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
N1 - Funding Information:
Numerical computations were carried out on Cray XC30 at the Center for Computational Astrophysics, National Astronomical Observatory of Japan. This work is supported in part by JSPS Grant-in-Aid for Scientific Research (B) (15H03643 T.O., 15K05036 K.O.), for Young Scientists (17K14260 H.R.T.), and for Research Fellow (15J04405 S.T.). This research was also supported by MEXT as “Priority Issue on Post-K computer” (Elucidation of the Fundamental Laws and Evolution of the Universe) and JICFuS.
Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved..
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
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U2 - 10.3847/1538-4357/aabe32
DO - 10.3847/1538-4357/aabe32
M3 - Article
AN - SCOPUS:85047971812
SN - 0004-637X
VL - 859
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 29
ER -