Results 11 to 20 of about 638,354 (389)

Unveiling the nature of the unidentified gamma-ray sources III: gamma-ray blazar-like counterparts at low radio frequencies [PDF]

open access: yes, 2013
About one third of the gamma-ray sources listed in the second Fermi LAT catalog (2FGL) have no firmly established counterpart at lower energies so being classified as unidentified gamma-ray sources (UGSs). Here we propose a new approach to find candidate
D'Abrusco, R.   +7 more
core   +7 more sources

Gamma-Ray Bursts as Neutrino Sources [PDF]

open access: yes, 2017
13 pages, review to appear in "Neutrino Astronomy- Current status, future prospects", Eds. T. Gaisser \& A. Karle (World Scientific)
Peter Mészáros
openaire   +5 more sources

On the Potential of Bright, Young Pulsars to Power Ultrahigh Gamma-Ray Sources [PDF]

open access: yesAstrophysical Journal Letters, 2022
The recent discovery of a new population of ultrahigh-energy gamma-ray sources with spectra extending beyond 100 TeV revealed the presence of Galactic PeVatrons—cosmic-ray factories accelerating particles to PeV energies.
E. de Oña Wilhelmi   +3 more
semanticscholar   +1 more source

3HWC: The Third HAWC Catalog of Very-high-energy Gamma-Ray Sources [PDF]

open access: yesAstrophysical Journal, 2020
We present a new catalog of TeV gamma-ray sources using 1523 days of data from the High-Altitude Water Cherenkov (HAWC) Observatory. The catalog represents the most sensitive survey of the northern gamma-ray sky at energies above several TeV, with three ...
A. Albert   +106 more
semanticscholar   +1 more source

Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth [PDF]

open access: yesScience, 2017
Exotic origin for cosmic positrons Several cosmic-ray detectors have found more positrons arriving at Earth than expected. Some researchers interpret this as a signature of exotic physics, such as the annihilation of dark matter particles.
A. Abeysekara   +115 more
semanticscholar   +1 more source

Classification of New X-Ray Counterparts for Fermi Unassociated Gamma-Ray Sources Using the Swift X-Ray Telescope [PDF]

open access: yesAstrophysical Journal, 2019
Approximately one-third of the gamma-ray sources in the third Fermi-LAT catalog are unidentified or unassociated with objects at other wavelengths. Observations with the X-Ray Telescope on the Neil Gehrels Swift Observatory (Swift-XRT) have yielded ...
A. Kaur   +4 more
semanticscholar   +1 more source

Improved limits on Lorentz invariance violation from astrophysical gamma-ray sources [PDF]

open access: yesPhysical Review D, 2018
Lorentz invariance (LI) has a central role in science and its violation (LIV) at some high-energy scale has been related to possible solutions for several of the most intriguing puzzles in nature such as dark matter, dark energy, cosmic rays generation ...
R. Lang, H. Mart'inez-Huerta, V. Souza
semanticscholar   +1 more source

VERITAS and Fermi-LAT Observations of TeV Gamma-Ray Sources Discovered by HAWC in the 2HWC Catalog [PDF]

open access: yesAstrophysical Journal, 2018
The High Altitude Water Cherenkov (HAWC) collaboration recently published their 2HWC catalog, listing 39 very high energy (VHE; >100 GeV) gamma-ray sources based on 507 days of observation. Among these, 19 sources are not associated with previously known
A. Abeysekara   +278 more
semanticscholar   +1 more source

Extending the event-weighted pulsation search to very faint gamma-ray sources [PDF]

open access: yesAstronomy & Astrophysics, 2018
Context. Because of the relatively broad angular resolution of current gamma-ray instruments in the MeV–GeV energy range, the photons of a given source are mixed with those coming from nearby sources or diffuse background. This source confusion seriously
P. Bruel
semanticscholar   +1 more source

Variability of EGRET Gamma‐Ray Sources [PDF]

open access: yesThe 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/
Peter F. Michelson   +3 more
openaire   +3 more sources

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