Results 81 to 90 of about 59,762 (195)

Irregularly Sampled Time Series Interpolation for Detailed Binary Evolution Simulations

The Astrophysical Journal
Modeling of large populations of binary stellar systems is an integral part of many areas of astrophysics, from radio pulsars and supernovae to X-ray binaries, gamma-ray bursts, and gravitational-wave mergers.
Philipp M. Srivastava, Ugur Demir, Aggelos Katsaggelos, Vicky Kalogera, Shamal Lalvani, Elizabeth Teng, Tassos Fragos, Jeff J. Andrews, Simone S. Bavera, Max Briel, Seth Gossage, Konstantinos Kovlakas, Matthias U. Kruckow, Camille Liotine, Kyle A. Rocha, Meng Sun, Zepei Xing, Emmanouil Zapartas   +17 more
doaj   +1 more source

A Two-hump Spectrum in the Prompt Emission of GRB 240825A

The Astrophysical Journal Letters
An extra hard spectral component that extends to GeV energies, in additional to the typical sub-MeV Band component, appears in several gamma-ray bursts (GRBs) detected by the Fermi Large Area Telescope.
Hai-Ming Zhang, Zi-Qi Wang, Cui-Yuan Dai, Yi-Yun Huang, Wen-Qiang Liang, Ruo-Yu Liu, En-Wei Liang, Xiang-Yu Wang   +7 more
doaj   +1 more source

Gamma ray production cross sections in proton induced reactions on natural Mg, Si and Fe targets over the proton energy range 30 up to 66 MeV

, 2015
Gamma-ray excitation functions have been measured for 30, 42, 54 and 66 MeV proton beams accelerated onto C + O (Mylar), Mg, Si, and Fe targets of astrophysical interest at the separate-sector cyclotron of iThemba LABS in Somerset West (Cape Town, South ...
Belhout, A., Benhabiles, H., Bucher, T. D., Chafa, A., Damache, S., de Sereville, N., Debabi, M., Deloncle, I., Easton, J. L., Hamadache, C., Hammache, F., Jones, P., Kheswa, B. V., Khumalo, N., Kiener, J., Lamula, T., Lawrie, E., Lawrie, J. J., Majola, S. T. H., Moussa, D., Nchodu, R., Ndayishimye, J., Negi, D., Noncolela, S. P., Ouichaoui, S., Papka, P., Sharpey-Schafer, J. F., Shirinda, O., Tatischeff, V., Wiedeking, M., Wyngaardt, S., Yahia-Chérif, W.   +31 more
core   +1 more source

Can Gamma-Ray Burst Empirical Correlations Be Used for Population Studies?

The Astrophysical Journal
Only a small fraction of gamma-ray bursts (GRBs) have independent redshift measurements, which are essential for understanding their intrinsic properties.
Emre S. Yorgancioglu, Yun-Fei Du, Shu-Xu Yi, Shuang-Nan Zhang   +3 more
doaj   +1 more source

Stellar-wind-blown Bubbles as Environments for Late-time Rebrightening of Gamma-ray Burst Afterglows

The Astrophysical Journal Letters
We present multiwavelength afterglow fitting results for three events that exhibit late afterglow rebrightening behavior: EP240414a ( z = 0.401), GRB 240529A ( z = 2.695), and GRB 240218A ( z = 6.782), which span a broad range of redshifts, from the ...
Jia Ren, Xiao-Yan Li, Yun Wang, Lu-Lu Zhang, Da-Ming Wei, Zi-Gao Dai, Zhi-Ping Jin, Da-Bin Lin   +7 more
doaj   +1 more source

Investigating Polarization Signatures from GRB Models

The Astrophysical Journal
There is still much debate around the inner workings of the gamma-ray-burst (GRB) prompt emission phase, with many questions still left unanswered. Polarization signatures offer a promising new avenue for discriminating between the various GRB prompt ...
Pieter van der Merwe, Markus Böttcher
doaj   +1 more source

X-ray Technologies for Astrophysics Missions Supported by the Italian Space Agency

Condensed Matter
The Italian Space Agency plays a key role in the fulfillment of space missions, contributing to the scientific, technological and economic progress in Italy.
Marco Miliucci, Angela Volpe, Sergio Fabiani, Marco Feroci, Luca Latronico, Claudio Macculi, Luigi Piro, Matteo D’Andrea, Flavio Gatti, Simonetta Puccetti, Paolo Soffitta, Elisabetta Cavazzuti   +11 more
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High energy from space [PDF]

The following subject areas are covered: (1) important scientific problems for high energy astrophysics (stellar activity, the interstellar medium in galaxies, supernovae and endpoints of stellar evolution, nucleosynthesis, relativistic plasmas and ...
Canizares, Claude, Catura, Richard C., Clark, George W., Fichtel, Carl E., Friedman, Herbert, Giacconi, Riccardo, Grindlay, Jonathan E., Helfand, David J., Holt, Stephen S., Margon, Bruce   +9 more
core   +1 more source

Radiation Spectrum of the Photospheric Emission for a Turbulent Relativistic Jet

The Astrophysical Journal
The prompt gamma rays of gamma-ray bursts (GRBs) may originate from the photosphere of a relativistic jet. However, only a few GRBs have been observed with evident blackbody-like emission, for example, GRB 090902B.
Guo-Yu Li, Da-Bin Lin, Zhi-Lin Chen, En-Wei Liang   +3 more
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Ion–Electron Instabilities in the Precursors of Weakly Magnetized, Transrelativistic Shocks

The Astrophysical Journal
Collisionless shocks are known to induce turbulence via upstream ion reflection within the precursor region. This study elucidates the properties of electrostatic and electromagnetic instabilities, exploring their role over the transrelativistic range ...
Théo Abounnasr
doaj   +1 more source