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Hot accretion flow with radiative cooling: state transitions in black hole X-ray binaries
- Source :
- Monthly Notices of the Royal Astronomical Society. 459:1543-1553
- Publication Year :
- 2016
- Publisher :
- Oxford University Press (OUP), 2016.
-
Abstract
- We investigate state transitions in black hole X-ray binaries through different parameters by using two-dimensional axisymmetric hydrodynamical simulation method. For radiative cooling in hot accretion flow, we take into account the bremsstrahlung, synchrotron and synchrotron-self Comptonization self-consistently in the dynamics. Our main result is that the state transitions occur when the accretion rate reaches a critical value $\dot M \sim 3\alpha\ \dot M_{\rm Edd}$, above which cold and dense clumpy/filamentary structures are formed, embedded within the hot gas. We argued this mode likely corresponds to the proposed two-phase accretion model, which may be responsible for the intermediate state of black hole X-ray binaries. When the accretion rate becomes sufficiently high, the clumpy/filamentary structures gradually merge and settle down onto the mid-plane. Eventually the accretion geometry transforms to a disc-corona configuration. In summary our results are consistent with the truncated accretion scenario for the state transition.<br />Comment: 13 pages, 10 figures, accepted by MNRAS
- Subjects :
- Radiative cooling
Astrophysics::High Energy Astrophysical Phenomena
Rotational symmetry
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
01 natural sciences
law.invention
law
0103 physical sciences
Astrophysics::Solar and Stellar Astrophysics
Intermediate state
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics
010308 nuclear & particles physics
X-ray
Bremsstrahlung
Astronomy and Astrophysics
Critical value
Synchrotron
Accretion (astrophysics)
Space and Planetary Science
Astrophysics::Earth and Planetary Astrophysics
Astrophysics - High Energy Astrophysical Phenomena
Subjects
Details
- ISSN :
- 13652966 and 00358711
- Volume :
- 459
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Accession number :
- edsair.doi.dedup.....dbaef5c329e40ca6a3cebcf788d652c1