Results 41 to 50 of about 59,762 (195)
The Astrophysical Journal, 2023 HESS J1702-420 is a multi-TeV gamma-ray source with an unusual energy-dependent morphology. The recent H.E.S.S. observations suggest that the emission is well described by a combination of the point-like HESS J1702-420A (dominating at highest energies ...
Felix Aharonian +2 more
doaj +1 more source
Astrophysical Gamma Ray Emission Lines [PDF]
, 1995 Plain TEX file, 28 pages with 14 figures available upon e-mail request to ramaty@pair.lheavx.gsfc.nasa.gov. In press, 1995, in The Analysis of Emission Lines, eds. R. E. Williams and M. Livio, (Cambridge: Cambridge Univ. Press), based on an invited talk at the Analysis of Emission Lines Conference, Space Telescope Science Institute, May 1994.
Ramaty, R., Lingenfelter, R. E.
openaire +2 more sources
SensorsThe domain of gamma-ray imaging necessitates technological advancements to surmount the challenge of energy-selective imaging. Conventional systems are constrained in their dynamic focus on specific energy ranges, a capability imperative for ...
Changqing Zhang +8 more
doaj +1 more source
A Neutron Capture Explanation for the 10 MeV Emission Line Seen in GRB 221009A
The Astrophysical Journal LettersThe brightest ever gamma-ray burst (GRB) 221009A displays a significant emission line component around 10 MeV. As the GRB central engine is neutron rich, we propose that the emission line could be originally due to the 2.223 MeV gamma rays following ...
Jiahuan Zhu, Hua Feng, Tong Liu
doaj +1 more source
The Astrophysical Journal Letters, 2023 Recently, LHAASO reported the detection of the brightest-of-all-time GRB 221009A, revealing the early onset of a TeV afterglow. We analyze the spectral evolution of the X-ray/gamma-ray emission of GRB 221009A measured by the Fermi Gamma-ray Burst Monitor
Hai-Ming Zhang +3 more
doaj +1 more source
Fermi Constraints on the Ejecta Speed and Prompt Emission Region of the Distant GRB 220101A
The Astrophysical Journal, 2023 At redshift z = 4.618, GRB 220101A is the most distant gamma-ray burst (GRB) detected by Fermi/LAT to date. It is also a very energetic event, with an equivalent isotropic energy of 3.6 × 10 ^54 erg. We jointly analyzed the Fermi/GBM and LAT observations
Lorenzo Scotton +4 more
doaj +1 more source
A multi-wavelength pipeline for pulsar searches [PDF]
, 2019 Pulsar studies in the recent years have shown, more than others, to have benefited from a multi-wavelength approach. The INAF - Astronomical Observatory in Cagliari (INAF-OAC) is a growing facility with a young group devoted to pulsar and fast transients
Atzeni, Giuseppe +9 more
core +2 more sources
, 1996 Invited review at the Frascati Workshop 2007, Vulcano, Italy, May 28 - June 2 on "Multifrequency Behaviour of High Energy Cosmic Sources". ChJAA, in press.
openaire +3 more sources
The Possibility of Modeling the Very High Energy Afterglow of GRB 221009A in a Wind Environment
The Astrophysical Journal, 2023 In this paper, we model the dynamics and radiation physics of the rarity event GRB 221009A afterglow in detail. By introducing a top-hat jet that propagates in an environment dominated by stellar winds, we explain the publicly available observations of ...
Jia Ren +3 more
doaj +1 more source
Calibration of the CAT Telescope [PDF]
, 1999 Due to the lack of test-beams in ground-based gamma-ray astronomy, detector calibration has been a major challenge in this field. However, with the use of Cherenkov ring-images due to cosmic-ray muons and of strong gamma-ray signals, the CAT telescope ...
Piron, Frederic
core +3 more sources