Дисертації з теми "High energy astrophysics and galactic cosmic rays"
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Gabici, Stefano. "Gamma ray astronomy and the origin of galactic cosmic rays." Habilitation à diriger des recherches, Université Paris-Diderot - Paris VII, 2011. http://tel.archives-ouvertes.fr/tel-00719791.
Повний текст джерелаSzabo, Anthony Paul. "High energy emissions for astrophysical objects." Title page, contents and abstract only, 1992. http://web4.library.adelaide.edu.au/theses/09PH/09phs996.pdf.
Повний текст джерелаBrandt, Theresa J. "On High Energy Cosmic Rays from the CREAM Instrument." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1259540765.
Повний текст джерелаSutherland, Michael. "A Method for Establishing Constraints on Galactic Magnetic Field Models Using Ultra High Energy Cosmic Rays and Results from the Data of the Pierre Auger Observatory." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1274798328.
Повний текст джерелаGrégoire, Timothée. "Search for high energy neutrinos from the Galactic plane with the ANTARES neutrino telescope." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC129/document.
Повний текст джерелаTwo analyses are detailed in this thesis. A first analysis exploit the data of the ANTARES neutrino telescope to probe the presence of a Galactic diffuse neutrino flux. This analysis is based on a recent model of cosmic ray propagation in the Galaxy, the KRAγ model. This model predict a neutrino flux particularly high and close to the sensitivity of the current neutrino telescopes. Two versions of this model exist corresponding to different cuts in the cosmic ray energy, one at 5 PeV/nucleon and an other one at 50 PeV/nucleon. A method of maximization of a likelihood function is used in order to account for the model characteristics in energy and space. The analysis has also been combined with the data of the IceCube experiment in order to exploit all the available data. Limits have been put on this model rejecting the version of the model with the 50 PeV cut and limiting the version with the 5 PeV cut to less than 1.2 times the predicted flux.A second analysis of gravitational wave signal follow-up by the ANTARES neutrino telescope is also presented in this work. The GW170817 gravitational wave signal results from the coalescence of a binary neutron star system. This second analysis aims at probing the presence of a neutrino flux coming from this event looking for neutrino events correlated in space and time. I took part to this analysis by adding the shower-like event sample. No event has been detected in correlation, limits have been put on the expected neutrino flux
Taylor, Andrew Martin. "The propagation of ultra high energy cosmic rays." Thesis, University of Oxford, 2007. http://ora.ox.ac.uk/objects/uuid:63572ebe-fb32-41b6-8b91-a7294db135a6.
Повний текст джерелаChadwick, Mary Paula. "Very high energy cosmic gamma rays from radio and X-ray pulsars." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6720/.
Повний текст джерелаLee, Anthony A. "Application of Monte Carlo methods to some problems in high energy astrophysics /." Title page, contents and abstract only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09phl4768.pdf.
Повний текст джерелаMacRae, John Hamish Kenneth. "The detection of very high energy cosmic gamma rays using the atmospheric Cerenkov technique." Thesis, Durham University, 1985. http://etheses.dur.ac.uk/7854/.
Повний текст джерелаMorris, Chad Michael. "Detection Techniques of Radio Emission from Ultra High Energy Cosmic Rays." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1254506832.
Повний текст джерелаBurton, Ross E. "Upper Limits on the Ultra-High Energy Cosmic Ray Flux from Unresolved Sources." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1323452264.
Повний текст джерелаLaHurd, Danielle V. "Searching for Quark Gluon Plasma Signatures in Ultra High Energy Cosmic Rays." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1479298851843212.
Повний текст джерелаRodrigues, Xavier. "Blazars as Sources of Neutrinos and Ultra-high-energy Cosmic Rays." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20610.
Повний текст джерелаThe origin of ultra-high-energy cosmic rays (UHECRs) is still unclear. Neutrino telescopes like IceCube have observed a flux of high-energy cosmic neutrinos, expected to originate in cosmic ray (CR) interactions. However, their arrival directions do not statistically correlate with the positions of known high-energy astrophysical sources. In this thesis we explore blazars, a class of active galaxies, as potential UHECR accelerators. Motivated by evidence that a fraction of the UHECRs are heavier than protons, we model the interactions of CR nuclei with the photon fields present in blazars, in order to estimate the emitted neutrino and UHECR spectrum. We conclude that in dim blazars, accelerated CRs do not interact efficiently due to the low photon density, but instead escape the source unscathed. In bright blazars, photo-hadronic interactions are more efficient, leading to abundant production of neutrinos and lighter nuclei. We use this model to quantify the neutrino emission from the entire cosmological blazar population. We conclude that low-luminosity blazars currently unobserved but expected theoretically, can explain the entire IceCube flux at the highest energies. We then focus on blazar TXS 0506+056, from whose direction a neutrino was recently detected during an electromagnetic flaring state. We test the hypothesis that a signal of 13+/-5 neutrinos observed by IceCube from the same direction in 2014-15 may have originated in the same source. Given the constraints from multi-wavelength observations, this model can explain at most 5 neutrino events. Finally, we study the remnant of the first neutron star merger ever observed, object GW170817. We model the particle interactions in the source and show that multi-wavelength observations can provide a constraint on the magnetic field strength. We estimate that this source may be an efficient CR emitter, which shows the importance of future multi-messenger observations to better constrain this source type.
Peron, Giada [Verfasser], and Felix [Akademischer Betreuer] Aharonian. "Probing the Spatial and Spectral Distribution of Galactic Cosmic Rays with High-Energy Gamma-Rays / Giada Peron ; Betreuer: Felix Aharonian." Heidelberg : Universitätsbibliothek Heidelberg, 2021. http://d-nb.info/1225938627/34.
Повний текст джерелаPinzke, Anders. "Gamma-Ray Emission from Galaxy Clusters : DARK MATTER AND COSMIC-RAYS." Doctoral thesis, Stockholms universitet, Fysikum, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-42453.
Повний текст джерелаAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Accepted.
Griffith, Nathan E. "Microwave Detection of Cosmic Rays and Multi-Messenger Analysis of the Parameters of Ultra-High Energy Astrophysical Sources." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429799044.
Повний текст джерелаMorejon, Leonel. "New Interaction Models of Ultra-high-energy Cosmic Rays from a Nuclear Physics Approach." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22585.
Повний текст джерелаThe origin of the ultra-high-energy cosmic rays (UHECRs) is still unknown. Photonuclear interactions of cosmic rays are key to understanding this problem in a multimessenger context. Nuclear physics insights are crucial in building accurate models to interpret the data that indicates UHECR can be heavier than protons. This thesis presents models that improve three aspects of high-energy astronuclear physics modelling: photomeson production by cosmic-ray nuclei heavier than protons, gamma-ray emission from unstable nuclei created by the photodisintegration of cosmic rays, and the simulation of extragalactic propagation of nuclei heavier than iron (so-called superheavy isotopes). The photomeson model is the first in the literature to go beyond the simple principle of nucleon superposition. It provides a more accurate description of the inelastic cross sections, and the emitted spectrum of secondary particles, including isotopes and pions which lead to photons and neutrinos.The model’s impact is shown in simulations of gamma-ray bursts and tidal disruption events, and it affects significantly the high-energy neutrino emission, the chemical composition and the spectrum of the emitted UHECRs. The second model describes photoproduction from de-excitations and decay of unstable nuclei, which are expected to be produced in photo-disintegration of cosmic rays interacting with astrophysical photons. Its impact is illustrated in the photo-emission from the core of the Centaurus A and compared to similar works with which is in disagreement. This supports the need for sufficiently accurate models. Lastly, the photodisintegration of UHECR superheavy nuclei is discussed. An interaction table is produced with cross sections obtained from TALYS and the interaction rates computed in the context of extragalactic propagation. Superheavy nuclei propagate further than lighter nuclei in certain energy ranges. The models developed are publicly available as open-source software.
Stapleton, James C. "Ultra-High Energy Cosmic Rays: Composition, Early Air Shower Interactions, and Xmax Skewness." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1431044195.
Повний текст джерелаQuinn, Sean P. "Arrival Direction Probabilities of Ultra High Energy Cosmic Rays with the Pierre Auger Observatory and Progress Toward an in-situ Cross-calibration of Auger and Telescope Array Surface Detector Stations." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1512730856642865.
Повний текст джерелаHalliday, Robert Paul. "Electronics and Timing for the AugerPrime Upgrade and Correlation of Starburst Galaxies with Arrival Directions of Ultra High Energy Cosmic Rays." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1553599216169462.
Повний текст джерелаVoigt, Bernhard. "Sensitivity of the IceCube detector for ultra-high energy electron-neutrino events." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2008. http://dx.doi.org/10.18452/15850.
Повний текст джерелаIceCube is a neutrino telescope currently under construction in the glacial ice at South Pole. At the moment half of the detector is installed, when completed it will instrument 1 km^3 of ice providing a unique experimental setup to detect high energy neutrinos from astrophysical sources. In this work the sensitivity of the complete IceCube detector for a diffuse electron-neutrino flux is analyzed, with a focus on energies above 1 PeV. Emphasis is put on the correct simulation of the energy deposit of electromagnetic cascades from charged-current electron-neutrino interactions. Since existing parameterizations lack the description of suppression effects at high energies, a simulation of the energy deposit of electromagnetic cascades with energies above 1 PeV is developed, including cross sections which account for the LPM suppression of bremsstrahlung and pair creation. An attempt is made to reconstruct the direction of these elongated showers. The analysis presented here makes use of the full charge waveform recorded with the data acquisition system of the IceCube detector. It introduces new methods to discriminate efficiently between the background of atmospheric muons, including muon bundles, and cascade signal events from electron-neutrino interactions. Within one year of operation of the complete detector a sensitivity of 1.5*10^-8 E^-2 GeV/(cm^2 sr s) is reached, which is valid for a diffuse electron-neutrino flux in the energy range from 16 TeV to 13 PeV. Including all neutrino flavors in this analysis, an improvement of at least one order of magnitude is expected, reaching the anticipated performance of a diffuse muon analysis.
Valtonen-Mattila, Nora. "High Energy gamma-ray behavior of a potential astrophysical neutrino source : The case of TXS 0506+056." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-90569.
Повний текст джерелаCaccianiga, Lorenzo. "Cosmic-ray astronomy at the highest energies with ten years of data of the Pierre Auger observatory." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066643/document.
Повний текст джерелаIdentifying the sources of the ultra-high energy cosmic rays (UHECRs, above 10^{18} eV), the most energetic particles known in the universe, would be an important leap forward for both the astrophysics and particle physics knowledge. However, developing a cosmic-ray astronomy is arduous because magnetic fields, that permeate our Galaxy and the extra-Galactic space, deflect cosmic rays that may lose the directional information on their sources. This problem can be reduced by studying the highest energy end of the cosmic ray spectrum. Indeed, magnetic field deflections are inversely proportional to the cosmic ray energy. Moreover, above 4x10^{19} eV, cosmic rays interact with cosmic photon backgrounds, losing energy. This means that the sources of the highest energy cosmic rays observed on Earth can be located only in the nearby universe (200 Mpc or less). The largest detector ever built for detecting cosmic rays at such high energies is the Pierre Auger Observatory, in Argentina. It combines a 3000 km^2 surface array of water Cherenkov detectors with fluorescence telescopes to measure extensive air showers initiated by the UHECRs. This thesis was developed inside the Auger Collaboration and was devoted to study the highest energy events observed by Auger, starting from the selection and reconstruction up to the analysis of their distribution in the sky. Moreover, since the composition at these energies is unknown, we developed a method to select proton-like events, since high Z cosmic rays are too much deflected by magnetic fields to be used for cosmic-ray astronomy
Machado, Laura Paulucci. "Matéria de quarks (strangelets) de origem astrofísica e sua detecção por experimentos terrestres." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26112008-100951/.
Повний текст джерелаThe strange quark matter hypothesis, which states that a plasma composed of quarks up, down and strange in roughly equal amounts is absolutely stable at zero pressure, has been studied for more than twenty years, both theoretically and during searches for its detection in specific experiments. If strange quark matter is indeed stable, then there could be important implications for the field of Astrophysics. Among the most stimulating ones is the possibility of conversion of ordinary nuclear matter in strange quark matter in the interior of neutron stars due to the extremely high densities reached in the core of these compact objects. Processes such as the merger in neutron star binaries systems and supernovae themselves, responsible for the birth of these stars, may eject lumps of strange quark matter, termed strangelets, in the interstellar medium. In this way, strangelets may be present among the cosmic ray flux and be subjected to elementary processes much in the same way as ordinary nuclei. In this Thesis, strangelets are studied from their likely astrophysical production sites, passing through the interstellar medium until they reach the Earth neighborhood. Estimates of the low energy flux of strangelets that could be trapped in the terrestrial magnetosphere are given. Also, the interaction of these particles with components in the Earth atmosphere are studied with the aim of providing better understanding of the resulting observational signatures. It allows the determination of the relevant characteristics for the identification of these exotics by experiments testing the cosmic ray flux, helping to better understand the properties of nuclear matter at high densities and low temperatures.
Coste, Benoît. "Mesure et phénoménologie du rayonnement cosmique avec l'expérience CREAM." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00821110.
Повний текст джерелаFalletti, Lola. "Étude de la région de la source non-identifiée HESS J1745-303 avec l'instrument LAT à bord du satellite Fermi." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2013. http://tel.archives-ouvertes.fr/tel-00917396.
Повний текст джерелаOu, Ziwei. "Supernova remnants as PeVatron candidates : analysis and modeling of simulated data from the Cherenkov Telescope Array." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS421.
Повний текст джерелаThe origin of the knee in the cosmic-ray spectrum at PeV energies is still an open question. Due to their large budget, supernova remnants (SNRs) are plausible candidates for these so-called PeVatrons. The accelerated charged particles interact with surrounding matter, produce neutral pion particles which consequently decay into high-energy gamma rays. These gamma rays, that are in TeV energies for PeVatrons, can then be detected by Cherenkov telescopes or other gamma observations. In this thesis work, we study the potential of Cherenkov Telescope Array (CTA) to observe such gamma rays. After selecting potential galactic PeVatron candidates present in the simulated Data Challenge One (DC-1) of CTA, we reconstruct their spectral energy distribution (SED) by using ctools package. In case measured data in other wavelengths exist, we combine this to the simulated SEDs to perform Multi-Wavelength (MWL) analysis. The SEDs are then fitted by using different non-thermal radiative models, including hadronic pi0 component. For the modelling we use the Naima package. Several results are obtained. The spectral parameters are reconstructed in good agreement with parameters used in DC-1. Simulations giving confidence for the data analysis process. Some potential PeVatron candidates having hard energy spectra are found among the studied SNRs. It is also shown that the MWL data gives good constrain for SED modelling and allows to determine whether a hadronic component is present in the data. If the DC-1 data were representative of reality, we could rule out most of the sources. Possible improvements in the input spectral models to be simulated for the next Data Challenge of CTA are proposed
Plotnikov, Illya. "Ondes de choc relativistes." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00961589.
Повний текст джерелаJones, David I. "Exploring cosmic-ray acceleration in the galactic realm." 2009. http://hdl.handle.net/2440/61076.
Повний текст джерелаhttp://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1456598
Thesis (Ph.D.) -- University of Adelaide, School of Chemistry and Physics, 2009
Szabo, Anthony Paul. "High energy emissions from astrophysical objects / Anthony Paul Szabo." Thesis, 1992. http://hdl.handle.net/2440/20851.
Повний текст джерелаThomas-Albury, Justin Mark. "Extending the Energy Range of Ultra-High Energy Cosmic Ray Fluorescence Detectors." Thesis, 2020. http://hdl.handle.net/2440/130770.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Physical Sciences, 2020
Whelan, Benjamin James. "A magnetic spectrometer analysis method for ultra high energy cosmic ray data." Thesis, 2012. http://hdl.handle.net/2440/72154.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Chemistry and Physics, 2012
Lee, Anthony A. "Application of Monte Carlo methods to some problems in high energy astrophysics / Anthony A. Lee." Thesis, 1993. http://hdl.handle.net/2440/21417.
Повний текст джерелаPetrashyk, Andrii. "Advancements in Very-High-Energy Gamma-Ray Astronomy with Applications to the Study of Cosmic Rays." Thesis, 2019. https://doi.org/10.7916/d8-9ej9-bz11.
Повний текст джерелаŠtefánik, Stanislav. "Studium urychlování vysokoenergetických částic v extragalaktických objektech." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-330741.
Повний текст джерела