A unified accretion-ejection paradigm for Black Hole X-ray Binaries

Details A unified accretion-ejection paradigm for Black Hole X-ray Binaries A unified accretion-ejection paradigm for Black Hole X-ray Binaries

2005-11-04

arxiv.org/abs/astro-ph/0511123v1

Astronomy and Astrophysics

Astrophysics

15 pages, 2 figures. Accepted by A&A main journal

Scientific paper

10.1051/0004-6361:20052689

We present a new picture for the central regions of Black Hole X-ray Binaries. In our view, these central regions have a multi-flow configuration which consists in (1) an outer standard accretion disc down to a transition radius r_J, (2) an inner magnetized accretion disc below r_J driving (3) a non relativistic self-collimated electron-proton jet surrounding, when adequate conditions for pair creation are met, (4) a ultra relativistic electron-positron beam. This accretion-ejection paradigm provides a simple explanation to the canonical spectral states by varying the transition radius r_J and disc accretion rate independently. Large values of r_J correspond to the Quiescent state for low $\dot m$ and the Hard state for larger $\dot m$. These states are characterized by the presence of a steady electron-proton MHD jet emitted by the disc below r_J. The hard X-ray component is expected to form at the jet basis. When r_j becomes smaller than the marginally stable orbit r_i, the whole disc resembles a standard accretion disc, characteristic of the Soft state. Intermediate states correspond to situations where r_J ~ r_i. At large $\dot m$, an unsteady pair cascade process is triggered within the jet axis, giving birth to ejection of relativistic pair blobs. This would correspond to the luminous intermediate state, with its associated superluminal motions. The variation of r_J independently of $\dot m$ is a necessary ingredient in this picture, arising from the presence of a large scale vertical magnetic field threading the disc.

Affiliated with

Also associated with

No associations

Rating

A unified accretion-ejection paradigm for Black Hole X-ray Binaries does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A unified accretion-ejection paradigm for Black Hole X-ray Binaries, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A unified accretion-ejection paradigm for Black Hole X-ray Binaries will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-57724