Results 81 to 90 of about 11,249 (249)

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, Zhongxiang Wang, Xiao Zhang, Yang Chen, Yi Xing   +4 more
doaj   +1 more source

Origin of the Positron Excess with Pulsar Wind Nebulae

Journal of Physics: Conference Series, 2022
AMS-02 has been measured with unprecedented precision data for the positron flux. These data show that there is an excess of cosmic positrons detected for energies above 10 GeV with respect to the well known secondary production which is due to the ...
H. Xia
semanticscholar   +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

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, Wei Zheng, Yidi Wang, Lu Zhang, Yuming Qin   +4 more
wiley   +1 more source

A Dynamical Model for the Evolution of a Pulsar Wind Nebula inside a Non-Radiative Supernova Remnant

, 2009
A pulsar wind nebula inside a supernova remnant provides a unique insight into the properties of the central neutron star, the relativistic wind powered by its loss of rotational energy, its progenitor supernova, and the surrounding environment.
Aharonian, Aharonian, Arons, Bandiera, Blondin, Blondin, Büsching, Chandrasekhar, Chevalier, Chevalier, Frail, Gelfand, Green, Joseph D. Gelfand, Jun, Kaplan, Kothes, LaMassa, Malyshev, Milne, Mori, Pacholczyk, Patrick O. Slane, Rees, Rybicki, Sedov, Sefako, Shapiro, Slane, Slane, Spitkovsky, Stone, Temim, Temim, Truelove, van der Swaluw, Venter, Weiqun Zhang, Weisskopf, Woltjer   +39 more
core   +1 more source

X-ray morphology of pulsar wind nebulae: the effect of local medium motion

ASTRONOMY AT THE EPOCH OF MULTIMESSENGER STUDIES. Proceedings of the VAK-2021 conference, Aug 23–28, 2021, 2022
The effect of the relative motion of the pulsar wind nebula (PWN) and the local medium on the PWN X-ray morphology isstudied using relativistic MHD modelling.
K. Levenfish, G. Ponomaryov, A. Petrov
semanticscholar   +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, Wallace Tucker, Anselmo Meregaglia   +2 more
wiley   +1 more source

Bow-shock Pulsar Wind Nebulae Passing Through Density Discontinuities

, 2016
Bow-shock pulsar wind nebulae are a subset of pulsar wind nebulae that form when the pulsar has high velocity due to the natal kick during the supernova explosion.
Heinz, Sebastian, Yoon, Doosoo
core   +1 more source

Magnetic dissipation in the Crab Nebula [PDF]

, 2012
Magnetic dissipation is frequently invoked as a way of powering the observed emission of relativistic flows in Gamma Ray Bursts and Active Galactic Nuclei.
Lyubarsky, S. S. Komissarov
core   +2 more sources

Multimessengers from Core‐Collapse Supernovae: Multidimensionality as a Key to Bridge Theory and Observation

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, Tomoya Takiwaki, Yudai Suwa, Wakana Iwakami Nakano, Shio Kawagoe, Youhei Masada, Shin-ichiro Fujimoto, Andrew Fruchter   +7 more
wiley   +1 more source