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On the Theoretical Framework of Magnetized Outflows from Stellar-Mass Black Holes and Related ObservationsThe spins of stellar-mass black holes (BHs) and the power outputs of their jets are measurable quantities. Unfortunately, the currently employed methods do not agree and the results are controversial. Two major issues concern the measurements of BH spin and beam (jet) power. The former issue can be resolved by future observations. But the latter issue can be resolved now, if we pay attention to what is expected from theoretical considerations. The question of whether a correlation has been found between the power outputs of few objects and the spins of their BHs is moot because BH beam power does not scale with the square of the spin of the BH. We show that the theoretical BH beam power is a strongly nonlinear function of spin that cannot be approximated by a quadratic relation, as is generally stated when the influence of the magnetic field is not accounted for in the Blandford & Znajek model. The BH beam power of ballistic jets should scale a lot more steeply with BH spin irrespective of the magnetic field assumed to thread the horizon and the spin range considered. This behavior may already be visible in the analyses of radio observations by Narayan & McClintock and Russell et al. In agreement with previous studies, we also find that the power output that originates in the inner regions of the surrounding accretion disks is higher than that from the BHs and it cannot be ignored in investigations of continuous compact jets from these systems.
Document ID
20170005802
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Christodoulou, D. M. (Massachusetts Univ. Lowell, MA, United States)
Contopoulos, I. (Academy of Athens Greece)
Kazanas, D. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Steiner, J. F. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Papadopoulos, D. B. (Aristotle Univ. of Thessaloniki Greece)
Laycock, S. G. T. (Massachusetts Univ. Lowell, MA, United States)
Date Acquired
June 28, 2017
Publication Date
June 26, 2016
Publication Information
Publication: Monthly Notice of the Royal Astronomical Society
Volume: 461
Issue: 3
ISSN: 0035-8711
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN41810
Funding Number(s)
CONTRACT_GRANT: PF5-160144
CONTRACT_GRANT: NNX14-AF77G
Distribution Limits
Public
Copyright
Other
Keywords
accretion
accretion disks—black hole physics—ISM: jets and outflows—