Log in

Relevant bibliographies by topics / Gamma ray sources / Journal articles

To see the other types of publications on this topic, follow the link: Gamma ray sources.

Journal articles on the topic 'Gamma ray sources'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Gamma ray sources.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

2

Romero, Gustavo E. "Microquasars and Gamma-ray Sources." Chinese Journal of Astronomy and Astrophysics 5, S1 (2005): 110–20. http://dx.doi.org/10.1088/1009-9271/5/s1/110.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Aharonian, F. A. "Galactic TeV gamma-ray sources." Astroparticle Physics 11, no. 1-2 (1999): 225–34. http://dx.doi.org/10.1016/s0927-6505(99)00055-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

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 (1987): 243–50. http://dx.doi.org/10.1093/mnras/228.2.243.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

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 (1990): 153–58. http://dx.doi.org/10.1007/bf00640703.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Kato, S., D. Chen, J. Huang та ін. "On the Source Contribution to the Galactic Diffuse Gamma Rays above 398 TeV Detected by the Tibet ASγ Experiment". Astrophysical Journal Letters 961, № 1 (2024): L13. http://dx.doi.org/10.3847/2041-8213/ad19d2.

Full text

Abstract:

Abstract Potential contribution from gamma-ray sources to the Galactic diffuse gamma rays observed above 100 TeV (sub-PeV energy range) by the Tibet ASγ experiment is an important key to interpreting recent multimessenger observations. This paper reveals a surprising fact: none of the 23 Tibet ASγ diffuse gamma-ray events above 398 TeV within the Galactic latitudinal range of ∣b∣ < 10° come from the 43 sub-PeV gamma-ray sources reported in the 1LHAASO catalog, which proves that these sources are not the origins of the Tibet ASγ diffuse gamma-ray events. No positional overlap between the Tib

APA, Harvard, Vancouver, ISO, and other styles

7

PIRAN, TSVI. "GAMMA-RAY BURSTS." International Journal of Modern Physics A 17, no. 20 (2002): 2727–31. http://dx.doi.org/10.1142/s0217751x02011680.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

8

Nesci, R., G. Tosti, T. Pursimo, R. Ojha, and M. Kadler. "Near-infrared and gamma-ray monitoring of TANAMI gamma-ray bright sources." Astronomy & Astrophysics 555 (June 18, 2013): A2. http://dx.doi.org/10.1051/0004-6361/201321094.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

GHISELLINI, GABRIELE. "EXTRAGALACTIC GAMMA-RAYS: GAMMA RAY BURSTS AND BLAZARS." International Journal of Modern Physics A 20, no. 29 (2005): 6991–7000. http://dx.doi.org/10.1142/s0217751x05030673.

Full text

Abstract:

The extragalactic gamma-ray sky is dominated by two classes of sources: Gamma-Ray Bursts (GRBs) and radio loud active galactic nuclei whose jets are pointing at us (blazars). We believe that the radiation we receive from them originates from the transformation of bulk relativistic energy into random energy. Although the mechanisms to produce, collimate and accelerate the jets in these sources are uncertain, it is fruitful to compare the characteristics of both classes of sources in search of enlightening similarities. I will review some general characteristics of radio loud AGNs and GRBs and I

APA, Harvard, Vancouver, ISO, and other styles

10

Partenheimer, Angelina, Ke Fang, Rafael Alves Batista, and Rogerio Menezes de Almeida. "Ultra-high-energy Cosmic-Ray Sources Can Be Gamma-Ray Dim." Astrophysical Journal Letters 967, no. 1 (2024): L15. http://dx.doi.org/10.3847/2041-8213/ad4359.

Full text

Abstract:

Abstract Ultra-high-energy cosmic rays (UHECRs), accelerated hadrons that can exceed energies of 1020 eV, are the highest-energy particles ever observed. While the sources producing UHECRs are still unknown, the Pierre Auger Observatory has detected a large-scale dipole anisotropy in the arrival directions of cosmic rays above 8 EeV. In this work, we explore whether resolved gamma-ray sources can reproduce the Auger dipole. We use various Fermi Large Area Telescope catalogs as sources of cosmic rays in CRPropa simulations. We find that in all cases, the simulated dipole has an amplitude signif

APA, Harvard, Vancouver, ISO, and other styles

11

Chen, Yang, Xiao-Jun Bi, Kun Fang, et al. "Chapter 2 Galactic Gamma-ray Sources *." Chinese Physics C 46, no. 3 (2022): 030002. http://dx.doi.org/10.1088/1674-1137/ac3fa8.

Full text

Abstract:

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 cruc

APA, Harvard, Vancouver, ISO, and other styles

12

Narayan, R., and T. Piran. "Do gamma-ray burst sources repeat?" Monthly Notices of the Royal Astronomical Society 265, no. 1 (1993): L65—L68. http://dx.doi.org/10.1093/mnras/265.1.l65.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Weekes, Trevor C. "Very high‐energy gamma‐ray sources." Physics Teacher 24, no. 1 (1986): 20–28. http://dx.doi.org/10.1119/1.2341927.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Meegan, Charles A., Dieter H. Hartmann, J. J. Brainerd, et al. "Do Gamma-Ray Burst Sources Repeat?" Astrophysical Journal 446 (June 1995): L15. http://dx.doi.org/10.1086/187919.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Kronenberg, S., G. J. Brucker, E. Bechtel, and F. Gentner. "Directional Detector of Gamma Ray Sources." Health Physics 70, no. 4 (1996): 505–11. http://dx.doi.org/10.1097/00004032-199604000-00007.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Nolan, P. L., W. F. Tompkins, I. A. Grenier, and P. F. Michelson. "Variability of EGRET Gamma‐Ray Sources." Astrophysical Journal 597, no. 1 (2003): 615–27. http://dx.doi.org/10.1086/378353.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Bhatia, V. B., S. Mishra, and N. Panchapakesan. "Globular clusters as gamma ray sources." Journal of Astrophysics and Astronomy 13, no. 4 (1992): 287–91. http://dx.doi.org/10.1007/bf02702266.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Pavlenko, E., V. Malanushenko, S. Shugarov, and D. Chochol. "Cataclysmic Variables and Gamma-Ray Sources." EAS Publications Series 61 (2013): 255–57. http://dx.doi.org/10.1051/eas/1361039.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

McLaughlin, M. A., J. R. Mattox, J. M. Cordes, and D. J. Thompson. "Variability ofCGRO/EGRET Gamma‐Ray Sources." Astrophysical Journal 473, no. 2 (1996): 763–72. http://dx.doi.org/10.1086/178188.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Aharonian, F. A. "VHE gamma-ray sources and implications." Il Nuovo Cimento C 19, no. 6 (1996): 981–90. http://dx.doi.org/10.1007/bf02508140.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Paggi, Alessandro, R. D'Abrusco, F. Massaro, et al. "Multi-wavelength selection and identification of gamma-ray blazar candidates." Proceedings of the International Astronomical Union 10, S313 (2014): 58–63. http://dx.doi.org/10.1017/s1743921315001878.

Full text

Abstract:

AbstractA significant fraction (~ 30%) of the gamma-ray sources detected by the Fermi Gamma-ray Space Telescope is still of unknown origin, being not yet associated with counterparts at lower energies. Many unidentified gamma-ray sources (UGSs) could be blazars, the largest identified population of extragalactic gamma-ray sources and the rarest class of active galactic nuclei. In particular, it has been found that blazars occupy a defined region in WISE three dimensional color space, well separated from that occupied by other sources in which thermal emission prevails. For farther sources with

APA, Harvard, Vancouver, ISO, and other styles

23

Eichler, David. "Particle Acceleration in High-Energy Gamma-Ray Sources." International Astronomical Union Colloquium 142 (1994): 877–81. http://dx.doi.org/10.1017/s0252921100078246.

Full text

Abstract:

AbstractMany proficient gamma-ray sources show energy spectra that are consistent with E−2 primary spectra. Such sources include recently identified gamma-ray quasars and some gamma-ray bursts. Assuming thick target conversion, this is consistent with shock acceleration, and the dominance of the gamma rays of the luminosity is also consistent with previous predictions of high production efficiency of fresh cosmic rays in shocks. The spectral cutoffs in the gamma rays may offer clues as to whether the high-energy particles are electrons or protons. Resolution of this matter might have implicati

APA, Harvard, Vancouver, ISO, and other styles

24

Shao, Xi, Philip G. Edwards, Jamie Stevens, Minfeng Gu, Timothy J. Galvin, and Minh T. Huynh. "The spectral behaviour and variability of narrow-line Seyfert 1 galaxies with Australia Telescope Compact Array observations." Monthly Notices of the Royal Astronomical Society 536, no. 2 (2024): 1344–56. https://doi.org/10.1093/mnras/stae2662.

Full text

Abstract:

ABSTRACT We present multifrequency radio data for a sample of Narrow-Line type 1 Seyfert (NLS1) galaxies. We first focus on the sub-class of gamma-ray emitting NLS1 galaxies, studying the long-term radio variability of five sources and comparing it to their gamma-ray state. We then extend the observations of the southern NLS1 galaxy sample of Chen et al. by observing several candidate NLS1 sources for the first time, and re-observing several other gamma-ray-quiet sources to obtain a first indication of their radio variability. We find that the gamma-ray emitting NLS1 galaxies are highly variab

APA, Harvard, Vancouver, ISO, and other styles

25

Paliya, Vaidehi S., D. J. Saikia, Alberto Domínguez, and C. S. Stalin. "Radio Morphology of Gamma-Ray Sources: Double-lobed Radio Sources." Astrophysical Journal 976, no. 1 (2024): 120. http://dx.doi.org/10.3847/1538-4357/ad85e2.

Full text

Abstract:

Abstract The extragalactic γ-ray sky is dominated by relativistic jets aligned to the observer’s line of sight, i.e., blazars. A few of their misaligned counterparts, e.g., radio galaxies, are also detected with the Fermi-Large Area Telescope (LAT), albeit in a small number (∼50), indicating the crucial role played by the jet viewing angle in detecting γ-ray emission from jets. These γ-ray emitting misaligned active galactic nuclei (AGN) provide us with a unique opportunity to understand the high-energy emission production mechanisms from a different viewpoint than the more common blazars. Wit

APA, Harvard, Vancouver, ISO, and other styles

26

Principe, G., L. Di Venere, M. Orienti, et al. "Gamma-ray emission from young radio galaxies and quasars." Monthly Notices of the Royal Astronomical Society 507, no. 3 (2021): 4564–83. http://dx.doi.org/10.1093/mnras/stab2357.

Full text

Abstract:

ABSTRACT According to radiative models, radio galaxies and quasars are predicted to produce gamma rays from the earliest stages of their evolution. Exploring their high-energy emission is crucial for providing information on the most energetic processes, the origin and the structure of the newly born radio jets. Taking advantage of more than 11 yr of Fermi-LAT data, we investigate the gamma-ray emission of 162 young radio sources (103 galaxies and 59 quasars), the largest sample of young radio sources used so far for such a gamma-ray study. We separately analyse each source and perform the fir

APA, Harvard, Vancouver, ISO, and other styles

27

Tavani, Marco. "Non-Blazar Gamma-Ray Variables in the Galactic Plane: A New Class of Gamma-Ray Sources." Highlights of Astronomy 11, no. 2 (1998): 771–74. http://dx.doi.org/10.1017/s1539299600018748.

Full text

Abstract:

AbstractWe discuss recent detections of time-variable gamma-ray sources near the Galactic plane. A new bright gamma-ray transient was detected by EGRET in June 1995 near the Galactic center (GRO J1838-04). Also one of the most interesting unidentified gamma-ray sources in the plane, 2CG 135+1, was recently shown to be variable. Both GRO J1838-04 and 2CG 135+1 share many characteristics: variability of the gamma-ray flux within days/weeks, occasional peak gamma-ray emission of comparable flux (˜ 4 x 10-6ph cm-2s-1), absence of radio-loud spectrally-flat AGNs or prominent radio pulsars within th

APA, Harvard, Vancouver, ISO, and other styles

28

Tanimori, Toru. "Galactic TeV Gamma-Ray Sources and Cosmic-Ray Origin." Progress of Theoretical Physics Supplement 151 (2003): 234–39. http://dx.doi.org/10.1143/ptps.151.234.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Murphy, D. W., S. J. Tingay, R. A. Preston, et al. "VLBI of Southern EGRET Identifications." International Astronomical Union Colloquium 164 (1998): 55–56. http://dx.doi.org/10.1017/s025292110004450x.

Full text

Abstract:

AbstractWe have undertaken VLBI observations of 8 Southern Hemisphere EGRET radio sources. Using our data as well as data obtained from the literature we have examined the difference in radio properties between gamma-ray loud and gamma-ray quiet radio sources. In particular, we find no evidence that gamma-ray loud radio sources lie preferentially in sources with straight radio jets as has been suggested.

APA, Harvard, Vancouver, ISO, and other styles

30

Kaci, Samy, and Gwenael Giacinti. "Imprints of PeV cosmic-ray sources on the diffuse gamma-ray emission." Journal of Cosmology and Astroparticle Physics 2025, no. 01 (2025): 049. https://doi.org/10.1088/1475-7516/2025/01/049.

Full text

Abstract:

Abstract We present our new model for the description of the very high energy Galactic gamma-ray emission based on a discrete injection of cosmic rays by individual sources. We investigate the morphology of the very high energy gamma-ray sky, the detectability of cosmic-ray sources and the clumpiness of the diffuse gamma-ray flux, assuming two different scenarios for cosmic-ray propagation. Namely, a standard isotropic and homogeneous diffusion process and an isotropic and inhomogeneous diffusion process. We notably formulate a possible explanation to the small number of hadronic PeVatrons rec

APA, Harvard, Vancouver, ISO, and other styles

31

Ding, Jaymin, and Antonio C. Rodriguez. "Improved Fermi Blazar Candidate Classifications with SRG/eROSITA X-Ray Counterparts Using Machine Learning." Publications of the Astronomical Society of the Pacific 137, no. 6 (2025): 064105. https://doi.org/10.1088/1538-3873/ade479.

Full text

Abstract:

Abstract Gamma-ray sources are among the highest energy phenomena in the Universe and are important laboratories for the study of particle acceleration and relativistic astrophysics. The classification of gamma-ray sources in the past has been aided by the incorporation of multiwavelength observations. In this study, we classify different types of active galactic nuclei by applying machine learning (ML) techniques to a crossmatch of newly released gamma-ray and X-ray catalogs for the first time: the Fermi Gamma-ray Large Area Telescope Fourth Source Catalog and the recent, first release of the

APA, Harvard, Vancouver, ISO, and other styles

32

Ghisellini, Gabriele. "X-Ray and Gamma–Ray Emission in Blazars." Symposium - International Astronomical Union 175 (1996): 413–16. http://dx.doi.org/10.1017/s0074180900081286.

Full text

Abstract:

More than 50 sources have been detected by EGRET in 4 years of operations (e.g. von Montigny et al. 1995). Almost all of them show the violent characteristics typical of blazars, such as superluminal motions, strong radio emission mainly produced in a flat spectrum core and large amplitude variability at all frequencies. Interestingly, optical polarization does not seem to be required, since more than 1/3 of the detected sources are less than 3% polarized.

APA, Harvard, Vancouver, ISO, and other styles

33

Mohammed, Mohammed Siddig H., Abdulsalam Alhawsawi, M. S. Aljohani, Mohammed M. Damoom, Essam M. Banoqitah, and Ezzat Elmoujarkach. "Prompt gamma-ray methods for industrial process evaluation: A simulation study." Nukleonika 67, no. 1 (2022): 11–18. http://dx.doi.org/10.2478/nuka-2022-0001.

Full text

Abstract:

Abstract Radioisotope applications in industrial process inspection and evaluation using gamma-ray emitters provide otherwise unavailable information. Offering alternative gamma-ray sources can support the technology by complementing sources’ availability and radiation safety. This work proposes to replace gamma-ray from radioisotopes with prompt gamma-ray from the interaction of neutrons with stable isotopes injected into the industrial process or with the structural material of the industrial process equipment. Monte Carlo N-Particle Transport Code (MCNP5) was used to simulate the irradiatio

APA, Harvard, Vancouver, ISO, and other styles

34

Kato, S., R. Alves Batista, M. Anzorena, et al. "A Discussion on the Origin of the Sub-PeV Galactic Gamma-Ray Emission." Astrophysical Journal 984, no. 2 (2025): 98. https://doi.org/10.3847/1538-4357/adcb45.

Full text

Abstract:

Abstract Galactic diffuse gamma-ray flux measured by the Tibet ASγ experiment and the total Galactic gamma-ray flux measured by the Large High Altitude Air Shower Observatory (LHAASO) are found to be consistent, within the statistical and systematic uncertainties, for the inner Galactic plane region in the sub-PeV energy range (E > 1014 eV). The result suggests that the sub-PeV Galactic gamma-ray flux is dominated by the diffuse emission. On the other hand, the LHAASO observations suggest that the sub-PeV gamma-ray sources presented in the first LHAASO catalog possibly give a significant co

APA, Harvard, Vancouver, ISO, and other styles

35

Joffre, S., N. Torres-Albà, M. Ajello, D. Kocevski, and R. Buehler. "Historical Fermi All-sky Variability Analysis of Galactic Flares." Astrophysical Journal 968, no. 1 (2024): 44. http://dx.doi.org/10.3847/1538-4357/ad4494.

Full text

Abstract:

Abstract The Fermi All-sky Variability Analysis (FAVA) provides a photometric alternative for identifying week-long gamma-ray flares across the entire sky while being independent of any diffuse Galactic or isotropic emission model. We reviewed 779 weeks of Fermi Large Area Telescope data analyzed by FAVA to estimate the rate and origin of Galactic gamma-ray flares, and to search for new variable Galactic gamma-ray transients. We report an estimated yearly rate of ∼8.5 Galactic gamma-ray flares yr–1, with ∼1 flare yr–1 coming from unknown sources. Out of the known gamma-ray sources that are spa

APA, Harvard, Vancouver, ISO, and other styles

36

Wang, Xiang-Yu, Xiao-Jun Bi, Zhen Cao, et al. "Chapter 3 Extra-galactic gamma-ray sources *." Chinese Physics C 46, no. 3 (2022): 030003. http://dx.doi.org/10.1088/1674-1137/ac3fa9.

Full text

Abstract:

Abstract Extra-galactic gamma-ray sources, such as gamma-ray bursts, active galactic nuclei, starburst galaxies, are interesting and important targets for LHAASO observations. In this chapter, the prospects of detecting these sources with LHAASO and their physical implications are studied. The upgrade plan for the Water Cherenkov Detector Array (WCDA), which aims to enhance the detectability of relatively lower energy photons, is also presented. In addition, a study on constraining the extragalactic background light with LHAASO observation of blazars is presented.

APA, Harvard, Vancouver, ISO, and other styles

37

Hisamoto, Chuck S., and Suneel I. Sheikh. "Spacecraft Navigation Using Celestial Gamma-Ray Sources." Journal of Guidance, Control, and Dynamics 38, no. 9 (2015): 1765–74. http://dx.doi.org/10.2514/1.g001008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Quashnock, J. M., and D. Q. Lamb. "Evidence that gamma-ray burst sources repeat." Monthly Notices of the Royal Astronomical Society 265, no. 1 (1993): L59—L64. http://dx.doi.org/10.1093/mnras/265.1.l59.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Best, S., and J. Bazo. "Gamma-ray counterparts of radio astrophysical sources." Journal of Cosmology and Astroparticle Physics 2019, no. 12 (2019): 004. http://dx.doi.org/10.1088/1475-7516/2019/12/004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Han, Zhao-Xia, and Li Zhang. "Variability Analysis of EGRET Gamma-Ray Sources." Chinese Journal of Astronomy and Astrophysics 5, no. 3 (2005): 256–64. http://dx.doi.org/10.1088/1009-9271/5/3/005.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Paredes, Josep M. "Microquasars as High-energy Gamma-ray Sources." Chinese Journal of Astronomy and Astrophysics 5, S1 (2005): 121–32. http://dx.doi.org/10.1088/1009-9271/5/s1/121.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Wang, V. C., and R. E. Lingenfelter. "Repeating sources of classical gamma-ray bursts." Astrophysical Journal 441 (March 1995): 747. http://dx.doi.org/10.1086/175396.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Bulgarelli, A., V. Fioretti, N. Parmiggiani, et al. "Second AGILE catalogue of gamma-ray sources." Astronomy & Astrophysics 627 (June 25, 2019): A13. http://dx.doi.org/10.1051/0004-6361/201834143.

Full text

Abstract:

Aims. We present the second AGILE–GRID catalogue (2AGL) of γ-ray sources in the energy range 100 MeV–10 GeV. Methods. With respect to previous AGILE–GRID catalogues, the current 2AGL catalogue is based on the first 2.3 years of science data from the AGILE mission (the so-called pointing mode) and incorporates more data and several analysis improvements, including better calibrations at the event reconstruction level, an updated model for the Galactic diffuse γ-ray emission, a refined procedure for point-like source detection, and the inclusion of a search for extended γ-ray sources. Results. T

APA, Harvard, Vancouver, ISO, and other styles

44

MÉSZÁROS, PETER. "GAMMA-RAY BURSTS AS VHE-UHE SOURCES." International Journal of Modern Physics D 17, no. 09 (2008): 1319–32. http://dx.doi.org/10.1142/s0218271808012875.

Full text

Abstract:

Gamma-ray bursts are capable of accelerating cosmic rays up to GZK energies Ep ~ 1020 eV, which can lead to a flux at Earth comparable to that observed by large EAS arrays such as Auger. The semi-relativistic outflows inferred in GRB-related hypernovae are also likely sources of somewhat lower energy cosmic rays. Leptonic processes, such as synchrotron and inverse Compton, as well as hadronic processes, can lead to GeV-TeV gamma-rays measurable by GLAST, AGILE, or ACTs, providing useful probes of the burst physics and model parameters. Photo-meson interactions also produce neutrinos at energie

APA, Harvard, Vancouver, ISO, and other styles

45

Asano, Katsuaki, and Kohta Murase. "Gamma-Ray Bursts as Multienergy Neutrino Sources." Advances in Astronomy 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/568516.

Full text

Abstract:

We review theoretical models for nonelectromagnetic emission, mainly neutrinos and cosmic rays, from gamma-ray bursts (GRBs). In various stages of the relativistic jet propagation, cosmic-ray ion acceleration and subsequent neutrino emission are expected. GRBs are popular candidate sources of the highest-energy cosmic rays, and their prompt phase has been most widely discussed. IceCube nondetection of PeV neutrinos coincident with GRBs has put interesting constraints on the standard theoretical prediction. The GRB-UHECR hypothesis can critically be tested by future observations. We also emphas

APA, Harvard, Vancouver, ISO, and other styles

46

Vernetto, S. "Gamma ray sources observed with ARGO-YBJ." Nuclear Physics B - Proceedings Supplements 239-240 (June 2013): 98–103. http://dx.doi.org/10.1016/j.nuclphysbps.2013.05.016.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Kaufman Bernadó, M. M., G. E. Romero, and I. F. Mirabel. "Precessing microblazars and unidentified gamma-ray sources." Astronomy & Astrophysics 385, no. 2 (2002): L10—L13. http://dx.doi.org/10.1051/0004-6361:20020251.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

McLaughlin, M. A., J. R. Mattox, J. M. Cordes, and D. J. Thompson. "Variability of CGRO/EGRET Gamma Ray Sources." International Astronomical Union Colloquium 160 (1996): 357–58. http://dx.doi.org/10.1017/s0252921100041889.

Full text

Abstract:

We have developed a method for quantifying the flux variabilities of high energy gamma ray sources. We have applied this method to 128 sources listed in the second catalog of sources detected with the Energetic Gamma Ray Experiment Telescope (EGRET) (Thompson et. al. 1995). These sources include the Large Magellanic Cloud, 5 pulsars, 41 active galactic nuclei (AGN), and 81 sources not yet identified with known objects.Our data include photon maps (E &gt; 100 MeV) from 134 EGRET viewing periods spanning a roughly 3year period. Each source was observed in 3-20 viewing periods ranging from a

APA, Harvard, Vancouver, ISO, and other styles

49

Pizzichini, Graziella, and M. Rosaria Cristallo. "Identification of X and Gamma-Ray sources." Advances in Space Research 11, no. 8 (1991): 49–53. http://dx.doi.org/10.1016/0273-1177(91)90149-e.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Mendonça, J. T., and A. Serbeto. "Gamma ray sources using imperfect relativistic mirrors." Physics of Plasmas 15, no. 11 (2008): 113105. http://dx.doi.org/10.1063/1.3001690.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!