral Energy Distribution …
The Aztec Millimeter-Wave Camera: Design, Integration, Performance, And The Characterization Of The (Sub-)Millimeter Galaxy Population, Jason Edward Austermann
The Aztec Millimeter-Wave Camera: Design, Integration, Performance, And The Characterization Of The (Sub-)Millimeter Galaxy Population, Jason Edward Austermann
Open Access Dissertations
One of the primary drivers in the development of large format millimeter detector arrays is the study of sub-millimeter galaxies (SMGs) - a population of very luminous high-redshift dust-obscured starbursts that are widely believed to be the dominant contributor to the Far-Infrared Background (FIB). The characterization of such a population requires the ability to map large patches of the (sub-)millimeter sky to high sensitivity within a feasible amount of time. I present this dissertation on the design, integration, and characterization of the 144-pixel AzTEC millimeter-wave camera and its application to the study of the sub-millimeter galaxy population. In particular, I …
The Role Of Stellar Feedback In Galaxy Evolution, Li Zhiyuan
The Role Of Stellar Feedback In Galaxy Evolution, Li Zhiyuan
Open Access Dissertations
Aiming at understanding the role of stellar feedback in galaxy evolution, I present a study of the hot interstellar medium in several representative galaxies, based primarily on X-ray observations as well as theoretical modelling. I find that, in the massive disk galaxies NGC2613 and M104, the observed amount of hot gas is much less than that predicted by current galaxy formation models. Such a discrepancy suggests a lack of appropriate treatments of stellar/AGN feedback in these models. I also find that stellar feedback, primarily in the form of mass loss from evolved stars and energy released from supernovae, and presumably …
The Role Of Stellar Feedback In Galaxy Evolution, Zhiyuan Li
The Role Of Stellar Feedback In Galaxy Evolution, Zhiyuan Li
Doctoral Dissertations 1896 - February 2014
Aiming at understanding the role of stellar feedback in galaxy evolution, I present a study of the hot interstellar medium in several representative galaxies, based primarily on X-ray observations as well as theoretical modelling.
I find that, in the massive disk galaxies NGC2613 and M104, the observed amount of hot gas is much less than that predicted by current galaxy formation models. Such a discrepancy suggests a lack of appropriate treatments of stellar/AGN feedback in these models.
I also find that stellar feedback, primarily in the form of mass loss from evolved stars and energy released from supernovae, and presumably …