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2019

The Shadow of a Spherically Accreting Black Hole

Narayan, Ramesh, Johnson, Michael D., Gammie, Charles F.

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We explore a simple spherical model of optically thin accretion on a Schwarzschild black hole, and study the properties of the image as seen by a distant observer.

We show that a dark circular region in the center --- a shadow --- is always present.
The outer edge of the shadow is located at the photon ring radius $b_{\rm ph} \equiv \sqrt{27}r_g$, where $r_g=GM/c^2$ is the gravitational radius of the accreting mass $M$.
The location of the shadow edge is independent of the inner radius at which the accreting gas stops radiating.

The Shadow of a Spherically Accreting Black Hole · Around

Built on

Johnson, M.D., Lupsasca, A., Strominger, A., et al., 2019, arXiv:1907.04329
Original
1907
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Darwin, C., 1959, Proc. Roy. Soc. London. Ser. A, 249, 180
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Bardeen, J.M., 1973, in Dewitt, C., Dewitt, B.S., eds, Black Holes (Les Astres Occlus), Gordon & Breach, New York, p. 215
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Similar

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Cited alongside, same era.
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2014
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Original
2015
Cited alongside, same era.
The Event Horizon Telescope Collaboration, 2019a, ApJL, 875, L1 (EHT1)
Cited in the paper.
The Event Horizon Telescope Collaboration, 2019b, ApJL, 875, L2 (EHT2)
Cited in the paper.
The Event Horizon Telescope Collaboration, 2019c, ApJL, 875, L3 (EHT3)
Cited in the paper.
The Event Horizon Telescope Collaboration, 2019d, ApJL, 875, L4 (EHT4)
Cited in the paper.
The Event Horizon Telescope Collaboration, 2019e, ApJL, 875, L5 (EHT5)
Cited in the paper.
The Event Horizon Telescope Collaboration, 2019f, ApJL, 875, L6 (EHT6)
Cited in the paper.

Then

Narayan, R., Zhu, Y., Psaltis, D., Sadowski, A., 2016, MNRAS, 457, 608
2016
Later among the works it cites.
Pu, H.-Y., Wu, K., Younsi, Z., Asada, K., Mizuno, Y., Nakamura, M., 2017, ApJ, 845, 160
2017
Later among the works it cites.
Walker, R.C., Hardee, P.E., Davies, F.B., Ly, C., Junor, W., 2018, ApJ, 855, 128
2018
Later among the works it cites.
Gralla, S.E., Holz, D.E., Wald, R.M., 2019, PRD, 100, 024018
2019
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