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Astrophysics > High Energy Astrophysical Phenomena

arXiv:1905.11319v1 (astro-ph)
[Submitted on 27 May 2019 (this version), latest version 8 Oct 2019 (v2)]

Title:Black Hole Spin and Accretion Disk Magnetic Field Strength Estimates for more than 750 AGN and Multiple GBH

Authors:Ruth A. Daly
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Abstract:Black hole systems, comprised of a black hole, accretion disk, and collimated outflow are studied here. Three AGN samples including 753 AGN, and 102 measurements of 4 GBH are studied. Applying the theoretical considerations described by Daly (2016), general expressions for the black hole spin function and accretion disk magnetic field strength are presented and applied to obtain the black hole spin function, spin, and accretion disk magnetic field strength in dimensionless and physical units for each source. Relatively high spin values are obtained; spin functions indicate typical spin values of about (0.6 - 1) for the sources. The distribution of accretion disk magnetic field strengths for the three AGN samples are quite similar and have mean values of about $10^4$ G, while those for individual GBH are similar and have mean values of about $10^8$ G. Good agreement is found between spin values obtained here and published values obtained with well-established methods; comparisons for 1 GBH and 6 AGN indicate that similar spin values are obtained with independent methods. Sgr $A^*$ and M87 are included in the study, and relatively high spin values are obtained for these sources. Black hole spin and disk magnetic field strength demographics are obtained and indicate that black hole spin functions and spins are similar for all of the source types studied including GBH and different categories of AGN.
Comments: 34 pages, 10 figures, 5 tables
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE); Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:1905.11319 [astro-ph.HE]
  (or arXiv:1905.11319v1 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.1905.11319

Submission history

From: Ruth A. Daly [view email]
[v1] Mon, 27 May 2019 16:10:09 UTC (129 KB)
[v2] Tue, 8 Oct 2019 20:52:25 UTC (119 KB)
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