Results 11 to 20 of about 654,178 (344)

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

open access: greenAstrophysical 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. U. Abeysekara   +99 more
openalex   +3 more sources

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

open access: bronze, 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 T Cromartie   +8 more
openalex   +3 more sources

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

The First LHAASO Catalog of Gamma-Ray Sources [PDF]

open access: yesThe Astrophysical Journal Supplement Series, 2023
We present the first catalog of very-high-energy and ultra-high-energy gamma-ray sources detected by the Large High Altitude Air Shower Observatory. The catalog was compiled using 508 days of data collected by the Water Cherenkov Detector Array from 2021
Zhen Cao   +280 more
doaj   +2 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

The TRAPUM L-band survey for pulsars in Fermi-LAT gamma-ray sources [PDF]

open access: yes, 2022
More than 100 millisecond pulsars (MSPs) have been discovered in radio observations of gamma-ray sources detected by the Fermi Large Area Telescope (LAT), but hundreds of pulsar-like sources remain unidentified.
C. Clark   +37 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

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