Results 1 to 10 of about 19,422 (206)

A 34.5 day quasi-periodic oscillation in γ-ray emission from the blazar PKS 2247–131 [PDF]

Nature Communications, 2018
PKS 2247–131 is an active galaxy that has been emitting gamma-ray flares since October 2016. Here, the authors used data obtained with the Fermi Gamma-ray Space Telescope to find that PKS 2247–131 presents a relatively short, month-like flux oscillation ...
Jianeng Zhou, Zhongxiang Wang, Liang Chen, Paul J. Wiita, Jithesh Vadakkumthani, Nidia Morrell, Pengfei Zhang, Jujia Zhang   +7 more
doaj   +2 more sources

Identification of Gamma-Ray Point Sources in Fermi-LAT Data with Minimum Spanning Tree Algorithm [PDF]

Iranian Journal of Astronomy and Astrophysics, 2023
Gamma rays are the most energetic photons in the electromagnetic spectrum, detected with ground-based and space-based detectors in different energy ranges from sources in our galaxy and beyond.
Mehran Soor, Fatemeh Akhondi, Hadi Hedayati   +2 more
doaj   +1 more source

GRAINE project: precise gamma-ray observations with balloon-borne emulsion telescope [PDF]

EPJ Web of Conferences, 2019
Observation of cosmic gamma rays is important in the understanding of high-energy objects or phenomena in the universe. Since 2008, the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope (Fermi-LAT) has surveyed the sub-GeV/GeV gamma-ray ...
Rokujo Hiroki
doaj   +1 more source

The Third Fermi Large Area Telescope Catalog of Gamma-Ray Pulsars

The Astrophysical Journal, 2023
We present 294 pulsars found in GeV data from the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope. Another 33 millisecond pulsars (MSPs) discovered in deep radio searches of LAT sources will likely reveal pulsations once phase-connected
D. A. Smith, S. Abdollahi, M. Ajello, M. Bailes, L. Baldini, J. Ballet, M. G. Baring, C. Bassa, J. Becerra Gonzalez, R. Bellazzini, A. Berretta, B. Bhattacharyya, E. Bissaldi, R. Bonino, E. Bottacini, J. Bregeon, P. Bruel, M. Burgay, T. H. Burnett, R. A. Cameron, F. Camilo, R. Caputo, P. A. Caraveo, E. Cavazzuti, G. Chiaro, S. Ciprini, C. J. Clark, I. Cognard, A. Corongiu, P. Cristarella Orestano, M. Crnogorcevic, A. Cuoco, S. Cutini, F. D’Ammando, A. de Angelis, M. E. DeCesar, S. De Gaetano, R. de Menezes, J. Deneva, F. de Palma, N. Di Lalla, F. Dirirsa, L. Di Venere, A. Domínguez, D. Dumora, S. J. Fegan, E. C. Ferrara, A. Fiori, H. Fleischhack, C. Flynn, A. Franckowiak, P. C. C. Freire, Y. Fukazawa, P. Fusco, G. Galanti, V. Gammaldi, F. Gargano, D. Gasparrini, F. Giacchino, N. Giglietto, F. Giordano, M. Giroletti, D. Green, I. A. Grenier, L. Guillemot, S. Guiriec, M. Gustafsson, A. K. Harding, E. Hays, J. W. Hewitt, D. Horan, X. Hou, F. Jankowski, R. P. Johnson, T. J. Johnson, S. Johnston, J. Kataoka, M. J. Keith, M. Kerr, M. Kramer, M. Kuss, L. Latronico, S.-H. Lee, D. Li, J. Li, B. Limyansky, F. Longo, F. Loparco, L. Lorusso, M. N. Lovellette, M. Lower, P. Lubrano, A. G. Lyne, Y. Maan, S. Maldera, R. N. Manchester, A. Manfreda, M. Marelli, G. Martí-Devesa, M. N. Mazziotta, J. E. McEnery, I. Mereu, P. F. Michelson, M. Mickaliger, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, M. E. Monzani, A. Morselli, M. Negro, R. Nemmen, L. Nieder, E. Nuss, N. Omodei, M. Orienti, E. Orlando, J. F. Ormes, M. Palatiello, D. Paneque, G. Panzarini, A. Parthasarathy, M. Persic, M. Pesce-Rollins, R. Pillera, H. Poon, T. A. Porter, A. Possenti, G. Principe, S. Rainò, R. Rando, S. M. Ransom, P. S. Ray, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, N. Renault-Tinacci, R. W. Romani, M. Sánchez-Conde, P. M. Saz Parkinson, L. Scotton, D. Serini, C. Sgrò, R. Shannon, V. Sharma, Z. Shen, E. J. Siskind, G. Spandre, P. Spinelli, B. W. Stappers, T. E. Stephens, D. J. Suson, S. Tabassum, H. Tajima, D. Tak, G. Theureau, D. J. Thompson, O. Tibolla, D. F. Torres, J. Valverde, C. Venter, Z. Wadiasingh, N. Wang, N. Wang, P. Wang, P. Weltevrede, K. Wood, J. Yan, G. Zaharijas, C. Zhang, W. Zhu   +170 more
doaj   +1 more source

XStorm: A New Gamma Ray Spectrometer for Detection of Close Proximity Gamma Ray Glows and TGFs

Journal of Geophysical Research: Atmospheres, Volume 128, Issue 24, 27 December 2023., 2023
Abstract In this paper, we present XStorm, a gamma ray spectrometer developed to detect gamma ray glows and terrestrial gamma ray flashes (TGFs) in close proximity. Measurements are mostly planned to take place on balloon campaigns but also on the ground using bigger detectors.
Melody Pallu, Sebastien Celestin, Yanis Hazem, François Trompier, Gaël Patton   +4 more
wiley   +1 more source

Fully depleted charge‐coupled device design and technology development

Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023
Abstract We describe the advancement of fully depleted charge‐coupled device (CCD) technology for scientific applications. Recent efforts on 650–725 μ$$ \mu $$m‐thick CCDs for direct dark‐matter and radiation detection with single‐electron sensitivity are described, as well as the technology transfer of the fully depleted CCD technology to 200 mm‐wafer
Stephen E. Holland
wiley   +1 more source

Characterization of Thunderstorm Cells Producing Observable Terrestrial Gamma‐Ray Flashes

Journal of Geophysical Research: Atmospheres, Volume 128, Issue 17, 16 September 2023., 2023
Abstract The meteorological conditions required for the production of Terrestrial Gamma‐ray Flashes (TGFs) are not well understood. Particularly, the link between TGF production, meteorology, and weather severity is poorly characterized with most works focusing on only a small set of TGF events or isolated storms.
Lasse Skaaning Husbjerg, Torsten Neubert, Olivier Chanrion, Martino Marisaldi, Martin Stendel, Eigil Kaas, Nikolai Østgaard, Victor Reglero   +7 more
wiley   +1 more source

A tool to understand emission mechanisms of blazars through their high‐energy gamma‐ray emission

Astronomische Nachrichten, Volume 344, Issue 6, August 2023., 2023
The blazar SED is characterized by two energy components. Evidence suggests that the low‐energy component is generated by the synchrotron mechanism, but for the high‐energy component, the mechanism is still uncertain. Two main models have been proposed to explain this emission. According to the leptonic model, a correlation between the emission of both
Mabel Osorio, Erick Rangel, José Rodrigo Sacahui, María Magdalena González   +3 more
wiley   +1 more source

The First GECAM Observation Results on Terrestrial Gamma‐Ray Flashes and Terrestrial Electron Beams

Geophysical Research Letters, Volume 50, Issue 14, 28 July 2023., 2023
Abstract Gravitational‐wave high‐energy Electromagnetic Counterpart All‐sky Monitor (GECAM) is a space‐borne instrument dedicated to monitoring high‐energy transients, including Terrestrial Gamma‐ray Flashes (TGFs) and Terrestrial Electron Beams (TEBs).
Y. Zhao, J. C. Liu, S. L. Xiong, W. C. Xue, Q. B. Yi, G. P. Lu, W. Xu, F. C. Lyu, J. C. Sun, W. X. Peng, C. Zheng, Y. Q. Zhang, C. Cai, S. Xiao, S. L. Xie, C. W. Wang, W. J. Tan, Z. H. An, G. Chen, Y. Q. Du, Y. Huang, M. Gao, K. Gong, D. Y. Guo, J. J. He, B. Li, G. Li, X. Q. Li, X. B. Li, J. Y. Liao, J. Liang, X. H. Liang, Y. Q. Liu, X. Ma, R. Qiao, L. M. Song, X. Y. Song, X. L. Sun, J. Wang, J. Z. Wang, P. Wang, X. Y. Wen, H. Wu, Y. B. Xu, S. Yang, B. X. Zhang, D. L. Zhang, F. Zhang, P. Zhang, H. M. Zhang, Z. Zhang, X. Y. Zhao, S. J. Zheng, K. K. Zhang, X. B. Han, H. Y. Wu, T. Hu, H. Geng, H. B. Zhang, F. J. Lu, S. N. Zhang, H. Yu   +61 more
wiley   +1 more source

Gamma-ray Emission from Globular Clusters [PDF]

Journal of Astronomy and Space Sciences, 2016
Over the last few years, the data obtained using the Large Area Telescope (LAT) aboard the Fermi Gamma-ray Space Telescope has provided new insights on high-energy processes in globular clusters, particularly those involving compact objects such as ...
Pak-Hin T. Tam, Chung Y. Hui, Albert K. H. Kong   +2 more
doaj   +1 more source