Magnetohydrodynamic Simulations of a Plunging Black Hole into a Molecular Cloud

Abstract

Using two-dimensional magnetohydrodynamic simulations, we investigated the gas dynamics around a black hole plunging into a molecular cloud. In these calculations, we assumed a parallel-magnetic-field layer in the cloud. The size of the accelerated region is far larger than the Bondi-Hoyle-Lyttleton radius, being approximately inversely proportional to the Alfvén Mach number for the plunging black hole. Our results successfully reproduce the "Y" shape in position velocity maps of the "Bullet" in the W44 molecular cloud. The size of the Bullet is also reproduced within an order of magnitude using a reasonable parameter set. This consistency supports the shooting model of the Bullet, according to which an isolated black hole plunged into a molecular cloud to form a compact broad-velocity-width feature.

arXiv comment9 pages, 8 figures, Accepted for publication in The Astrophysical Journal

References in corpus (11)

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• A Review of Bondi--Hoyle--Lyttleton Accretion
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• Discovery of Two Small High-Velocity Compact Clouds in the Central 10 Parsecs of Our Galaxy
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Cited by in corpus (6)

• Indication of Another Intermediate-mass Black Hole in the Galactic Center
• The Fifth Candidate for an Intermediate-mass Black Hole in the Galactic Center
• An energetic high-velocity compact cloud: CO$-$0.31+0.11
• Catalog of High Velocity Dispersion Compact Clouds in the Central Molecular Zone of Our Galaxy
• Broad-velocity-width Molecular Features in the Galactic Plane
• ALMA View of the High-velocity-dispersion Compact Cloud CO 0.02-0.02 at the Galactic Center