Broad Balmer line emission and cosmic ray acceleration efficiency in supernova remnant shocks
نویسندگان
چکیده
منابع مشابه
Cosmic-ray acceleration in supernova shocks
Galactic cosmic rays are widely believed to be accelerated in expanding shock waves initiated by supernova explosions. The theory of diffusive shock acceleration of cosmic rays is now well established, but two fundamental questions remain partly unanswered: what is the acceleration efficiency, i.e. the fraction of the total supernova energy converted to cosmic-ray energy, and what is the maximu...
متن کاملA Cosmic-ray Precursor Model for a Balmer-dominated Shock in Tycho’s Supernova Remnant
We present a time-dependent cosmic-ray modified shock model for which the calculated Hα emissivity profile agrees well with the Hα flux increase ahead of the Balmer-dominated shock at knot g in Tycho’s supernova remnant, observed by Lee et al. (2007). The backreaction of the cosmic ray component on the thermal component is treated in the two-fluid approximation, and we include thermal particle ...
متن کاملThe X-ray Line Emission from the Supernova Remnant W49b
The Galactic supernova remnant W49B has one of the most impressive X-ray emission line spectra obtained with the Advanced Satellite for Cosmology and Astronomy (ASCA). We use both plasma line diagnostics and broadband model fits to show that the Si and S emission lines require multiple spectral components. The spectral data do not necessarily require individual elements to be spatially stratifi...
متن کاملSurfatron and stochastic acceleration of electrons at supernova remnant shocks.
The surfatron offers the possibility of particle acceleration to arbitrarily high energies, given a sufficiently large system. Surfatron acceleration of electrons by waves excited by ions reflected from supernova remnant (SNR) shocks is investigated using particle simulations. It is shown that surfatron and stochastic acceleration could provide a seed population for the acceleration of cosmic r...
متن کاملTurbulence and particle acceleration in collisionless supernovae remnant shocks II- Cosmic-ray transport
Supernovae remnant shock waves could be at the origin of cosmic rays up to energies in excess of the knee (E ≃ 3 · 10 eV) if the magnetic field is efficiently amplified by the streaming of accelerated particles in the shock precursor. This paper follows up on a previous paper (Pelletier et al 2006) which derived the properties of the MHD turbulence so generated, in particular its anisotropic ch...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2013
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201322006