Results 31 to 40 of about 712,854 (335)

The Second Catalog of Flaring Gamma-Ray Sources from the Fermi All-sky Variability Analysis [PDF]

, 2016
We present the second catalog of flaring gamma-ray sources (2FAV) detected with the Fermi All-sky Variability Analysis (FAVA), a tool that blindly searches for transients over the entire sky observed by the Large Area Telescope (LAT) on board the Fermi ...
S. Abdollahi, M. Ackermann, M. Ajello, A. Albert, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, J. González, R. Bellazzini, E. Bissaldi, R. Blandford, E. Bloom, R. Bonino, E. Bottacini, J. Bregeon, P. Bruel, R. Buehler, S. Buson, R. Cameron, M. Caragiulo, P. Caraveo, E. Cavazzuti, C. Cecchi, A. Chekhtman, C. Cheung, G. Chiaro, S. Ciprini, J. Conrad, D. Costantin, F. Costanza, S. Cutini, F. D’Ammando, F. Palma, A. Desai, R. Desiante, S. Digel, N. D. Lalla, M. D. Mauro, L. Venere, B. Donaggio, P. Drell, C. Favuzzi, S. Fegan, E. Ferrara, W. Focke, A. Franckowiak, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, M. Giomi, F. Giordano, M. Giroletti, T. Glanzman, D. Green, I. Grenier, J. Grove, L. Guillemot, S. Guiriec, E. Hays, D. Horan, T. Jogler, G. J'ohannesson, A. Johnson, D. Kocevski, M. Kuss, G. Mura, S. Larsson, L. Latronico, J. Li, F. Longo, F. Loparco, M. Lovellette, P. Lubrano, J. Magill, S. Maldera, A. Manfreda, M. Mayer, M. Mazziotta, P. Michelson, W. Mitthumsiri, T. Mizuno, M. Monzani, A. Morselli, I. Moskalenko, M. Negro, É. Nuss, T. Ohsugi, N. Omodei, M. Orienti, E. Orlando, V. Paliya, D. Paneque, J. Perkins, M. Persic, M. Pesce-Rollins, V. Petrosian, F. Piron, T. Porter, G. Principe, S. Rainò, R. Rando, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, C. Sgro’, D. Simone, E. Siskind, F. Spada, G. Spandre, P. Spinelli, L. Stawarz, D. Suson, M. Takahashi, K. Tanaka, J. Thayer, D. Thompson, D. Torres, E. Torresi, G. Tosti, E. Troja, G. Vianello, K. Wood   +126 more
semanticscholar   +1 more source

Microquasars and Gamma-ray Sources [PDF]

Chinese Journal of Astronomy and Astrophysics, 2005
Microquasars are X-ray binary systems with non-thermal radio emission originated in jet-like features. They are attractive sites for gamma-ray production, since relativistic particles in the jet should traverse locally strong both photon and matter fields.
openaire   +3 more sources

SIX NEW MILLISECOND PULSARS FROM ARECIBO SEARCHES OF FERMI GAMMA-RAY SOURCES [PDF]

, 2016
We have discovered six radio millisecond pulsars (MSPs) in a search with the Arecibo telescope of 34 unidentified gamma-ray sources from the Fermi Large Area Telescope (LAT) four year point source catalog.
H. Cromartie, F. Camilo, M. Kerr, J. Deneva, S. Ransom, P. Ray, E. Ferrara, P. Michelson, K. Wood   +8 more
semanticscholar   +1 more source

Fermi establishes classical novae as a distinct class of gamma-ray sources [PDF]

Science, 2014
Gamma-ray novas may be garden variety When astronomers detected gamma rays from the nova V407 Cyg, an explosive mass transfer from a red giant onto a white dwarf, they found it surprising enough.
The Fermi Collaboration
semanticscholar   +1 more source

Do gamma-ray burst sources repeat? [PDF]

Monthly Notices of the Royal Astronomical Society, 1993
Following the discovery by Quashnock and Lamb (1993) of an apparent excess of $ $-ray burst pairs with small angular separations, we reanalyze the angular distribution of the bursts in the BATSE catalogue. We find that in addition to an excess of close pairs, there is also a comparable excess of antipodal bursts, i.e pairs of bursts separated by about
Narayan, Ramesh, Piran, Tsvi
openaire   +3 more sources

Variability of EGRET Gamma‐Ray Sources [PDF]

The Astrophysical Journal, 2003
Accepted by ApJ. 13 pages, 3 figures, 2 tables. Machine-readable copies of Table 1 are at http://giants.stanford.edu/~pln/vartbl1/
Nolan, P. L., Tompkins, W. F., Grenier, I. A., Michelson, P. F.   +3 more
openaire   +2 more sources

PARKES RADIO SEARCHES OF FERMI GAMMA-RAY SOURCES AND MILLISECOND PULSAR DISCOVERIES [PDF]

, 2015
In a search with the Parkes radio telescope of 56 unidentified Fermi-Large Area Telescope (LAT) gamma-ray sources, we have detected 11 millisecond pulsars (MSPs), 10 of them discoveries, of which five were reported by Kerr et al.
F. Camilo, M. Kerr, P. Ray, S. Ransom, J. Sarkissian, H. Cromartie, S. Johnston, J. Reynolds, M. T. Wolff, P. Freire, B. Bhattacharyya, E. Ferrara, Michael J. Keith, P. Michelson, P. S. Parkinson, K. Wood   +15 more
semanticscholar   +1 more source

Prompt gamma-ray methods for industrial process evaluation: A simulation study

Nukleonika, 2022
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 ...
Mohammed Mohammed Siddig H., Alhawsawi Abdulsalam, Aljohani M. S., Damoom Mohammed M., Banoqitah Essam M., Elmoujarkach Ezzat   +5 more
doaj   +1 more source

Very High Energy Gamma-Ray Observations of the Galactic Centre Region [PDF]

, 2008
Recent progress in pushing the sensitivity of the Imaging Atmospheric Cherenkov Technique into the 10 mCrab regime has enabled first sensitive observations of the innermost few 100 pc of the Milky Way in Very High Energy (VHE; >100 GeV) gamma rays. These
Christopher van Eldik, Felix A. Aharonian, Frank Rieger, Werner Hofmann   +3 more
core   +2 more sources

BLAZARS AS ULTRA-HIGH-ENERGY COSMIC-RAY SOURCES: IMPLICATIONS FOR TeV GAMMA-RAY OBSERVATIONS [PDF]

, 2011
The spectra of BL Lac objects and Fanaroff–Riley I radio galaxies are commonly explained by the one-zone leptonic synchrotron self-Compton (SSC) model. Spectral modeling of correlated multiwavelength data gives the comoving magnetic field strength, the ...
K. Murase, C. Dermer, H. Takami, G. Migliori   +3 more
semanticscholar   +1 more source