Results 61 to 70 of about 20,211 (230)

Progress in Multi-wavelength and Multi-Messenger Observations of Blazars and Theoretical Challenges

Galaxies, 2019
This review provides an overview of recent advances in multi-wavelength and multi-messenger observations of blazars, the current status of theoretical models for blazar emission, and prospects for future facilities.
Markus Böttcher
doaj   +1 more source

BL Lacertae Objects and the Extragalactic Gamma-Ray Background

, 2011
A tight correlation between gamma-ray and radio emission is found for a sample of BL Lacertae (BL Lac) objects detected by Fermi Gamma-ray Space Telescope (Fermi) and the Energetic Gamma-Ray Experiment Telescope (EGRET).
Abdo, Abdo, Atwood, Bai, Cao, Chiang, Dermer, Dermer, Dodson, Dondi, Fan, Fan, Fan, Fan Li, Gear, Georganopoulos, Ghisellini, Giroletti, Gu, Hartman, Helmboldt, Horiuchi, Kataoka, Komossa, Kovalev, Liu, Mattox, Michelson, Narumoto, Padovani, Padovani, Sreekumar, Strong, Thompson, Wang, Xin-Wu Cao, Yuan, Zhang, Zhou, Zhou   +39 more
core   +1 more source

Fermi detection of delayed GeV emission from the short GRB 081024B

, 2010
We report on the detailed analysis of the high-energy extended emission from the short Gamma-Ray Burst (GRB) 081024B, detected by the Fermi Gamma-ray Space Telescope.
A. A. Abdo, A. A. Moiseev, A. Bouvier, A. Brez, A. Chekhtman, A. de Angelis, A. J. van der Horst, A. K. Harding, A. Makeev, A. Morselli, A. P. Waite, A. Reimer, A. S. Johnson, A. Sander, A. Tramacere, A. von Kienlin, A. W. Borgland, A. Y. Rodriguez, Abdo ., Abdo ., Asano, Asano, Atwood ., B. Berenji, B. Giebels, B. L. Winer, B. Lott, B. M. Baughman, Bartlett, Bloom, Bottcher, C. Cecchi, C. D. Dermer, C. Farnier, C. Favuzzi, C. Kouveliotou, C. Meegan, C. Meurer, C. Monte, C. Sgrò, C. Wilson-Hodge, Cenko, Connaughton, Corsi, D. A. Smith, D. Bastieri, D. Dumora, D. F. Torres, D. Gasparrini, D. Horan, D. J. Suson, D. J. Thompson, D. Kocevski, D. Paneque, D. Parent, D. Sanchez, Dermer, Dermer, E. Bissaldi, E. Bonamente, E. Charles, E. D. Bloom, E. do Couto e Silva, E. Hays, E. J. Siskind, E. Moretti, E. Nuss, E. Orlando, E. Troja, F. de Palma, F. Gargano, F. Giordano, F. Kuehn, F. Longo, F. Loparco, F. Piron, F. Ryde, G. A. Caliandro, G. Barbiellini, G. Fishman, G. Godfrey, G. Jóhannesson, G. M. Madejski, G. Spandre, G. Tagliaferri, G. Tosti, Gehrels, Ghirlanda, Granot, Guidorzi, Guidorzi, H. F.-W. Sadrozinski, H. Katagiri, H. Tajima, H. Takahashi, He, I. A. Grenier, I. V. Moskalenko, J. B. Thayer, J. Ballet, J. Bregeon, J. Chiang, J. Cohen-Tanugi, J. Conrad, J. D. Scargle, J. E. Grove, J. E. McEnery, J. F. Ormes, J. G. Thayer, J. Granot, J. H. Panetta, J. Kataoka, J. Knödlseder, J. Lande, J. M. Burgess, J. M. Casandjian, J. P. Norris, J. Ripken, K. Asano, K. Bechtol, K. S. Wood, K. Toma, Kaneko, L. Baldini, L. Guillemot, L. Latronico, L. R. Cominsky, L. S. Rochester, L. Tibaldo, Le, M. Ackermann, M. Ajello, M. Axelsson, M. Brigida, M. E. Monzani, M. Frailis, M. Hayashida, M. Kerr, M. Kuss, M. L. Kocian, M. Lemoine-Goumard, M. N. Lovellette, M. N. Mazziotta, M. Ohno, M. Pepe, M. Pesce-Rollins, M. Razzano, M. Roth, M. S. Briggs, M. S. Jackson, M. S. Strickman, M. Stamatikos, M. Ziegler, M.-H. Grondin, Mazets, Meegan, N. Gehrels, N. Giglietto, N. Kawai, N. Komin, N. Omodei, N. Vilchez, Narayan, Norris, O. Reimer, Ohno, Omodei, P. A. Caraveo, P. Bruel, P. D. Smith, P. F. Michelson, P. Fortin, P. Fusco, P. Giommi, P. L. Nolan, P. Lubrano, P. M. Saz Parkinson, P. Mészáros, P. N. Bhat, P. S. Drell, P. Spinelli, P. Wang, R. A. Cameron, R. Bellazzini, R. Claus, R. D. Blandford, R. Dubois, R. E. Hughes, R. H. Haynes, R. M. Kippen, R. Preece, R. Rando, R. Yamazaki, Rosswog, Ruffert, S. Buson, S. Carrigan, S. Ciprini, S. Cutini, S. Funk, S. Germani, S. Guiriec, S. J. Fegan, S. McBreen, S. McGlynn, S. Murgia, S. Rainò, S. Razzaque, S. Ritz, S. W. Digel, T. A. Porter, T. Glanzman, T. H. Burnett, T. Kamae, T. L. Schalk, T. L. Usher, T. Mizuno, T. Nakamori, T. Ohsugi, T. Reposeur, T. Tanaka, T. Ylinen, V. Chaplin, V. Connaughton, V. Pelassa, V. Vasileiou, V. Vitale, W. B. Atwood, W. B. Focke, W. Mitthumsiri, W. N. Johnson, W. S. Paciesas, X. F. Wu, Y. Fukazawa, Y. Hanabata, Y. Uchiyama, Zhang, Ö. Çelik   +237 more
core   +3 more sources

Dark Matter Signals in the gamma-ray sky

EPJ Web of Conferences, 2014
Detection of gamma rays and cosmic rays from the annihilation or decay of dark matter particles is a promising method for identifying dark matter, understanding its intrinsic properties, and mapping its distribution in the universe.
Morselli Aldo
doaj   +1 more source

Blazar jet physics in the age of Fermi

, 2010
The impact of the Fermi Gamma-ray Space Telescope on blazar research is reviewed. This includes a brief description of the Fermi Large Area Telescope, a summary of the various classes of extragalactic sources found in the First Large Area Telescope AGN ...
Dermer, Charles D.
core   +1 more source

Quantification of Perturbation to the Daytime Lower Ionosphere From a Gamma Ray Burst Using ELF Remote Sensing

Geophysical Research Letters, Volume 52, Issue 22, 28 November 2025.
Abstract On 9 October 2022, a powerful gamma ray burst (GRB), GRB221009A, caused significant changes in the electron density of the lower ionosphere, as evidenced by VLF (3–30 kHz) radio wave observations. However, GRB221009A did not yield any observable signatures at the Schumann resonances (∼8, ∼14 Hz), which are also sensitive to the lower ...
M. Gołkowski, Z. Nieckarz, J. Mlynarczyk, M. Ostrowski, J. Kubisz, A. Michalec, J. Lichtenberger, A. Klekociuk, P. Nicholson   +8 more
wiley   +1 more source

Upper limit on the axion-photon coupling from Markarian 421

Physics Letters B
Markarian421 is a well-known nearby BL Lac blazar at the redshift z=0.031. Many previous works were investigated to constrain the axion-photon coupling from its TeV gamma-ray observations, showing the upper limit on the coupling constant gaγ≲2.0×10−11GeV−
Hai-Jun Li, Wei Chao, Yu-Feng Zhou
doaj   +1 more source

Relativistic Jets in Gamma-Ray-Emitting Narrow-Line Seyfert 1 Galaxies

Galaxies, 2019
Before the launch of the Fermi Gamma-ray Space Telescope satellite only two classes of active galactic nuclei (AGN) were known to generate relativistic jets and thus to emit up to the γ -ray energy range: blazars and radio galaxies, both hosted
Filippo D’Ammando
doaj   +1 more source

On the Gamma-Ray Emission of the Andromeda Galaxy M31

The Astrophysical Journal Letters, 2023
Using the γ -ray data obtained with the Large Area Telescope on board the Fermi Gamma-ray Space Telescope (Fermi) for ∼14 yr, we examine the high-energy emission emanating from the center of the Andromeda galaxy M31.
Yi Xing, Zhongxiang Wang, Dong Zheng, Jie Li   +3 more
doaj   +1 more source

Pre-burst events of gamma-ray bursts with light speed variation

Physics Letters B, 2021
Previous researches on high-energy photon events from gamma-ray bursts (GRBs) suggest a light speed variation v(E)=c(1−E/ELV) with ELV=3.6×1017 GeV, together with a pre-burst scenario that hight-energy photons come out about 10 seconds earlier than low ...
Jie Zhu, Bo-Qiang Ma
doaj   +1 more source