Results 21 to 30 of about 793 (152)
Neutral Atmospheric Density Measurement Using Insight-HXMT Data by the Earth Occultation Technique
The Astrophysical Journal Supplement Series, 2022 The Earth occultation technique has broad applications in both astronomy and atmospheric density measurements. We construct the background model during the occultation of the Crab Nebula observed by the Insight-Hard X-ray Modulation Telescope (Insight ...
Wang-Chen Xue +14 more
doaj +1 more source
Impact of Cosmic‐Ray Physics on Dark Matter Indirect Searches
Advances in High Energy Physics, Volume 2018, Issue 1, 2018., 2018 The quest for the elusive dark matter (DM) that permeates the Universe (and in general the search for signatures of physics beyond the Standard Model at astronomical scales) provides a unique opportunity and a tough challenge to the high energy astrophysics community.
Daniele Gaggero +2 more
wiley +1 more source
Fermi-LAT Detection of the Supernova Remnant G312.4-0.4 in the Vicinity of 4FGL J1409.1-6121e
The Astrophysical Journal, 2023 Gamma-ray emission provides constraints on the nonthermal radiation processes at play in astrophysical particle accelerators. This allows both the nature of accelerated particles and the maximum energy that they can reach to be determined.
Pauline Chambery +4 more
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The Observer’s Guide to the Gamma‐Ray Burst Supernova Connection
Advances in Astronomy, Volume 2017, Issue 1, 2017., 2017 We present a detailed report of the connection between long‐duration gamma‐ray bursts (GRBs) and their accompanying supernovae (SNe). The discussion presented here places emphasis on how observations, and the modelling of observations, have constrained what we know about GRB‐SNe.
Zach Cano +4 more
wiley +1 more source
Diverse Features of the Multiwavelength Afterglows of Gamma‐Ray Bursts: Natural or Special?
Advances in Astronomy, Volume 2016, Issue 1, 2016., 2016 The detection of optical rebrightenings and X‐ray plateaus in the afterglows of gamma‐ray bursts (GRBs) challenges the generic external shock model. Recently, we have developed a numerical method to calculate the dynamics of the system consisting of a forward shock and a reverse shock.
J. J. Geng, Y. F. Huang, WeiKang Zheng
wiley +1 more source
4FGL J1844.4–0306: High-energy Emission Likely from the Supernova Remnant G29.37 + 0.1
The Astrophysical Journal, 2023 Very-high-energy (VHE) observations have revealed approximately 100 TeV sources in our Galaxy, and a significant fraction of them are under investigation to understand their origin. We report our study of one of them, HESS J1844−030.
Dong Zheng +4 more
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X‐Ray Pulsar Profile Recovery Based on Tracking‐Differentiator
Mathematical Problems in Engineering, Volume 2016, Issue 1, 2016., 2016 The profile recovery is an important work in X‐ray pulsar‐based navigation. It is a key step for the analysis on the pulsar signal’s characteristic and the computing of time of arrival (TOA). This paper makes an argument for an algorithm based on the tracking‐differentiator (TD) to recover the profile from the low Signal‐to‐Noise Ratio (SNR) signals ...
Dapeng Zhang +4 more
wiley +1 more source
Astronomical Signatures of Dark Matter
Advances in High Energy Physics, Volume 2014, Issue 1, 2014., 2014 Several independent astronomical observations in different wavelength bands reveal the existence of much larger quantities of matter than what we would deduce from assuming a solar mass to light ratio. They are very high velocities of individual galaxies within clusters of galaxies, higher than expected rotation rates of stars in the outer regions of ...
Paul Gorenstein +2 more
wiley +1 more source
Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012 Core‐collapse supernovae are dramatic explosions marking the catastrophic end of massive stars. The only means to get direct information about the supernova engine is from observations of neutrinos emitted by the forming neutron star, and through gravitational waves which are produced when the hydrodynamic flow or the neutrino flux is not perfectly ...
Kei Kotake +7 more
wiley +1 more source
Pulsar‐Driven Jets in Supernovae, Gamma‐Ray Bursts, and the Universe
Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012 The bipolarity of Supernova 1987A can be understood through its very early light curve from the CTIO 0.4 m telescope and IUE FES and following speckle observations of the “Mystery Spot”. These indicate a beam/jet of light/particles, with initial collimation factors >104 and velocities >0.95 c, involving up to 10−5 M⊙ interacting with circumstellar ...
John Middleditch +1 more
wiley +1 more source