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 63 for “"Hubble Space Telescope"”.
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Astronomers and the Hubble space telescope: an historical analysis
In this thesis I describe a period in the Hubble Space Telescope's history during which a relatively small number of astronomers worked to encourage their colleagues to support the telescope project. I analyze astronomers' behavior in terms of the various problems which they faced. I argue that …
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Stellar occultation studies of Saturn's rings with the Hubble Space Telescope
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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Spectral measurements of hydrogen Lyman-alpha in the atmospheres of Venus and Jupiter using a sounding rocket and the Hubble Space Telescope
… formation. The measurement will be made using a telescope with a spectrograph launched on a sounding rocket scheduled for launch in early 2012 from White Sands Missile Range. On Jupiter, the Lyman-alpha emission was observed to better characterize an anomalously bright region near the equator …
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Considerations for space and Naval aircraft applications of ferroelectric memory
… memory and discuss considerations for possible space and Naval aviation applications. Ferroelectric memory's characteristics and basic mechanism are discussed. A broad spectrum of existing computer memory types are presented for comparison. The memory requirements of Space Shuttle, Landsat, …
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Made-to-measure Modelling of Nuclear Star Clusters
… with F814W band photometric data from the Hubble space telescope and the χ2-made-to-measure code NMAGIC. We find a best fitting central black hole mass of 5 x 105 M⊙ . Our models also have a negative βz, as in earlier models. We conclude that although the disc component of NGC 4244’s …
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Imaging the invisible : constraining dark matter distributions in galaxy clusters using strong gravitational lensing
… to the giant lensed arcs observed by the Hubble Space Telescope around Abell 1689 and other similar clusters, and using an NFW analytic density profile to model the overall dark matter distribution, an upper limit is set on the scale of allowed deviations from a smooth NFW dark matter …
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Optical detection and analysis of Pictor A's jet
New images from the Hubble Space Telescope of the FRII radio galaxy Pictor A reveal a number of jet knot candidates which coincide with previously detected radio and x-ray knots. Previous observations in x-ray and radio bands show the entire jet to be 1.90 long, with interesting variability, but an …
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The non-sphericity of Triton's atmosphere as evidenced by stellar occultations
… set was reanalyzed. Recent new data from the Hubble Space Telescope Fine Guidance System allowed the separation and position angle of the Tr148 double star to be independently incorporated into the occultation analysis rather than being freely fit during the occultation reduction. The …
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Starbursts in the UV bright interacting galaxies NGC 3395 and NGC 3396
… the interacting galaxies, NGC 3395/6, using the Space Telescope Imaging Spectrograph (STIS) on Hubble Space Telescope (HST). The images show many isolated sources of ultraviolet emission which are young star forming regions with ages ≤8 x 107 years. Reddening of the star forming knots ranges …
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Gravitationally lensed image simulations for the study of the substructure in galaxy clusters
… These images use a catalog of galaxies from the Hubble Space Telescope data taken as part of the Cosmos Evolution Survey (COSMOS). The background galaxies are then lensed by a 1015M galaxy cluster set at a redshift of z = 0.4. Noise and a point spread function (PSF) can also be added to the …
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Quantitative analysis of 3-arm spiral galaxies
… Survey (SDSS), supplemented with high-resolution Hubble Space Telescope (HST) observations. This allowed us to study the morphological demographics of our sample, for both the internal structure and arm symmetry. The HST images provided special insight into spiral structure and star formation for …
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Accreting Compact Objects in Technicolor: Multiwavelength Characterization of High Mass X-ray Binaries in the Local Group
… of M33. In M31, I used observations from the Hubble Space Telescope (HST), the Chandra X-ray Observatory, and the Nuclear Spectroscopic Telescope Array (NuSTAR) to characterize the population of HMXBs in that galaxy and measure the overall HMXB production rate. In the SMC, I used NuSTAR …
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High-resolution multi-wavelength study of the jet in 3C273
… with the Very Large Array at radio and the Hubble Space Telescope at infrared, optical and ultraviolet wavelengths. These observations reveal a flattening of the high-frequency spectrum of the jet, a surprising feature which cannot be accounted for by any single-population synchrotron model. …
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Quasar continuum fitting and silicon absorption on the low redshift intergalactic medium
… from 328 spectra of 204 QSOs taken from the Hubble Space Telescope archive. We develop a new, reproducible method of quasar continuum fitting, designed to quickly identify absorption lines and measure the relative line strength (a proxy for equivalent width). Our method, which fails to …
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Money for the big eyes
… its eyes on the heavens, and the invention of telescopes has only increased its scrutiny. As astronomers strive to see the universe with increasing clarity, telescopes have been getting bigger, better, and more expensive. The astronomy community is currently preparing for the next generation of …
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Constraints on early-type galaxy structure from spectroscopically selected gravitational lenses
… selection, ground-based spectroscopic follow-up, Hubble Space Telescope imaging, data analysis, and results on the radial density profile of the lens galaxies. The lens candidates are selected from within the spectroscopic database of the Sloan Digital Sky Survey (SDSS) based on the appearance of …
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Weak lensing flexion as a probe of galaxy cluster substructure
… apply the AIM method for flexion measurement to Hubble Space Telescope observations of Abell 1689, and detect mass structure in that cluster using only flexion measured with the AIM method.
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Finding fossil galaxy system progenitors using strong gravitational lensing
… to our original CASSOWARY data using the Hubble Space Telescope allowed us to disentangle complex merging environments at the centers of these eight progenitors, which further solidified the notion that progenitors are indeed transitioning toward fossil systems.
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A decision-making framework to determine the value of on-orbit servicing compared to replacement of space telescopes
The Hubble Space Telescope has demonstrated that on-orbit servicing can provide significant benefits for scientific space programs. Specifically, servicing missions can replace failed components to keep spacecraft operational, and can upgrade onboard components to improve spacecraft performance. …
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Spatially resolved spectroscopy of faint star-forming galaxies & their environments in the high redshift universe
… resolution of the G800L grism on board the Hubble Space Telescope. Observations of two Einstein Ring galaxies at z ∼ 2−3 are also presented, with the spectrum of one of these displaying evidence for large scale gaseous outflows. Studies such as these are crucial for understanding the physics …
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