Results 51 to 60 of about 20,211 (230)

Probing photon-ALP oscillations from the flat spectrum radio quasar 4C+21.35

Physics Letters B, 2022
Flat spectrum radio quasar (FSRQ) is the most luminous blazar at the GeV energies. In this paper, we probe the photon-axion-like particle (ALP) oscillation effect on the latest very-high-energy (VHE) γ-ray observations of the FSRQ 4C+21.35 (PKS 1222+216).
Hai-Jun Li
doaj   +1 more source

MeV gamma-ray constraints for light dark matter from semi-annihilation

Physics Letters B, 2023
Exploring the realm of Dark Matter research, Light DM, which has a mass in the range of 1 MeV to 1 GeV, is a fascinating topic both theoretically and experimentally.
Jun Guo, Lei Wu, Bin Zhu
doaj   +1 more source

A Combined Radio Multi-Survey Catalog of Fermi Unassociated Sources

The Astrophysical Journal, 2023
Approximately one-third of existing γ -ray sources identified by the Fermi Gamma-Ray Space Telescope are considered to be unassociated, with no known counterpart at other frequencies/wavelengths.
S. Bruzewski, F. K. Schinzel, G. B. Taylor   +2 more
doaj   +1 more source

Light speed variation from gamma ray bursts: criteria for low energy photons

European Physical Journal C: Particles and Fields, 2018
We examine a method to detect the light speed variation from gamma ray burst data observed by the Fermi Gamma-ray Space Telescope (FGST). We suggest new criteria to determine the characteristic time for low energy photons by the energy curve and the ...
Yue Liu, Bo-Qiang Ma
doaj   +1 more source

Spider Invasion Across the Galaxy [PDF]

Journal of Astronomy and Space Sciences, 2014
The nature of the exotic stellar corpses which reincarnate by consuming their companion is reviewed. Apart from sucking life from their partners, they are actually eating the doomed companions away by their deadly and powerful particle/radiation beams.
Chung-Yue Hui
doaj   +1 more source

Discovery of gamma-ray emission from the supernova remnant Kes 17 with Fermi Large Area Telescope [PDF]

, 2011
We report the discovery of GeV emission at the position of supernova remnant Kes 17 by using the data from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope.
Cheng, K. S., Huang, R. H. H., Hui, C. Y., Kong, A. K. H., Tam, P. H. T., Wu, E. M. H., Wu, J. H. K.   +6 more
core   +2 more sources

15 GHz Monitoring of Gamma-ray Blazars with the OVRO 40 Meter Telescope in Support of Fermi [PDF]

, 2009
We present results from the first two years of our fast-cadence 15 GHz gamma-ray blazar monitoring program, part of the F-GAMMA radio monitoring project.
Angelakis, E., Fuhrmann, L., Grainge, K., Healey, S. E., Max-Moerbeck, W., Pavlidou, V., Pearson, T. J., Readhead, A. C. S., Richards, J. L., Romani, R. W., Scargle, J. D., Shaw, M. S., Stevenson, M. A., Taylor, G. B., Zensus, J. A.   +14 more
core   +2 more sources

The VLBA-BU-BLAZAR Multi-Wavelength Monitoring Program

Galaxies, 2016
We describe a multiwavelength program of monitoring of a sample of bright γ-ray blazars, which the Boston University (BU) group has being carrying out since June 2007.
Svetlana Jorstad, Alan Marscher
doaj   +1 more source

3HWC J0631+107/LHAASO J0631+1040: A TeV Halo Powered by the Pulsar J0631+1036?

The Astrophysical Journal, 2023
PSR J0631+1036 is a middle-aged pulsar with properties similar to those of the nearby Geminga pulsar. It is bright in γ -rays, and has been noted as the only source possibly associated with the TeV source 3HWC J0631+107 (also the LHAASO J0631+1040).
Dong Zheng, Zhongxiang Wang, Yi Xing
doaj   +1 more source

Fermi Large Area Telescope Bright Gamma-ray Source List

, 2009
Following its launch in June 2008, the Fermi Gamma-ray Space Telescope (Fermi) began a sky survey in August. The Large Area Telescope (LAT) on Fermi in 3 months produced a deeper and better-resolved map of the gamma-ray sky than any previous space ...
A. A. Abdo, A. A. Moiseev, A. Bouvier, A. Brez, A. Chekhtman, A. de Angelis, A. de Luca, A. K. Harding, A. Makeev, A. Morselli, A. P. Waite, A. Reimer, A. S. Johnson, A. Sander, A. Sellerholm, A. Sierpowska-Bartosik, A. Tramacere, A. Van Etten, A. W. Borgland, A. W. Strong, A. Y. Rodriguez, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Aharonian, Albert, Atwood, B. Berenji, B. Giebels, B. L. Winer, B. Lott, B. M. Baughman, C. C. Cheung, C. Cecchi, C. D. Dermer, C. Farnier, C. Favuzzi, C. Meurer, C. Monte, C. Sgrò, C. Shrader, Cheung, Ciprini, D. A. Smith, D. Bastieri, D. Dumora, D. F. Torres, D. Gasparrini, D. Horan, D. J. Suson, D. J. Thompson, D. Kocevski, D. L. Band, D. Paneque, D. Parent, D. S. Davis, D. Sanchez, Damiani, de Ruiter, E. Bonamente, E. C. Ferrara, E. Cavazzuti, E. Charles, E. D. Bloom, E. do Couto e Silva, E. Hays, E. J. Siskind, E. Moretti, E. Nuss, E. Orlando, E. Wallace, F. de Palma, F. Gargano, F. Giordano, F. Kuehn, F. Longo, F. Loparco, F. Piron, F. Ryde, Funk, G. A. Caliandro, G. Barbiellini, G. F. Bignami, G. Godfrey, G. Jóhannesson, G. M. Madejski, G. Spandre, G. Tosti, Green, Guibert, H. F.-W. Sadrozinski, H. Katagiri, H. Tajima, H. Takahashi, Hartman, Healey, Healey, Hunter, 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. H. Panetta, J. Kataoka, J. Knödlseder, J. Lande, J. M. Casandjian, J. P. Norris, J.-L. Starck, K. Bechtol, K. S. Wood, K. Watters, Kargaltsev, L. Baldini, L. Costamante, L. Guillemot, L. Latronico, L. Poupard, L. R. Cominsky, L. S. Rochester, L. Tibaldo, Liu, M. Ackermann, M. Ajello, M. Axelsson, M. Battelino, M. Brigida, M. Dormody, M. E. Monzani, M. Frailis, M. Hayashida, M. Kerr, M. Kuss, M. L. Kocian, M. Lemoine-Goumard, M. Marelli, M. N. Lovellette, M. N. Mazziotta, M. Ohno, M. Ozaki, M. Pepe, M. Pesce-Rollins, M. Razzano, M. Roth, M. S. Shaw, M. S. Strickman, M. Ziegler, M.-H. Grondin, Manchester, N. Gehrels, N. Giglietto, N. Kawai, N. Komin, N. Omodei, N. Rea, N. Vilchez, O. Reimer, O. Tibolla, P. A. Caraveo, P. Bruel, P. D. Smith, P. F. Michelson, P. Fusco, P. Giommi, P. L. Nolan, P. Lubrano, P. M. Saz Parkinson, P. S. Drell, P. S. Ray, P. Spinelli, P. Wang, Paredes, Pittori, Porter, Protassov, R. A. Cameron, R. Bellazzini, R. C. Hartman, R. Claus, R. Corbet, R. D. Blandford, R. Dubois, R. E. Hughes, R. P. Johnson, R. Rando, R. W. Romani, Roberts, S. Ciprini, S. Cutini, S. E. Healey, S. Funk, S. Germani, S. Guiriec, S. J. Fegan, S. McGlynn, S. Murgia, S. Rainò, S. Ritz, S. W. Digel, S.-H. Lee, Sowards-Emmerd, Strong, Sutherland, T. A. Porter, T. E. Stephens, T. Glanzman, T. H. Burnett, T. J. Johnson, T. Kamae, T. L. Schalk, T. L. Usher, T. Mizuno, T. Nakamori, T. Ohsugi, T. Reposeur, T. Takahashi, T. Tanaka, T. Ylinen, Tibolla, Tramacere, V. Pelassa, V. Vitale, W. B. Atwood, W. B. Focke, W. McConville, W. Mitthumsiri, W. N. Johnson, Y. Fukazawa, Y. Hanabata, Y. Uchiyama   +252 more
core   +1 more source