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Articles 91 - 120 of 130
Full-Text Articles in Astrophysics and Astronomy
Black Holes: Myths, Legends And Truths, Shane L. Larson
Black Holes: Myths, Legends And Truths, Shane L. Larson
Public Talks
No abstract provided.
Observing Mesospheric Gravity Waves With Nasa’S Awe Mission And Correlating To Gnss Tec Maps, Jaime Aguilar Guerrero, Björn Bergsson, Sehin Mesfin, Pavel Inchin, Matthew Zettergren, Ludger Scherliess, Yucheng Zhao, Dominique Pautet
Observing Mesospheric Gravity Waves With Nasa’S Awe Mission And Correlating To Gnss Tec Maps, Jaime Aguilar Guerrero, Björn Bergsson, Sehin Mesfin, Pavel Inchin, Matthew Zettergren, Ludger Scherliess, Yucheng Zhao, Dominique Pautet
Space Dynamics Laboratory Publications
The Atmosphere Waves Experiment (AWE) is a NASA mission launched on November 9, 2023, and installed on the International Space Station (ISS). Its primary goal is to detect and characterize atmospheric gravity waves (AGWs) by measuring Earth’s mesospheric hydroxyl (OH) airglow with its key instrument, the Advanced Mesospheric Temperature Mapper (AMTM). Since its deployment, AWE has been quantifying the seasonal and regional variability of AGWs, investigating their occurrence and potential sources, and enabling the assessment of their broader impact on the atmosphere by comparing measurements at different altitudes by other instruments. AWE has collected extensive imagery and temperature data capturing …
Jewels Of The Cosmic Deep: Messier's First Guide To The Night Sky, Shane L. Larson
Jewels Of The Cosmic Deep: Messier's First Guide To The Night Sky, Shane L. Larson
Public Talks
No abstract provided.
Constraining The Black Hole Mass Spectrum With Gravitational Wave Observations – I. The Error Kernel, Danny C. Jacobs, Joseph E. Plowman, Ronald W. Hellings, Sachiko Tsuruta, Shane L. Larson
Constraining The Black Hole Mass Spectrum With Gravitational Wave Observations – I. The Error Kernel, Danny C. Jacobs, Joseph E. Plowman, Ronald W. Hellings, Sachiko Tsuruta, Shane L. Larson
All Physics Faculty Publications
Many scenarios have been proposed for the origin of the supermassive black holes (SMBHs) that are found in the centres of most galaxies. Many of these formation scenarios predict a high-redshift population of intermediate-mass black holes (IMBHs), with masses M• in the range 102≲M•≲ 105 M⊙. A powerful way to observe these IMBHs is via gravitational waves the black holes emit as they merge. The statistics of the observed black hole population should, in principle, allow us to discriminate between competing astrophysical scenarios for the origin and formation of SMBHs. However, …
Starships & The Physics Of Interstellar Travel, Shane L. Larson
Starships & The Physics Of Interstellar Travel, Shane L. Larson
Public Talks
No abstract provided.
Connections To The Cosmos: The Search For Life Beyond Earth, Shane L. Larson
Connections To The Cosmos: The Search For Life Beyond Earth, Shane L. Larson
Public Talks
No abstract provided.
Whispers From The Cosmos: Listeing To Gravity's Hidden Message, Shane L. Larson
Whispers From The Cosmos: Listeing To Gravity's Hidden Message, Shane L. Larson
Public Talks
No abstract provided.
From The Big Bang To Fossil Butte: The Cosmic Biography Of An Atom, Shane L. Larson
From The Big Bang To Fossil Butte: The Cosmic Biography Of An Atom, Shane L. Larson
Public Talks
No abstract provided.
Rayleigh-Lidar Observations Of Mesospheric Gravity Wave Activity Above Logan, Utah, Durga N. Kafle
Rayleigh-Lidar Observations Of Mesospheric Gravity Wave Activity Above Logan, Utah, Durga N. Kafle
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
A Rayleigh-scatter lidar operated from Utah State University (41.7°N, 111.8°W) for a period spanning 11 years ― 1993 through 2004. Of the 900 nights observed, data on 150 extended to 90 km or above. They were the ones used in these studies related to atmospheric gravity waves (AGWs) between 45 and 90 km. This is the first study of AGWs with an extensive data set that spans the whole mesosphere. Using the temperature and temperature gradient profiles, we produced a climatology of the Brunt-Väisälä (buoyancy) angular frequency squared, N2 (rad/s)2. The minimum and maximum values of N …
Ringworld: Travellers' Tales From Saturn, Shane L. Larson
Ringworld: Travellers' Tales From Saturn, Shane L. Larson
Public Talks
No abstract provided.
Hearing Voices In The Dark: Probing The Gravitational Wave Cosmos With Lisa, Shane L. Larson
Hearing Voices In The Dark: Probing The Gravitational Wave Cosmos With Lisa, Shane L. Larson
Colloquia and Seminars
No abstract provided.
Lisa: Seeing The Cosmos In Low Frequency Gravitational Waves, Shane L. Larson
Lisa: Seeing The Cosmos In Low Frequency Gravitational Waves, Shane L. Larson
Colloquia and Seminars
No abstract provided.
Detecting A Stochastic Gravitational-Wave Background: The Overlap Reduction Function, Lee Samuel Finn, Shane L. Larson, Joseph D. Romano
Detecting A Stochastic Gravitational-Wave Background: The Overlap Reduction Function, Lee Samuel Finn, Shane L. Larson, Joseph D. Romano
All Physics Faculty Publications
Detection of a gravitational-wave stochastic background via ground or space-based gravitational-wave detectors requires the cross correlation of the response of two or more independent detectors. The cross correlation involves a frequency-dependent factor—the so-called overlap reduction function or Hellings-Downs curve—that depends on the relative geometry of each detector pair, i.e., the detector separations and the relative orientation of their antenna patterns (beams). An incorrect formulation of this geometrical factor has appeared in the literature, leading to incorrect conclusions regarding the sensitivity of proposed detectors to a stochastic gravitational-wave background. To rectify these errors and as a reference for future work we …
The Adaptability Of Langmuir Probes To The Pico-Satellite Regime, Andrew Jay Auman
The Adaptability Of Langmuir Probes To The Pico-Satellite Regime, Andrew Jay Auman
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The purpose of this thesis is to investigate whether it is feasible to use Langmuir probes on pico-satellites flying in low Earth orbit over mid- to low-latitude geographic regions. Following chapters on the expected ionospheric conditions and an overview of Langmuir probe theory, a chapter addressing the difficulties involved with pico-satellite Langmuir probes is presented. Also, the necessary satellite-to-probe surface area requirements in order to achieve confidence in pico-satellite Langmuir probe data, for the orbital regions of interest to this thesis, are stated.
Gravity Has A Story To Tell: Lisa And The Search For Low Frequency Gravitational Waves, Shane L. Larson
Gravity Has A Story To Tell: Lisa And The Search For Low Frequency Gravitational Waves, Shane L. Larson
Colloquia and Seminars
No abstract provided.
One With The Cosmos: A Short Tour Out Your Backdoor, Shane L. Larson
One With The Cosmos: A Short Tour Out Your Backdoor, Shane L. Larson
Public Talks
No abstract provided.
Vignettes From The World Of Gravitational Wave Astrophysics, Shane L. Larson
Vignettes From The World Of Gravitational Wave Astrophysics, Shane L. Larson
Colloquia and Seminars
No abstract provided.
Songs From The Milky Way: Our Galaxy In Low Frequency Gravitational Waves, Shane L. Larson
Songs From The Milky Way: Our Galaxy In Low Frequency Gravitational Waves, Shane L. Larson
Colloquia and Seminars
No abstract provided.
Starlight In The Night: Discovering The Secret Lives Of Stars, Shane L. Larson
Starlight In The Night: Discovering The Secret Lives Of Stars, Shane L. Larson
Public Talks
No abstract provided.
Dark Side Of The Universe: Dark Matter In The Galaxy And Cosmos, Shane L. Larson
Dark Side Of The Universe: Dark Matter In The Galaxy And Cosmos, Shane L. Larson
Public Talks
No abstract provided.
From Quarks To The Cosmos, Shane L. Larson
From Quarks To The Cosmos, Shane L. Larson
Colloquia and Seminars
No abstract provided.
Whispers From The Cosmos: Seeing The Universe In Gravitational Waves, Shane L. Larson
Whispers From The Cosmos: Seeing The Universe In Gravitational Waves, Shane L. Larson
Colloquia and Seminars
No abstract provided.
Connections To The Cosmos: The Search For Life Beyond Earth, Shane L. Larson
Connections To The Cosmos: The Search For Life Beyond Earth, Shane L. Larson
Public Talks
No abstract provided.
The First Frontier: Harbor In Near Space, Shane L. Larson
The First Frontier: Harbor In Near Space, Shane L. Larson
Public Talks
No abstract provided.
The First Frontier: High Altitude Ballooning And Access To Near Space, Shane L. Larson
The First Frontier: High Altitude Ballooning And Access To Near Space, Shane L. Larson
Colloquia and Seminars
No abstract provided.
Monsters In The Cosmic Sea: Black Holes And Einstein's Astrophysical Legacy, Shane L. Larson
Monsters In The Cosmic Sea: Black Holes And Einstein's Astrophysical Legacy, Shane L. Larson
Public Talks
No abstract provided.
Oases In The Dark: Galaxies As Probes Of The Cosmos, Shane L. Larson
Oases In The Dark: Galaxies As Probes Of The Cosmos, Shane L. Larson
Public Talks
No abstract provided.
Gravitational Wave Bursts From The Galactic Massive Black Hole, Clovis Hopman, Marc Freitag, Shane L. Larson
Gravitational Wave Bursts From The Galactic Massive Black Hole, Clovis Hopman, Marc Freitag, Shane L. Larson
All Physics Faculty Publications
The Galactic massive black hole (MBH), with a mass of M•= 3.6 × 106 M⊙, is the closest known MBH, at a distance of only 8 kpc. The proximity of this MBH makes it possible to observe gravitational waves (GWs) from stars with periapse in the observational frequency window of the Laser Interferometer Space Antenna (LISA). This is possible even if the orbit of the star is very eccentric, so that the orbital frequency is many orders of magnitude below the LISA frequency window, as suggested by Rubbo, Holley-Bockelmann & Finn (2006). …
Semi-Relativistic Approximation To Gravitational Radiation From Encounters With Non-Spinning Black Holes, Jonathan R. Gair, Daniel J. Kennefick, Shane L. Larson
Semi-Relativistic Approximation To Gravitational Radiation From Encounters With Non-Spinning Black Holes, Jonathan R. Gair, Daniel J. Kennefick, Shane L. Larson
All Physics Faculty Publications
The capture of compact bodies by black holes in galactic nuclei is an important prospective source for low frequency gravitational wave detectors, such as the planned Laser Interferometer Space Antenna. This paper calculates, using a semirelativistic approximation, the total energy and angular momentum lost to gravitational radiation by compact bodies on very high eccentricity orbits passing close to a supermassive, nonspinning black hole; these quantities determine the characteristics of the orbital evolution necessary to estimate the capture rate. The semirelativistic approximation improves upon treatments which use orbits at Newtonian order and quadrupolar radiation emission, and matches well onto accurate Teukolsky …
Lisa Time-Delay Interferometry Zero-Signal Solution: Geometrical Properties, Massimo Tinto, Shane L. Larson
Lisa Time-Delay Interferometry Zero-Signal Solution: Geometrical Properties, Massimo Tinto, Shane L. Larson
All Physics Faculty Publications
Time-delay interferometry (TDI) is the data processing technique needed for generating interferometric combinations of data measured by the multiple Doppler readouts available onboard the three Laser Interferometer Space Antenna (LISA) spacecraft. Within the space of all possible interferometric combinations TDI can generate, we have derived a specific combination that has zero response to the gravitational wave signal, and called it the zero-signal solution (ZSS). This is a two-parameter family of linear combinations of the generators of the TDI space, and its response to a gravitational wave becomes null when these two parameters coincide with the values of the angles of …