Results 11 to 20 of about 706 (178)

Why (Still) Studying Turbulence in Fluids and Plasmas?

Perspectives of Earth and Space Scientists, Volume 4, Issue 1, December 2023., 2023
Abstract Turbulence, a captivating and intricate phenomenon, continues to attract researchers across diverse scientific disciplines. Despite considerable efforts, turbulence remains a fascinating challenge and stands as one of the unsolved enigmas in classical physics.
Tommaso Alberti, Roberto Benzi, Vincenzo Carbone   +2 more
wiley   +1 more source

Long‐Term Density Trend in the Mesosphere and Lower Thermosphere From Occultations of the Crab Nebula With X‐Ray Astronomy Satellites

Journal of Geophysical Research: Space Physics, Volume 128, Issue 2, February 2023., 2023
Abstract We present long‐term density trends of the Earth's upper atmosphere at altitudes between 71 and 116 km, based on atmospheric occultations of the Crab Nebula observed with X‐ray astronomy satellites, ASCA, RXTE, Suzaku, NuSTAR, and Hitomi. The combination of the five satellites provides a time period of 28 years from 1994 to 2022.
Satoru Katsuda, Teruaki Enoto, Andrea N. Lommen, Koji Mori, Yuko Motizuki, Motoki Nakajima, Nathaniel C. Ruhl, Kosuke Sato, Gunter Stober, Makoto S. Tashiro, Yukikatsu Terada, Kent S. Wood   +11 more
wiley   +1 more source

A search for runaway stars in 12 Galactic supernova remnants

Astronomische Nachrichten, Volume 342, Issue 3, Page 553-577, March 2021., 2021
Runaway stars can result from core‐collapse supernovae in multiple stellar systems. If the supernova disrupts the system, the companion is ejected with its former orbital velocity. A clear identification of a runaway star can yield the time and place of the explosion, as well as orbital parameters of the pre‐supernova binary system.
Oliver Lux, Ralph Neuhäuser, Markus Mugrauer, Richard Bischoff   +3 more
wiley   +1 more source

A Spatially Resolved X-Ray Polarization Map of the Vela Pulsar Wind Nebula

The Astrophysical Journal Letters, 2023
In this paper, we present a full spatially resolved polarization map for the Vela pulsar wind nebula (PWN) observed by IXPE. By employing effective background discrimination techniques, our results show a remarkably high degree of local polarization in ...
Kuan Liu, Fei Xie, Yi-han Liu, Chi-Yung Ng, Niccolò Bucciantini, Roger W. Romani, Martin C. Weisskopf, Enrico Costa, Alessandro Di Marco, Fabio La Monaca, Fabio Muleri, Paolo Soffitta, Wei Deng, Yu Meng, En-wei Liang   +14 more
doaj   +1 more source

Discovery of GeV Gamma-Ray Emission from Pulsar Wind Nebula Kes 75 and PSR J1846–0258

The Astrophysical Journal, 2023
We report the detection of gamma-ray emission from pulsar wind nebula (PWN) Kes 75 and PSR J1846−0258. Through modeling the spectral energy distribution incorporating the new Fermi-LAT data, we find that the observed gamma-ray emission is likely a ...
Samayra M. Straal, Joseph D. Gelfand, Jordan L. Eagle   +2 more
doaj   +1 more source

Cannonball or Bowling Ball: Proper Motion and Parallax for PSR J0002+6216

The Astrophysical Journal, 2023
We report the results of careful astrometric measurements of the cannonball pulsar J0002+6216 carried out over 3 yr using the High Sensitivity Array. We significantly refine the proper motion to μ = 35.3 ± 0.6 mas yr ^−1 and place new constraints on the ...
S. Bruzewski, F. K. Schinzel, G. B. Taylor, P. Demorest, D. A. Frail, M. Kerr, P. Kumar   +6 more
doaj   +1 more source

Supernova remnants in nearby galaxies

Astronomische Nachrichten, Volume 341, Issue 2, Page 156-162, February 2020., 2020
Abstract Supernova remnants (SNRs) are the aftermath of stellar explosions, which inject large amounts of energy into the interstellar medium (ISM), carving out new structures and transferring kinetic energy to the ISM. They also act as recycling centers, which return elements processed in stars to the ISM, and cosmic particle accelerators.
Manami Sasaki
wiley   +1 more source

The Polarized Cosmic Hand: IXPE Observations of PSR B1509−58/MSH 15−52

The Astrophysical Journal, 2023
We describe IXPE polarization observations of the pulsar wind nebula (PWN) MSH 15−5 ^2 , the “Cosmic Hand.” We find X-ray polarization across the PWN, with B -field vectors generally aligned with filamentary X-ray structures.
Roger W. Romani, Josephine Wong, Niccoló Di Lalla, Nicola Omodei, Fei Xie, C.-Y. Ng, Riccardo Ferrazzoli, Alessandro Di Marco, Niccoló Bucciantini, Maura Pilia, Patrick Slane, Martin C. Weisskopf, Simon Johnston, Marta Burgay, Deng Wei, Yi-Jung Yang, Shumeng Zhang, Lucio A. Antonelli, Matteo Bachetti, Luca Baldini, Wayne H. Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Fiamma Capitanio, Simone Castellano, Elisabetta Cavazzuti, Chien-Ting Chen, Nicoló Cibrario, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Immacolata Donnarumma, Victor Doroshenko, Michal Dovčiak, Steven R. Ehlert, Teruaki Enoto, Yuri Evangelista, Sergio Fabiani, Javier A. Garcia, Shuichi Gunji, Kiyoshi Hayashida, Jeremy Heyl, Wataru Iwakiri, Ioannis Liodakis, Philip Kaaret, Vladimir Karas, Dawoon E. Kim, Takao Kitaguchi, Jeffery J. Kolodziejczak, Henric Krawczynski, Fabio La Monaca, Luca Latronico, Grzegorz Madejski, Simone Maldera, Alberto Manfreda, Frédéric Marin, Andrea Marinucci, Alan P. Marscher, Herman L. Marshall, Francesco Massaro, Giorgio Matt, Riccardo Middei, Ikuyuki Mitsuishi, Tsunefumi Mizuno, Fabio Muleri, Michela Negro, Stephen L. O’Dell, Chiara Oppedisano, Luigi Pacciani, Alessandro Papitto, George G. Pavlov, Matteo Perri, Melissa Pesce-Rollins, Pierre-Olivier Petrucci, Andrea Possenti, Juri Poutanen, Simonetta Puccetti, Brian D. Ramsey, John Rankin, Ajay Ratheesh, Oliver J. Roberts, Carmelo Sgró, Paolo Soffitta, Gloria Spandre, Douglas A. Swartz, Toru Tamagawa, Fabrizio Tavecchio, Roberto Taverna, Yuzuru Tawara, Allyn F. Tennant, Nicholas E. Thomas, Francesco Tombesi, Alessio Trois, Sergey Tsygankov, Roberto Turolla, Jacco Vink, Kinwah Wu, Silvia Zane   +102 more
doaj   +1 more source

Magnetic Reconnection in the Space Sciences: Past, Present, and Future

Journal of Geophysical Research: Space Physics, Volume 125, Issue 2, February 2020., 2020
Abstract Magnetic reconnection converts, often explosively, stored magnetic energy to particle energy in space and in the laboratory. Through processes operating on length scales that are tiny, it facilitates energy conversion over dimensions of, in some cases, hundreds of Earth radii.
M. Hesse, P. A. Cassak
wiley   +1 more source

Turbulent Diffusion of the Particles within Pulsar Wind Nebulae

The Astrophysical Journal, 2023
A turbulent diffusion model is presented to account for the energy and spatial diffusion of the particles within pulsar wind nebulae (PWNe), with the assumption that the energy injected from the pulsar into the nebula is split between the turbulence ...
Fang-Wu Lu, Bo-Tao Zhu, Wen Hu, Li Zhang
doaj   +1 more source