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  • Space Radiation  (3)
  • Neutron stars  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Gamma-rays from neutron stars (1995)
    Springer
    The astronomy and astrophysics review 6 (1995), S. 225-270 
    Details
    ISSN: 1432-0754
    Keywords: Neutron stars ; Gamma-ray bursts ; Pulsars ; Nucleosynthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The number of Galactic neutron stars is significant, N ∼ 108–9, but radiation from their surfaces is hard to detect. The nearest isolated neutron stars could be as close as ∼ 10 pc (the estimate sensitively depends on assumptions about initial velocities), but would probably be too old, and thus too cold, for optical detections. Thatγ-ray emission is a useful alternative window for neutron star studies was revealed through observations of pulsedγ-ray emission from the Crab and Vela pulsars (e.g. Bignami 1987). A wealth of recentγ-ray observations of neutron stars is provided by sophisticated experiments aboard the COMPTON Gamma Ray Observatory (CGRO) and several other spacecraft. We summarize the current status of the Galactic population ofγ-ray pulsars. Gamma ray bursts are also believed to be associated with neutron stars. Although data from BATSE aboard CGRO have recently challenged the standard paradigm thatγ-ray bursts (GRBs) originate on or near neutron stars in the Galactic disk, the possibility of bursts from an extended Galactic halo of high velocity neutron stars is still under consideration. Furthermore, many cosmological scenarios also invoke neutron stars as the energy source. We thus include GRBs in this review. A subset of GRBs, the soft gamma repeaters, has recently been associated with Galactic supernova remnants. Their properties and counterparts are discussed. In addition, we briefly describeγ-ray emission from slowly accreting neutron stars, and theγ-ray line afterglow resulting from production of radioactive isotopes during their birth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01837116
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    Paper (German National Licenses)
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  • 2
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    Radiation from Accelerated Particles in Shocks and Reconnections (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: We have investigated particle acceleration and shock structure associated with an unmagnetized relativistic jets propagating into an unmagnetized plasmas. Strong magnetic fields generated in the trailing shock contribute to the electrons transverse deflection and acceleration. We have calculated, self-consistently, the radiation from electrons accelerated in the turbulent magnetic fields. We found that the synthetic spectra depend on the Lorentz factor of the jet, its thermal temperature and strength of the generated magnetic fields. The properties of the radiation may be important for understanding the complex time evolution and/or spectral structure in gamma-ray bursts, relativistic jets in general, and supernova remnants
    Keywords: Space Radiation
    Type: M12-1585 , Fermi/Swift GRF 2012 Conference; May 07, 2012 - May 11, 2012; Munich; Germany
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    On the Association of Gamma-Ray Bursts with Supernovae (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The recent discovery of a supernova (SN 1998bw) seemingly associated with GRB 980425 adds a new twist to the decades-old debate over the origin of gamma-ray bursts. To investigate the possibility that some (or all) bursts are associated with supernovae, we performed a systematic search for temporal/angular correlations using catalogs of BATSE and BATSE/Ulysses burst locations. We find no associations with any of the precise BATSE/Ulysses locations, which allows us to conclude that the fraction of high-fluence gamma-ray bursts associated with known supernovae is small (〈0.2%). For the more numerous weaker bursts, the corresponding limiting fraction of 2.5% is far less constraining due to the imprecise locations of these events. This fraction (2.5%) of bursts corresponds to approximately 30% of the recent supernovae used as a comparison data set. Thus, although we find no significant evidence to support a burst/supernova association, the possibility cannot be excluded for weak bursts.
    Keywords: Space Radiation
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Simulation of Relativistic Shocks and Associated Self-Consistent Radiation (2010)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: Plasma instabilities excited in collisionless shocks are responsible for particle acceleration. We have investigated the particle acceleration and shock structure associated with an unmagnetized relativistic electron-positron jet propagating into an unmagnetized electron-positron plasma. Cold jet electrons are thermalized and slowed while the ambient electrons are swept up to create a partially developed hydrodynamic-like shock structure. In the leading shock, electron density increases by a factor of about 3.5 in the simulation frame. Strong electromagnetic fields are generated in the trailing shock and provide an emission site. These magnetic fields contribute to the electrons transverse deflection behind the shock. We calculate the radiation from deflected electrons in the turbulent magnetic fields. The properties of this radiation may be important for understanding the complex time evolution and/or spectral structure in gamma-ray bursts, relativistic jets in general, and supernova remnants.
    Keywords: Space Radiation
    Type: M10-0176 , M10-0132 , M10-0133 , Dynamical Processes in Space Plasmas; May 11, 2008 - May 19, 2008; Ein-bokek; Israel|High Energy Astrophysics Division (HEAD) 2010; Mar 01, 2010 - Mar 04, 2010; Big Island, HI; United States|Acceleration and Emission Processes at High Energies and their Application to AGN; Jan 25, 2010 - Jan 26, 2010; Paris; France
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    NASA TECHNICAL REPORTS
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