Misalignment of the microquasar V4641 Sgr (SAX J1819.3--2525)

Abstract

In the microquasar V4641 Sgr the spin of the black hole is thought to be misaligned with the binary orbital axis. The accretion disc aligns with the black hole spin by the Lense-Thirring effect near to the black hole and further out becomes aligned with the binary orbital axis. The inclination of the radio jets and the Fe$K\alpha$ line profile have both been used to determine the inclination of the inner accretion disc but the measurements are inconsistent. Using a steady state analytical warped disc model for V4641 Sgr we find that the inner disc region is flat and aligned with the black hole up to about $900R_{\mathrm{g}}$. Thus if both the radio jet and fluorescent emission originates in the same inner region then the measurements of the inner disc inclination should be the same.

Accepted for publication in MNRAS

References in corpus (6)

• Broad iron K-alpha emission lines as a diagnostic of black hole spin
• A systematic look at the Very High and Low/Hard state of GX 339-4: Constraining the black hole spin with a new reflection model
• Initial Measurements of Black Hole Spin in GX 339-4 from Suzaku Spectroscopy
• Alignment and Precession of a Black Hole with a Warped Accretion Disc
• Alignment Timescale of the Microquasar GRO J1655-40
• The Warped Disc of NGC 4258

Cited by in corpus (7)

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• The Kozai-Lidov Mechanism in Hydrodynamical Disks
• Global Simulations of the Interaction of Microquasar Jets with a Stellar Wind in High-Mass X-ray Binaries
• The Bardeen-Petterson effect in accreting supermassive black-hole binaries: disc breaking and critical obliquity
• Alignment and precession of a black hole misaligned with its accretion disc: Application to Low Mass X-ray Binaries
• Study of a Tilted Thin Accretion Disk around a Kerr-Taub-NUT black hole