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Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Gamma ray sources.'
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Journal articles on the topic "Gamma ray sources":
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ZABALZA, VÍCTOR. "GAMMA-RAY OBSERVATIONS OF GAMMA-RAY BINARIES." International Journal of Modern Physics: Conference Series 28 (January 2014): 1460161. http://dx.doi.org/10.1142/s2010194514601616.
Gamma-ray binaries are binary systems that emit most of their radiative output above 1 MeV. Following the detection of five such systems in the past decade, they have been clearly established as a population of galactic GeV and TeV sources. In this review I discuss their recent gamma-ray observational results from Cherenkov telescopes and the Fermi satellite. A common trend has emerged in the high-energy spectra of several of these sources, with the detection of two separate components at GeV and TeV energies that cannot be explained as being emitted from a single region, and here I discuss a possible scenario giving rise to two separate acceleration locations in gamma-ray binaries.
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Romero, Gustavo E. "Microquasars and Gamma-ray Sources." Chinese Journal of Astronomy and Astrophysics 5, S1 (December 31, 2005): 110–20. http://dx.doi.org/10.1088/1009-9271/5/s1/110.
Kifune, T., M. Sadzinska, J. Wdowczyk, A. W. Wolfendale, A. J. Norton, and R. S. Warwick. "Synchrotron X-ray haloes around gamma ray sources." Monthly Notices of the Royal Astronomical Society 228, no. 2 (September 1, 1987): 243–50. http://dx.doi.org/10.1093/mnras/228.2.243.
Boer, Michel, M. Gottardi, K. Hurley, and G. Pizzichini. "X-ray observations of gamma-ray burst sources." Astrophysics and Space Science 169, no. 1-2 (July 1990): 153–58. http://dx.doi.org/10.1007/bf00640703.
PIRAN, TSVI. "GAMMA-RAY BURSTS." International Journal of Modern Physics A 17, no. 20 (August 10, 2002): 2727–31. http://dx.doi.org/10.1142/s0217751x02011680.
Gamma-Ray Bursts (GRBs) are the most relativistic objects discovered so far. I describe here two aspects of the relativistic nature of GRBs. Their likely association with the formation of black holes and their possible role as sources of gravitational radiation.
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Chen, Yang, Xiao-Jun Bi, Kun Fang, Yi-Qing Guo, Ye Liu, P. H. Thomas Tam, S. Vernetto, Zhong-Xiang Wang, Rui-Zhi Yang, and Xiao Zhang. "Chapter 2 Galactic Gamma-ray Sources *." Chinese Physics C 46, no. 3 (March 1, 2022): 030002. http://dx.doi.org/10.1088/1674-1137/ac3fa8.
Abstract In the γ-ray sky, the highest fluxes come from Galactic sources: supernova remnants (SNRs), pulsars and pulsar wind nebulae, star forming regions, binaries and micro-quasars, giant molecular clouds, Galactic center, and the large extended area around the Galactic plane. The radiation mechanisms of γ-ray emission and the physics of the emitting particles, such as the origin, acceleration, and propagation, are of very high astrophysical significance. A variety of theoretical models have been suggested for the relevant physics, and emission with energies E≥1014 eV are expected to be crucial in testing them. In particular, this energy band is a direct window to test at which maximum energy a particle can be accelerated in the Galactic sources and whether the most probable source candidates such as Galactic center and SNRs are “PeVatrons”. Designed aiming at the very high energy (VHE, >100 GeV) observation, LHAASO will be a very powerful instrument in these astrophysical studies. Over the past decade, great advances have been made in the VHE γ-ray astronomy. More than 170 VHE γ-ray sources have been observed, and among them, 42 Galactic sources fall in the LHAASO field-of-view. With a sensitivity of 10 milli-Crab, LHAASO can not only provide accurate spectra for the known γ-ray sources, but also search for new TeV-PeV γ-ray sources. In the following sub-sections, the observation of all the Galactic sources with LHAASO will be discussed in details.
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Narayan, R., and T. Piran. "Do gamma-ray burst sources repeat?" Monthly Notices of the Royal Astronomical Society 265, no. 1 (November 1, 1993): L65—L68. http://dx.doi.org/10.1093/mnras/265.1.l65.
Bosch-Ramon, V., G. E. Romero, A. T. Araudo, and J. M. Paredes. "Massive protostars as gamma-ray sources." Astronomy and Astrophysics 511 (February 2010): A8. http://dx.doi.org/10.1051/0004-6361/200913488.
The origin of cosmic-rays is one of the long-standing problems in astro physics. In recent years, strong evidence has been found that certain classes of object contain and are able to accelerate particles to high energies. In this thesis the origin problem is addressed in two different ways. Firstly, two different regions of the Galaxy are studied using γ-ray observations from the COSB satellite combined with atomic and molecular gas measurements. The Vela region contains a pulsar and a supernova remnant and is particularly valuable location for cosmic-ray studies because of its proximity, the association of the two objects, and the intensity of the γ -ray flux it produces. At greater longitudes, the region around the peculiar object η Carinae is also studied. It is rich in potential sources of cosmic rays including active stars and a spiral arm seen at a tangent at l ~ 282º .Analysis of the Vela region reveals strong evidence for cosmic ray production at all energies observed by COSB. The supernova remnant seems the most likely candidate, but the possibility of the pulsar itself producing some of the particles cannot be ruled out. The excess γ -ray emission from around η Carinae does not appear correlated with the active stars but seems to becoming predominantly from the spiral arm. This is the first time evidence has been presented for cosmic-ray acceleration by the spiral shock in a particular, known spiral arm which is observed as a feature in the gas. The γ -rays are produced in the gas clouds associated with this arm. The second approach to the cosmic-ray origin problem involves a model for cosmic-ray production in supernova remnants and is used in association with a Monte-Cailo simulation of their occurrence in the Galaxy. Unlike earlier models (Bhat et al 1987), the motion of the Sun is also taken into account and the supernova explosions occur mainly in spiral arms. The results are in the form of a time sequence of energy density values and tire compared in detail with (^10)Be results. It is found that the model accounts for the long-term rise in the concentration of this radioisotope and does not predict large excursions from the mean energy density that beset older models. Thus the cosmic ray production by supernova remnants seems to be consistent with the radioisotope data.
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吳文謙 and Man-him Ng. "Searching for gamma-ray signals form pulsars and periodic signals fromthe galactic gamma-ray sources." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31213509.
Syson, Alexandra Jane. "Search for unidentified gamma-ray sources." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493790.
This thesis shows how improvements can be made to two dimensional gamma - ray source analysis by using a probabilistic approach to describe the possible source location and likelihood of a candidate gamma-ray event. The mapping algorithm developed assesses the significance of source detection, and background subtraction is implemented both by a modified standard approach and by the development of a multivariate kernel analysis.
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Ng, Man-him. "Searching for gamma-ray signals form pulsars and periodic signals from the galactic gamma-ray sources /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19667942.
The main topic of this thesis is analysis of an unidentified Galactic TeV gamma-ray source, MGRO J1908+06, discovered by Milagro instrument in 2007. We analyzed 54 hours of observational data from the Very Energetic Radiation Imaging Telescope Array System (VERITAS), a ground-based gamma-ray observatory in southern Arizona comprised of an array of four Cherenkov Telescopes that reconstructs the energy and direction of astrophysical gamma-rays by imaging Cherenkov light emitted by energetic particles in air showers produced by the primary gamma-rays. MGRO J1908+06 is located between a supernova remnant SNR G40.5-0.5 and a young, energetic pulsar PSR J1907+0602. We studied the energy dependent morphology of the TeV emission from the source and measured the source extent and spectrum. The source extends well past the boundary of the SNR and is not correlated with strong radio continuum or molecular line emission which likely excludes an origin for the emission as solely due to the SNR. While emission in the 0.5-1.25 TeV band was centered around the pulsar, higher energy emission was observed near the supernova remnant. This morphology is opposite that observed in other pulsar wind nebulae. We proposed two models for the high energy emission located well away from the pulsar but close to the SNR: (1) shock acceleration at the shock front created by an interaction between the pulsar wind and the dense gas at the edge of the SNR or (2) molecular clouds around the SNR provides seed photons with energies higher than those from Cosmic Microwave Backgrounds for inverse Compton scattering. The former model can be tested by looking for molecular emission lines that trace shocks and by measuring the pulsar velocity.
In addition, we investigated the gamma-ray emission from the nova explosion of V407 Cygni that occurred in March 2010. The Fermi-LAT observed this event in the energy range of E >100 MeV. The origins of the gamma-ray emission that the Fermi-LAT team proposed are either protons (hadronic model) or electrons (leptonic model), both of which were accelerated at the nova shock via the Fermi acceleration mechanism. We did not consider their leptonic model because no TeV gamma-ray emission is predicted. Their hadronic model can generate TeV gamma-rays with the modeled parameters. We found no evidence for TeV emission. We showed that with the flux upper limit calculated using the VERITAS data imposes constraints on the extension of the proton spectrum at high energies.
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Edwards, Philip Gregory. "A search for ultra high energy gamma ray emission from binary X-ray systems." Title page, contents and summary only, 1988. http://web4.library.adelaide.edu.au/theses/09PH/09phe266.pdf.
Ciampa, Dominic. "A southern hemisphere search for ultra-high-energy gamma ray sources." Title page, contents and summary only, 1988. http://web4.library.adelaide.edu.au/theses/09PH/09phc565.pdf.
Graham, Lilian Joan. "Ultra high energy gamma ray point sources and cosmic ray anisotropy." Thesis, Durham University, 1994. http://etheses.dur.ac.uk/5594/.
The experimental set-up at the Baksan Air Shower Array, used to detect air showers above ~0.2xl0(^14)eV, is described. An estimation of the angular resolution using the cosmic ray shadow of the Sun and the Moon gives a value of ~2.5˚ which is consistent with previous estimates from Monte-Carlo simulations. Using data from this array covering 1985-1992, a search is made for 7-ray emission from 18 candidate sources. Upper limits to the flux from these sources are stated in all cases. A periodicity search is made on data for which the excess for a single transit of a particular source is above 3(7. The results of this periodicity analysis on such days points to 4 possible observations of pulsed emission at the 95% confidence level. These are 4U0115+63 on 19.03.89, PSR19534-29 on 12.02.85, 1E2259+586 on 01.08.91 and PSR0655+64 on 12.08.89. Without confirmation from other groups however the findings are not significant enough to stand alone. A harmonic analysis has been performed on the 8 years of data and after pressure corrections and a Farley & Storey analysis to eradicate any spurious sidereal variations we find negligible evidence of 2nd or 3rd harmonic but a 1st harmonic amplitude and phase of (12.7 ±1.2) x 10(^-4) at 23.1 ± 0.3hr right ascension. When one takes into account the cosϐ effect on the sidereal anisotropy this value becomes 17.4±1.6xl0(^-4).Future developments and improvements to be undertaken at BASA, including the building of a muon detector, are outlined.
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余君岳 and Kwan-ngok Peter Yu. "The origin of extragalactic gamma rays." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B31231469.
Yu, Kwan-ngok Peter. "The origin of extragalactic gamma rays /." [Hong Kong : University of Hong Kong], 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12362827.
A, Meegan C., and United States. National Aeronautics and Space Administration., eds. Do gamma-ray burst sources repeat? [Washington, D.C: National Aeronautics and Space Administration, 1995.
A, Meegan C., and United States. National Aeronautics and Space Administration., eds. Do gamma-ray burst sources repeat? [Washington, D.C: National Aeronautics and Space Administration, 1995.
A, Meegan C., and United States. National Aeronautics and Space Administration., eds. Do gamma-ray burst sources repeat? [Washington, D.C: National Aeronautics and Space Administration, 1994.
A, Meegan C., and United States. National Aeronautics and Space Administration., eds. Do gamma-ray burst sources repeat? [Washington, D.C: National Aeronautics and Space Administration, 1994.
A, Meegan C., and United States. National Aeronautics and Space Administration., eds. Do gamma-ray burst sources repeat? [Washington, D.C: National Aeronautics and Space Administration, 1994.
A, Meegan C., and United States. National Aeronautics and Space Administration., eds. Do gamma-ray burst sources repeat? [Washington, D.C: National Aeronautics and Space Administration, 1995.
A, Meegan C., and United States. National Aeronautics and Space Administration., eds. Do gamma-ray burst sources repeat? [Washington, D.C: National Aeronautics and Space Administration, 1994.
Alberto, Carramiñana, Reimer Olaf, and Thompson David J, eds. The nature of unidentified galactic high-energy gamma-ray sources: Proceedings of the workshop held at Tonantzintla, Puebla, México, 9-11 October 2000. Dordrecht: Kluwer Academic Publishers, 2001.
Weaver, James T. Calibration of gamma-ray-emitting brachytherapy sources. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1988.
Lu, T., Y. F. Huang, Z. G. Dai, and D. M. Wei. "Gamma-Ray Bursts." In Cosmic Gamma-Ray Sources, 225–60. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2256-2_10.
Thompson, David J. "Gamma Ray Pulsars." In Cosmic Gamma-Ray Sources, 149–68. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2256-2_7.
Moskalenko, Igor V., Andrew W. Strong, and Olaf Reimer. "Diffuse Gamma Rays." In Cosmic Gamma-Ray Sources, 279–310. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2256-2_12.
Reimer, Olaf. "Unidentified Gamma-Ray Sources." In The Universe in Gamma Rays, 319–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04593-0_13.
Cheng, K. S., and Gustavo E. Romero. "Introduction." In Cosmic Gamma-Ray Sources, 1–20. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2256-2_1.
Reimer, Olaf. "Clusters of Galaxies at High Energy Gamma-Rays." In Cosmic Gamma-Ray Sources, 261–78. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2256-2_11.
Mukherjee, Reshmi, and Jules Halpern. "Multifrequency Strategies for the Identification of Gamma-Ray Sources." In Cosmic Gamma-Ray Sources, 311–44. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2256-2_13.
Conference papers on the topic "Gamma ray sources":
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Chernyakova, Maria, and Denys Malyshev. "Gamma-ray binaries." In Multifrequency Behaviour of High Energy Cosmic Sources - XIII. Trieste, Italy: Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.362.0045.
Fegan, S. J. "VHE observations of unidentified EGRET sources." In GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP, 2001. http://dx.doi.org/10.1063/1.1419417.
Thompson, D. J. "Artifact sources near bright EGRET pulsars." In GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP, 2001. http://dx.doi.org/10.1063/1.1419480.
Sturner, Steven J., and Charles D. Dermer. "Scattering atmospheres near gamma-ray burst sources." In Gamma-ray bursts. AIP, 1991. http://dx.doi.org/10.1063/1.42794.
Punch, Michael. "TeV gamma-ray sources." In The international symposium on high energy gamma-ray astronomy. AIP, 2001. http://dx.doi.org/10.1063/1.1370816.
Tornikoski, M. "Possible new identifications for Southern EGRET sources." In GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP, 2001. http://dx.doi.org/10.1063/1.1419481.
Vercellone, S. "Imaging of high energy sources with AGILE." In GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP, 2001. http://dx.doi.org/10.1063/1.1419496.
Ruffert, Maximilian, and Hans-Thomas Janka. "Coalescing neutron stars as possible gamma-ray burst sources." In GAMMA-RAY BURSTS. ASCE, 1998. http://dx.doi.org/10.1063/1.55406.
Weaver, James T., Thomas P. Loftus, and Robert Loevinger. Calibration of gamma-ray-emitting brachytherapy sources. Gaithersburg, MD: National Bureau of Standards, 1988. http://dx.doi.org/10.6028/nbs.sp.250-19.
Howell, Calvin R., Mohammad W. Ahmed, Anuj J. Kapadia, and Ying K. Wu. International Workshop on the Next Generation Gamma-ray Sources. Office of Scientific and Technical Information (OSTI), November 2018. http://dx.doi.org/10.2172/1482379.
Peng, F. Two-Component Jet Models of Gamma-Ray Burst Sources. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/839640.
Torres, D. High-Latitude Molecular Clouds as Gamma-Ray Sources for GLAST. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/839757.
Gibson, D. Novel Multiple-Gigahertz Electron Beams for Advanced X-Ray and Gamma-Ray Light Sources. Office of Scientific and Technical Information (OSTI), October 2014. http://dx.doi.org/10.2172/1178389.
Gibson, Alexander. Mapping Correlation of Two Point Sources in the Gamma-Ray Sky. Office of Scientific and Technical Information (OSTI), August 2015. http://dx.doi.org/10.2172/1213163.
Digel, S. Small Molecular Clouds at High Latitudes as Gamma-Ray Sources for GLAST. Office of Scientific and Technical Information (OSTI), March 2005. http://dx.doi.org/10.2172/839933.
Karam, Lisa R., Leticia Pibida, Michael P. Unterweger, and Larry L. Lucas. Gamma-ray emitting test sources for portal monitors used for homeland security. Gaithersburg, MD: National Bureau of Standards, 2004. http://dx.doi.org/10.6028/nist.tn.1460.
Semenov, V. A. Picosecond Pulse Recirculation for High Average Brightness Thomson Scattering-based Gamma-ray Sources. Office of Scientific and Technical Information (OSTI), June 2009. http://dx.doi.org/10.2172/964528.
Nelson, K., T. Gosnell, and D. Knapp. The Effect of Gamma-ray Detector Energy Resolution on the Ability to Identify Radioactive Sources. Office of Scientific and Technical Information (OSTI), March 2009. http://dx.doi.org/10.2172/952090.
