Results 31 to 40 of about 20,416 (210)

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

Investigating the region of 3C 397 in High Energy Gamma rays [PDF]

, 2017
We investigate the supernova remnant (SNR) 3C 397 and its neighboring pulsar PSR J1906+0722 in high energy gamma rays by using nearly six years of archival data of {\it Large Area Telescope} on board {\it Fermi Gamma Ray Space Telescope} (Fermi-LAT). The
Bhattacharjee, Pooja, Ergin, Tulun, Joarder, Partha S., Majumdar, Pratik, Saha, Lab   +4 more
core   +2 more sources

High Energy Observational Investigations of Supernova Remnants and their Interactions with Surroundings [PDF]

Journal of Astronomy and Space Sciences, 2013
Here we review the effort of Fermi Asian Network (FAN) in exploring the supernova remnants (SNRs) with state-of-art high energy observatories, including Fermi Gamma-ray Space Telescope and Chandra X-ray Observatory, in the period of 2011- 2012 ...
Chung-Yue Hui
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

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

FERMI GAMMA-RAY SPACE TELESCOPEOBSERVATIONS OF GAMMA-RAY OUTBURSTS FROM 3C 454.3 IN 2009 DECEMBER AND 2010 APRIL [PDF]

The Astrophysical Journal, 2010
The flat spectrum radio quasar 3C 454.3 underwent an extraordinary outburst in 2009 December when it became the brightest gamma-ray source in the sky for over 1 week. Its daily flux measured with the Fermi-Large Area Telescope at photon energiesE > 100 MeV reached F-100 = 22 +/- 1 x 10(6) photon cm(-2) s(-1), representing the highest daily flux of any ...
Ackermann, M., Ajello, M., Baldini, L., Ballet, Jean, Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bonamente, E., Borgland, A. W., Bregeon, J., Brigida, M., Bruel, Pascal, Buehler, R., Burnett, T. H., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Carrigan, S., Casandjian, J. M., Cavazzuti, E., Cecchi, C., Celik, O., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Corbel, S., Cutini, S., d'Ammando, F., Dermer, C. D., de Angelis, A., de Palma, F., Digel, S. W., Do Couto e Silva, E., Drell, P. S., Dubois, R., Dumora, D., Escande, L., Favuzzi, C., J. Fegan, S., Ferrara, E. C., Fuhrmann, L., Fukazawa, Y., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giebels, B., Giglietto, N., Giommi, P., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Grenier, I. A., Grove, J. E., Guiriec, S., Hadasch, D., Hayashida, M., Hays, E., Jóhannesson, G., Johnson, A. S., Johnson, W. N., Kamae, T., Katagiri, H., Kataoka, J., Knödlseder, Jürgen, Kuss, M., Lande, J., Larsson, S., Latronico, L., Lee, S.-H., Llena Garde, M., Longo, F., Loparco, F., Lott, B., Lubrano, P., Madejski, G. M., Makeev, A., Marchili, N., Mazziotta, M. N., Mcenery, J. E., Mehault, J., Michelson, P. F., Mizuno, T., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nakamori, T., Nalewajko, K., Naumann-Godo, M., Nolan, P. L., Norris, J. P., Nuss, E., Ohsugi, T., Okumura, A., Omodei, N., Orlando, E., Ormes, J. F., Pelassa, V., Pepe, M., Pesce-Rollins, M., Piron, F., Porter, T. A., Rainò, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Reyes, L. C., Ripken, J., Ritz, S., Roth, M., Sadrozinski, H. F.-W., Sanchez, D., Sander, A., Scargle, J. D., Sgrò, C., Sikora, M., Siskind, E. J., Spandre, G., Spinelli, P., Strickman, M. S., Suson, D. J., Takahashi, H., Takahashi, T., Tanaka, T., Tanaka, Y., Thayer, J. B., Thayer, J. G., Thompson, D. J., Tibaldo, L., Torres, D. F., Tosti, G., Tramacere, A., Usher, T. L., Vandenbroucke, J., Vilchez, N., Vitale, V., Waite, A. P., Wang, P., Wehrle, A. E., Winer, B. L., Yang, Z., Ylinen, T., Ziegler, M.   +154 more
openaire   +8 more sources

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

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