Results 21 to 30 of about 6,020,151 (174)

The effect of proton damage on the X-ray spectral response of MOS CCDs for the swift X-ray telescope [PDF]

open access: yes, 2002
The effect of non-ionising energy loss(NIEL) of protons in charge-coupled devices is to displace silicon atoms and any dopant materials present from their lattice positions to form lattice defects which in turn can trap electrons [1].
Abbey, AF   +9 more
core   +1 more source

Experimental Measurements and Computer Simulation of Fission Product Gamma-Ray Spectra [PDF]

open access: yes, 1997
Airborne gamma ray spectrometry using high volume scintillation detectors, optionally in conjunction with Ge detectors, has potential for making rapid environmental measurements in response to nuclear accidents. An experimental investigation and computer
Sanderson, D.C.W.   +4 more
core   +7 more sources

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

open access: yesEuropean 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

A Combined Radio Multi-Survey Catalog of Fermi Unassociated Sources

open access: yesThe 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   +2 more
doaj   +1 more source

Spider Invasion Across the Galaxy [PDF]

open access: yesJournal 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

open access: yesGalaxies, 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

Solar System Gamma Ray observations using Fermi‐LAT detector

open access: yes, 2009
The Fermi Gamma‐ray Space Telescope, launched in June 2008, is an international space mission dedicated to the study of the high‐energy gamma rays from the Universe.
Fermi Collaboration, Nicola Giglietto
core   +1 more source

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

open access: yesThe 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

Jet Physics of Accreting Super-Massive Black Holes in the Era of the Fermi Gamma-ray Space Telescope

open access: yesFrontiers in Astronomy and Space Sciences, 2017
The Fermi Gamma-ray Space Telescope with its main instrument on-board, the Large Area Telescope (LAT), opened a new era in the study of high-energy emission from Active Galactic Nuclei (AGN).
Filippo D'Ammando, Filippo D'Ammando
doaj   +1 more source

Progress in Multi-wavelength and Multi-Messenger Observations of Blazars and Theoretical Challenges

open access: yesGalaxies, 2019
This review provides an overview of recent advances in multi-wavelength and multi-messenger observations of blazars, the current status of theoretical models for blazar emission, and prospects for future facilities.
Markus Böttcher
doaj   +1 more source

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