Results 11 to 20 of about 9,517 (211)
Supernova Remnants in the Irregular Galaxy NGC 4449
The Astrophysical Journal, 2023 The nearby irregular galaxy NGC 4449 has a star formation rate of ∼0.4 M _☉ yr ^−1 and should host of order 70 supernova remnants (SNRs) younger than 20,000 yr, a typical age for SNRs expanding into an interstellar medium (ISM) with a density of 1 cm ^−3
P. Frank Winkler +2 more
doaj +1 more source
Cosmic-Ray Acceleration in Supernova Remnants
Universe, 2023 Supernova Remnants (SNRs) are generally believed to produce the cosmic rays in our Galaxy due to the powerful supernova blast waves generated by expanding SNRs.
Vera G. Sinitsyna, Vera Y. Sinitsyna
doaj +1 more source
Pre-acceleration in the Electron Foreshock. II. Oblique Whistler Waves
The Astrophysical Journal, 2023 Thermal electrons have gyroradii many orders of magnitude smaller than the finite width of a shock, thus need to be pre-accelerated before they can cross it and be accelerated by diffusive shock acceleration.
Paul J. Morris +5 more
doaj +1 more source
International Astronomical Union Colloquium, 1989 Abstract.In this review I will concentrate on older remnants, by which I mean those in which radiative cooling is important somewhere and the swept up mass is sufficiently large for the details of the initial explosion not to matter. For such remnants it is the optical emission which is crucial since it allows us to deduce a great deal about the ...
openaire +1 more source
The Supernova – Supernova Remnant Connection [PDF]
, 2016 Many aspects of the progenitor systems, environments, and explosion dynamics of the various subtypes of supernovae are difficult to investigate at extragalactic distances where they are observed as unresolved sources. Alternatively, young supernova remnants in our own galaxy and in the Large and Small Magellanic Clouds offer opportunities to resolve ...
Milisavljevic, Dan, Fesen, Robert A.
openaire +2 more sources
Plerionic supernova remnants [PDF]
AIP Conference Proceedings, 2012 AIP Conference Proceedings of the 5th International Symposium on High-Energy Gamma-Ray Astronomy, Heidelberg, July 9-13 (2012). Eds: F. Aharonian, W. Hofmann, F. Rieger. Solicited review, 8 pages, 4 colour figures. The figures resolution has been reduced for astro-ph.
openaire +2 more sources
Numerical code for fitting radial emission profile of a shell supernova remnant: Application [PDF]
Serbian Astronomical Journal, 2011 We present IDL (Interactive Data Language) codes for fitting a theoretical emission profile of a shell supernova remnant (SNR) to the mean profile of an SNR obtained from radio observations. Two considered theoretical models are: 1) a shell with
Opsenica Slobodan, Arbutina Bojan
doaj +1 more source
Are Supernovae Responsible for the Gamma Ray Spectrum from the Galactic Center?
Acta Polytechnica CTU Proceedings, 2014 We discuss the supernova remnants distribution as a function of the galactic longitude and compare their positions to that of the detected TeV gamma ray sources. A large fraction of these sources either coincide or a close by known supernova remnants. If
Todor Stanev
doaj +1 more source
Radio Emission from Supernova Remnants: Model Comparison with Observations
Universe, 2022 Supernova remnants (SNRs) are an integral part in studying the properties of the Galaxy and its interstellar medium. For the current work, we compare the observed radio luminosities of SNRs to predictions based on a recent analytic model applied to 54 ...
Denis A. Leahy +2 more
doaj +1 more source
Multiple-supernova remnants [PDF]
International Astronomical Union Colloquium, 1989 ABSTRACTThe present observational and theoretical status of multiple-supernova remnants is briefly reviewed, and evolutionary models of the remnants around OB associations are presented. The remnants are followed for up to almost 30 Myr in various galactic environments (Gaussian or composite disks combined with cold or hot halos).
openaire +1 more source