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Cited by 542

The DOI matches its Crossref record; 45 of the 45 references it cites were found in a registry or an index.

BLACK HOLE SPIN AND THE RADIO LOUD/QUIET DICHOTOMY OF ACTIVE GALACTIC NUCLEI

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Tchekhovskoy, Alexander, Narayan, Ramesh, McKinney, Jonathan C.·2010·The Astrophysical Journal
DOI 10.1088/0004-637x/711/1/50
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Abstract

Radio loud active galactic nuclei (AGNs) are on average 1000 times brighter in the radio band compared to radio quiet AGNs. We investigate whether this radio loud/quiet dichotomy can be due to differences in the spin of the central black holes (BHs) that power the radio-emitting jets. Using general relativistic magnetohydrodynamic simulations, we construct steady state axisymmetric numerical models for a wide range of BH spins (dimensionless spin parameter 0.1 ⩽ a ⩽ 0.9999) and a variety of jet geometries. We assume that the total magnetic flux through the BH horizon at radius r H ( a ) is held constant. If the BH is surrounded by a thin accretion disk, we find that the total BH power output depends approximately quadratically on the angular frequency of the hole, P ∝ Ω 2 H ∝ ( a / r H ) 2 . We conclude that, in this scenario, differences in the BH spin can produce power variations of only a few tens at most. However, if the disk is thick such that the jet subtends a narrow solid angle around the polar axis, then the power dependence becomes much steeper, P ∝ Ω 4 H or even ∝Ω 6 H . Power variations of 1000 are then possible for realistic BH spin distributions. We derive an analytic solution that accurately reproduces the steeper scaling of jet power with Ω H and we provide a numerical fitting formula that reproduces all our simulation results. We discuss other physical effects that might contribute to the observed radio loud/quiet dichotomy of AGNs.

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Metadata

Authors
Tchekhovskoy, A., Narayan, R., & McKinney, J. C.
Venue
The Astrophysical Journal
Publisher
American Astronomical Society
Published
2010-02-06
Volume
711
Issue
1
Pages
50-63
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
DOI
10.1088/0004-637x/711/1/50
OpenAlex
W1970566880
Cited by
542
References
45
FWCI
18.78
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: BLACK HOLE SPIN AND THE RADIO LOUD/QUIET DICHOTOMY OF ACTIVE GALACTIC NUCLEI. https://app.cochat.ai/papers/10.1088/0004-637x/711/1/50
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Tchekhovskoy, A., Narayan, R., & McKinney, J. C. (2010). BLACK HOLE SPIN AND THE RADIO LOUD/QUIET DICHOTOMY OF ACTIVE GALACTIC NUCLEI. The Astrophysical Journal. https://doi.org/10.1088/0004-637x/711/1/50

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