We investigate the escape process from a perpendicular shock region of spherical in interstellar medium (ISM). The diffusive acceleration supernova remnants (SNRs) has been expected to accelerate cosmic rays (CRs) PeV scale without an upstream magnetic field amplification. estimate maximum energy CRs limited by region. By performing test particle simulations, we confirm theoretical estimation, ...

Criterion of the Jeans instability of interstellar gas clouds which are gravitationally coupled with weakly interacting massive particles is revisited. It is established that presence of the dark matter always reduces the Jeans length, and in turn, Jeans mass of the interstellar gas clouds. Astrophysical implications of this effect are discussed. Subject headings: dark matter — gravitation — in...

EDITORIAL article Front. Astron. Space Sci., 09 January 2023Sec. Astrostatistics Volume 9 - 2022 | https://doi.org/10.3389/fspas.2022.1115995

[1] Current estimates of plasma parameters in the local interstellar medium indicate that the speed of the interstellar wind, i.e., the relative speed of the local interstellar cloud with respect to the Sun, is most likely less than both the fast magnetosonic speed (subfast) and the Alfvén speed (sub-Alfvénic) but greater than the slow magnetosonic speed (superslow). In this peculiar parameter ...

Abstract Prior to the Voyagers’ heliopause crossings, models and community expected magnetic field show major rotations across boundary. Surprisingly, showed no significant change in direction from heliospheric Parker Spiral at either Voyager location. Meanwhile, a result IBEX mission is derived magnitude of interstellar far Sun (∼1000 au) beyond influence heliosphere. Using self-consistent mod...

We study the generation and maintenance of large-scale magnetic fields in barred galaxies. We take a velocity field (with strong noncircular components) from a published gas dynamical simulation of Athanassoula (1992), and use this as input to a galactic dynamo calculation. Our work is largely motivated by recent high quality VLA radio observations of the barred galaxy NGC 1097, and we compare ...