Magnetohydrodynamic Simulations of a Plunging Black Hole into a Molecular Cloud

Mariko Nomura, Tomoharu Oka, Masaya Yamada, Shunya Takekawa, Ken Ohsuga, Hiroyuki R. Takahashi, Yuta Asahina

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Using two-dimensional magnetohydrodynamic simulations, we investigated the gas dynamics around a black hole (BH) 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 BH. 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 BH plunged into a molecular cloud to form a compact broad-velocity-width feature.

Original languageEnglish
Article number29
JournalAstrophysical Journal
Volume859
Issue number1
DOIs
Publication statusPublished - 2018 May 20

Fingerprint

magnetohydrodynamic simulation
magnetohydrodynamics
molecular clouds
field layer
simulation
gas dynamics
magnetic field
Mach number
gas
radii
magnetic fields
calculation
parameter

Keywords

  • ISM: clouds
  • ISM: kinematics and dynamics
  • magnetohydrodynamics (MHD)
  • methods: numerical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Nomura, M., Oka, T., Yamada, M., Takekawa, S., Ohsuga, K., Takahashi, H. R., & Asahina, Y. (2018). Magnetohydrodynamic Simulations of a Plunging Black Hole into a Molecular Cloud. Astrophysical Journal, 859(1), [29]. https://doi.org/10.3847/1538-4357/aabe32

Magnetohydrodynamic Simulations of a Plunging Black Hole into a Molecular Cloud. / Nomura, Mariko; Oka, Tomoharu; Yamada, Masaya; Takekawa, Shunya; Ohsuga, Ken; Takahashi, Hiroyuki R.; Asahina, Yuta.

In: Astrophysical Journal, Vol. 859, No. 1, 29, 20.05.2018.

Research output: Contribution to journalArticle

Nomura, M, Oka, T, Yamada, M, Takekawa, S, Ohsuga, K, Takahashi, HR & Asahina, Y 2018, 'Magnetohydrodynamic Simulations of a Plunging Black Hole into a Molecular Cloud', Astrophysical Journal, vol. 859, no. 1, 29. https://doi.org/10.3847/1538-4357/aabe32
Nomura, Mariko ; Oka, Tomoharu ; Yamada, Masaya ; Takekawa, Shunya ; Ohsuga, Ken ; Takahashi, Hiroyuki R. ; Asahina, Yuta. / Magnetohydrodynamic Simulations of a Plunging Black Hole into a Molecular Cloud. In: Astrophysical Journal. 2018 ; Vol. 859, No. 1.
@article{330bb3de71944843a033fb59b1fcd4a3,
title = "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 (BH) 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 Alfv{\'e}n Mach number for the plunging BH. 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 BH plunged into a molecular cloud to form a compact broad-velocity-width feature.",
keywords = "ISM: clouds, ISM: kinematics and dynamics, magnetohydrodynamics (MHD), methods: numerical",
author = "Mariko Nomura and Tomoharu Oka and Masaya Yamada and Shunya Takekawa and Ken Ohsuga and Takahashi, {Hiroyuki R.} and Yuta Asahina",
year = "2018",
month = "5",
day = "20",
doi = "10.3847/1538-4357/aabe32",
language = "English",
volume = "859",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - Magnetohydrodynamic Simulations of a Plunging Black Hole into a Molecular Cloud

AU - Nomura, Mariko

AU - Oka, Tomoharu

AU - Yamada, Masaya

AU - Takekawa, Shunya

AU - Ohsuga, Ken

AU - Takahashi, Hiroyuki R.

AU - Asahina, Yuta

PY - 2018/5/20

Y1 - 2018/5/20

N2 - Using two-dimensional magnetohydrodynamic simulations, we investigated the gas dynamics around a black hole (BH) 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 BH. 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 BH plunged into a molecular cloud to form a compact broad-velocity-width feature.

AB - Using two-dimensional magnetohydrodynamic simulations, we investigated the gas dynamics around a black hole (BH) 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 BH. 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 BH plunged into a molecular cloud to form a compact broad-velocity-width feature.

KW - ISM: clouds

KW - ISM: kinematics and dynamics

KW - magnetohydrodynamics (MHD)

KW - methods: numerical

UR - http://www.scopus.com/inward/record.url?scp=85047971812&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85047971812&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/aabe32

DO - 10.3847/1538-4357/aabe32

M3 - Article

VL - 859

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 29

ER -