MHD instabilities in accretion mounds – 1: 2D axisymmetric simulations

Дата и время публикации : 2012-12-17T06:30:52Z

Авторы публикации и институты :
Dipanjan Mukherjee
Dipankar Bhattacharya
Andrea Mignone

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: Accepted for publication in MNRAS, 2013
Первичная категория: astro-ph.HE

Все категории : astro-ph.HE, physics.plasm-ph

Краткий обзор статьи: We have performed stability analysis of axisymmetric accretion mounds on neutron stars in High Mass X-ray Binaries (HMXB) by 2-D MHD simulations with the PLUTO MHD code. We find that the mounds are stable with respect to interchange instabilities, but addition of excess mass destabilizes the equilibria. Our simulations confirm that accretion mounds are unstable with respect to MHD instabilities beyond a threshold mass. We investigate both filled and hollow mounds and the for the latter also compute the expected profile of cyclotron resonance scattering features (CRSF). In comparison to CRSF from filled mounds reported in our earlier work, hollow mounds display wider and more complex line profiles.

Category: Physics