• 1630 Citations
  • 22 h-Index
19942019
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Research Output 1994 2019

  • 1630 Citations
  • 22 h-Index
  • 70 Article
  • 2 Conference contribution
  • 2 Conference article
2019
2 Citations (Scopus)

Indication of Another Intermediate-mass Black Hole in the Galactic Center

Takekawa, S., Oka, T., Iwata, Y., Tsujimoto, S. & Nomura, M., 2019 Jan 20, In : Astrophysical Journal Letters. 871, 1, L1.

Research output: Contribution to journalArticle

Open Access
indication
galaxies
gas streams
ionized gases
molecular gases
2018

Detection of Another Molecular Bubble in the Galactic Center

Tsujimoto, S., Oka, T., Takekawa, S., Yamada, M., Tokuyama, S., Iwata, Y. & Roll, J. A., 2018 Apr 1, In : Astrophysical Journal. 856, 2, 91.

Research output: Contribution to journalArticle

bubble
bubbles
star clusters
shell
massive stars
1 Citation (Scopus)

Magnetohydrodynamic Simulations of a Plunging Black Hole into a Molecular Cloud

Nomura, M., Oka, T., Yamada, M., Takekawa, S., Ohsuga, K., Takahashi, H. R. & Asahina, Y., 2018 May 20, In : Astrophysical Journal. 859, 1, 29.

Research output: Contribution to journalArticle

magnetohydrodynamic simulation
magnetohydrodynamics
molecular clouds
field layer
simulation
2017
7 Citations (Scopus)

Discovery of Two Small High-velocity Compact Clouds in the Central 10 pc of Our Galaxy

Takekawa, S., Oka, T., Iwata, Y., Tokuyama, S. & Nomura, M., 2017 Jul 1, In : Astrophysical Journal Letters. 843, 1, L11.

Research output: Contribution to journalArticle

galaxies
molecular clouds
kinematics
1 Citation (Scopus)

Distance to the Low-velocity Cloud in the Direction of the High-velocity Compact Cloud CO-0.40-0.22

Iwata, Y., Kato, H., Sakai, D. & Oka, T., 2017 May 1, In : Astrophysical Journal. 840, 1, 18.

Research output: Contribution to journalArticle

low speed
masers
astrometry
parallax
molecular clouds
6 Citations (Scopus)

KINEMATICS of ULTRA-HIGH-VELOCITY GAS in the EXPANDING MOLECULAR SHELL ADJACENT to the W44 SUPERNOVA REMNANT

Yamada, M., Oka, T., Takekawa, S., Iwata, Y., Tsujimoto, S., Tokuyama, S., Furusawa, M., Tanabe, K. & Nomura, M., 2017 Jan 1, In : Astrophysical Journal Letters. 834, 1, L3.

Research output: Contribution to journalArticle

kinetic energy
telescopes
shell
erg
observatory
16 Citations (Scopus)

Millimetre-wave emission from an intermediate-mass black hole candidate in the Milky Way

Oka, T., Tsujimoto, S., Iwata, Y., Nomura, M. & Takekawa, S., 2017 Oct 1, In : Nature Astronomy. 1, 10, p. 709-712 4 p.

Research output: Contribution to journalArticle

millimeter waves
kinematics
Milky Way Galaxy
galaxies
continuums
5 Citations (Scopus)

PHYSICAL CONTACT between the +20 km s-1 CLOUD and the GALACTIC CIRCUMNUCLEAR DISK

Takekawa, S., Oka, T. & Tanaka, K., 2017 Jan 10, In : Astrophysical Journal. 834, 2, 121.

Research output: Contribution to journalArticle

radio
chemical property
cavity
observatory
collision
2016

Caravan-Submm, Black Hole Imager in the Andes

Miyoshi, M., Kasuga, T., Iba, J. K. I., Oka, T., Sekido, M., Takefuji, K., Takahashi, M., Saida, H. & Takahashi, R., 2016, In : Advances in Astronomy. 2016, 8306494.

Research output: Contribution to journalArticle

interferometer
accretion
wavelength
accretion disks
gravitational fields

Kinematics of the Ultra-High-Velocity Gas in the Expanding Molecular Shell Adjacent to the W44 Supernova Remnant

Yamada, M., Oka, T., Tanaka, K., Nomura, M., Takekawa, S., Iwata, Y., Tokuyama, S., Tanabe, K., Tsujimoto, S. & Furusawa, M., 2016, In : Proceedings of the International Astronomical Union. 11, p. 151-153 3 p.

Research output: Contribution to journalArticle

supernova remnants
kinematics
gases

Physical contact between the +20 km s-1 cloud and the galactic circumnuclear disk

Takekawa, S., Oka, T. & Tanaka, K., 2016, In : Proceedings of the International Astronomical Union. 11, p. 145-146 2 p.

Research output: Contribution to journalArticle

radio
cavity
observatory
collision
accretion

Possible Detection of Quasi-Periodic Oscillations from Sgr A∗ at 43 GHz

Iwata, Y., Oka, T. & Miyoshi, M., 2016, In : Proceedings of the International Astronomical Union. 11, p. 50-51 2 p.

Research output: Contribution to journalArticle

oscillation
oscillations
Very Long Baseline Array (VLBA)
flares
millimeter waves

Signature of an intermediate-mass black hole in the central molecular zone of our galaxy

Oka, T., Mizuno, R., Miura, K. & Takekawa, S., 2016, In : Proceedings of the International Astronomical Union. 11, p. 119-122 4 p.

Research output: Contribution to journalArticle

signatures
galaxies
radio telescopes
void ratio
molecular clouds
22 Citations (Scopus)

SIGNATURE of AN INTERMEDIATE-MASS BLACK HOLE in the CENTRAL MOLECULAR ZONE of OUR GALAXY

Oka, T., Mizuno, R., Miura, K. & Takekawa, S., 2016 Jan 1, In : Astrophysical Journal Letters. 816, 1, L7.

Research output: Contribution to journalArticle

radio
radio telescopes
void ratio
molecular clouds
wings
1 Citation (Scopus)

Statistical study of high-velocity compact clouds based on the complete co imagings of the central molecular zone

Tokuyama, S., Oka, T., Takekawa, S., Yamada, M., Iwata, Y. & Tsujimoto, S., 2016, In : Proceedings of the International Astronomical Union. 11, p. 154-155 2 p.

Research output: Contribution to journalArticle

2015
4 Citations (Scopus)

CO-0.30-0.07: A PECULIAR MOLECULAR CLUMP with AN EXTREMELY BROAD VELOCITY WIDTH in the CENTRAL MOLECULAR ZONE of the MILKY WAY

Tanaka, K., Nagai, M., Kamegai, K. & Oka, T., 2015 Jun 10, In : Astrophysical Journal. 806, 1, 130.

Research output: Contribution to journalArticle

clumps
ridges
shock
parabolic reflectors
energy sources
2014

3 mm band line survey toward the high-velocity compact cloud CO-0.40-0.22

Oka, T., Tanaka, K., Matsumura, S., Miura, K., Takekawa, S., Takahata, Y. & Nishino, A., 2014, In : Proceedings of the International Astronomical Union. 9, S303, p. 202-204 3 p.

Research output: Contribution to journalArticle

shock
velocity structure
profiles
molecular clouds
compression

Daily monitor of Sagittarius A* at 22 GHz with the Japanese VLBI Network

Tsuboi, M., Asaki, Y., Yonekura, Y., Miyamoto, Y., Kaneko, H., Seta, M., Nakai, N., Kameya, O., Miyoshi, M., Takaba, H., Wakamatsu, K., Fukuzaki, Y., Morimitsu, T., Uehara, K., Sekido, M., Oka, T., Takekawa, S., Omodaka, T., Handa, T. & Takumi, A., 2014, In : Proceedings of the International Astronomical Union. 9, S303, p. 382-384 3 p.

Research output: Contribution to journalArticle

very long base interferometry
very long baseline interferometry
monitors
flux density
accretion disks

Flux monitoring observations of Sgr A* at 8 GHz and 2 GHz with the NICT Kashima-Koganei VLBI system

Takekawa, S., Oka, T. & Sekido, M., 2014, In : Proceedings of the International Astronomical Union. 9, S303, p. 330-332 3 p.

Research output: Contribution to journalArticle

very long base interferometry
very long baseline interferometry
monitoring
flux density
accretion disks
6 Citations (Scopus)

High velocity compact clouds in the sagittarius C region

Tanaka, K., Oka, T., Matsumura, S., Nagai, M. & Kamegai, K., 2014 Mar 1, In : Astrophysical Journal. 783, 1, 62.

Research output: Contribution to journalArticle

erg
shell
kinetic energy
collision
collisions
2 Citations (Scopus)

Millimeter-wave molecular line observations of the tornado nebula

Sakai, D., Oka, T., Tanaka, K., Matsumura, S., Miura, K. & Takekawa, S., 2014 Aug 10, In : Astrophysical Journal. 791, 1, 49.

Research output: Contribution to journalArticle

tornadoes
tornado
nebulae
millimeter waves
radio
8 Citations (Scopus)

Millimeter-wave spectral line surveys toward the galactic circumnuclear disk and Sgr A

Takekawa, S., Oka, T., Tanaka, K., Matsumura, S., Miura, K. & Sakai, D., 2014 Sep 1, In : Astrophysical Journal, Supplement Series. 214, 1, 2.

Research output: Contribution to journalArticle

millimeter waves
line spectra
molecular clouds
radio
recombination
2013
15 Citations (Scopus)

Kinematics of shocked molecular gas adjacent to the supernova remnant W44

Sashida, T., Oka, T., Tanaka, K., Aono, K., Matsumura, S., Nagai, M. & Seta, M., 2013 Sep 1, In : Astrophysical Journal. 774, 1, 10.

Research output: Contribution to journalArticle

supernova remnants
molecular gases
kinematics
wings
gas
2012
28 Citations (Scopus)

ASTE CO J = 3-2 survey of the galactic center

Oka, T., Onodera, Y., Nagai, M., Tanaka, K., Matsumura, S. & Kamegai, K., 2012 Aug, In : Astrophysical Journal, Supplement Series. 201, 2, 14.

Research output: Contribution to journalArticle

molecular gases
gas
high temperature gases
clumps
massive stars
4 Citations (Scopus)

Discovery of the pigtail molecular cloud in the galactic center

Matsumura, S., Oka, T., Tanaka, K., Nagai, M., Kamegai, K. & Hasegawa, T., 2012 Sep 1, In : Astrophysical Journal. 756, 1, 87.

Research output: Contribution to journalArticle

molecular clouds
orbits
nebulae
wings
tubes
2011
37 Citations (Scopus)

A new look at the galactic circumnuclear disk

Oka, T., Nagai, M., Kamegai, K. & Tanaka, K., 2011 May 10, In : Astrophysical Journal. 732, 2, 120.

Research output: Contribution to journalArticle

gas
molecular gases
gradient analysis
molecular clouds
rings
14 Citations (Scopus)

High atomic carbon abundance in molecular clouds in the Galactic center region

Tanaka, K., Oka, T., Matsumura, S., Nagai, M. & Kamegai, K., 2011 Dec 20, In : Astrophysical Journal Letters. 743, 2, L39.

Research output: Contribution to journalArticle

molecular clouds
dissociation
gradient analysis
carbon
chemical evolution
3 Citations (Scopus)

Suzaku discovery of twin thermal plasma from the Tornado nebula

Sawada, M., Go Tsuru, T., Koyama, K. & Oka, T., 2011 Nov 25, In : Publications of the Astronomical Society of Japan. 63, SPEC. ISSUE 3

Research output: Contribution to journalArticle

tornadoes
thermal plasmas
tornado
nebulae
plasma
94 Citations (Scopus)

Wild at Heart: The particle astrophysics of the Galactic Centre

Crocker, R. M., Jones, D. I., Aharonian, F., Law, C. J., Melia, F., Oka, T. & Ott, J., 2011 May, In : Monthly Notices of the Royal Astronomical Society. 413, 2, p. 763-788 26 p.

Research output: Contribution to journalArticle

astrophysics
cosmic rays
cosmic ray
haze
supernovae
2009
2 Citations (Scopus)

A chain of dark clouds in projection against the galactic center

Nagayama, T., Sato, S., Nishiyama, S., Murai, Y., Nagata, T., Hatano, H., Kurita, M., Tamura, M., Nakajima, Y., Sugitani, K., Oka, T. & Sofue, Y., 2009 Apr 25, In : Publications of the Astronomical Society of Japan. 61, 2, p. 283-290 8 p.

Research output: Contribution to journalArticle

projection
stars
H II regions
color

An earliest black hole imager at andes

Miyoshi, M., Furuya, R. S., Kawaguchi, N., Nakajima, J., Irimajiri, Y., Koyama, Y., Sekido, M., Ujihara, H., Ishitsuka, K. J. I., Asaki, Y., Kato, Y., Takeuchi, H., Tsuboi, M., Kasuga, T., Tomimatsu, A., Takahashi, M., Eriguchi, Y., Yoshida, S., Koide, S., Takahashi, R. & 1 others, Oka, T., 2009, Proceedings of the 19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009. p. 235-238 4 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

event horizon
very long base interferometry
parabolic reflectors
planning
stations
14 Citations (Scopus)

Large expanding molecular arc in the Sagittarius Bl complex

Tanaka, K., Oka, T., Nagai, M. & Kamegai, K., 2009, In : Publications of the Astronomical Society of Japan. 61, 3, p. 461-469 9 p.

Research output: Contribution to journalArticle

kinetic energy
arcs
clumps
supernovae
explosions
2008

A high-velocity [CI] wing emission toward the M17 molecular cloud

Nagai, M., Oka, T., Yamamoto, S., Moriguchi, Y., Fukui, Y. & Sekimoto, Y., 2008 Jan 1, In : Astrophysics and Space Science Proceedings. 202419, 1 p.

Research output: Contribution to journalConference article

molecular clouds
wings
16 Citations (Scopus)

Aperture synthesis imaging of a high-velocity compact cloud near the galactic center

Oka, T., Hasegawa, T., White, G. J., Sato, F., Tsuboi, M. & Miyazaki, A., 2008, In : Publications of the Astronomical Society of Japan. 60, 3, p. 429-434 6 p.

Research output: Contribution to journalArticle

apertures
clumps
synthesis
arcs
molecular clouds

Atomic carbon in the southern galactic plane

Kamegai, K., Oka, T., Hayashida, M., Nagai, M., Ikeda, M., Kuboi, N., Tanaka, K., Bronfman, L. & Yamamoto, S., 2008 Jan 1, In : Astrophysics and Space Science Proceedings. 202419, 1 p.

Research output: Contribution to journalConference article

Carbon
carbon
2007
49 Citations (Scopus)

A CO J = 3-2 survey of the galactic center

Oka, T., Nagai, M., Kamegai, K., Tanaka, K. & Kuboi, N., 2007, In : Publications of the Astronomical Society of Japan. 59, 1, p. 15-23 9 p.

Research output: Contribution to journalArticle

molecular gases
gases
gas
submillimeter waves
threads
25 Citations (Scopus)

High-resolution mappings of the l =1.3 complex in molecular lines: Discovery of a proto-superbubble

Tanaka, K., Kamegai, K., Nagai, M. & Oka, T., 2007, In : Publications of the Astronomical Society of Japan. 59, 2, p. 323-333 11 p.

Research output: Contribution to journalArticle

shell
high resolution
telescopes
gas
kinetic energy
6 Citations (Scopus)

Physical and chemical properties of massive clumps in the AFGL 333 cloud

Sakai, T., Oka, T. & Yamamoto, S., 2007 Jun 20, In : Astrophysical Journal. 662, 2 I, p. 1043-1051 9 p.

Research output: Contribution to journalArticle

clumps
chemical properties
chemical property
physical property
physical properties
26 Citations (Scopus)

Physical conditions of molecular gas in the galactic center

Nagai, M., Tanaka, K., Kamegai, K. & Oka, T., 2007, In : Publications of the Astronomical Society of Japan. 59, 1, p. 25-31 7 p.

Research output: Contribution to journalArticle

molecular gases
gas density
gas
telescopes
kinetics
2006
1 Citation (Scopus)

A large-scale CO J=3-2 survey of the galactic center

Oka, T., Nagai, M., Kamegai, K. & Tanaka, K., 2006 Dec 1, In : Journal of Physics: Conference Series. 54, 1, p. 67-71 5 p., 012.

Research output: Contribution to journalArticle

molecular gases
gases
submillimeter waves
threads
high temperature gases
14 Citations (Scopus)

Atomic carbon in the AFGL 333 cloud

Sakai, T., Oka, T. & Yamamoto, S., 2006 Sep 20, In : Astrophysical Journal. 649, 1 I, p. 268-279 12 p.

Research output: Contribution to journalArticle

carbon
molecular clouds
telescopes
submillimeter waves
star formation

Physical and chemical properties of the AFGL 333 cloud

Sakai, T., Oka, T. & Yamamoto, S., 2006 Aug, In : Proceedings of the International Astronomical Union. 2, S237, p. 471 1 p.

Research output: Contribution to journalArticle

chemical properties
Chemical properties
Stars
chemical property
Physical properties
2005
13 Citations (Scopus)

Atomic carbon in the southern milky way

Oka, T., Kamegai, K., Hayashida, M., Nagai, M., Ikeda, M., Kuboi, N., Tanaka, K., Bronfman, L. & Yamamoto, S., 2005 Apr 20, In : Astrophysical Journal. 623, 2 I, p. 889-896 8 p.

Research output: Contribution to journalArticle

longitude
carbon
gradient analysis
submillimeter waves
neutral gases
2004
36 Citations (Scopus)

Detection of shocked molecular gas by full-extent mapping of the supernova remnant W44

Seta, M., Hasegawa, T., Sakamoto, S., Oka, T., Sawada, T., Inutsuka, S. I., Koyama, H. & Hayashi, M., 2004 Feb, In : Astronomical Journal. 127, 2 1778, p. 1098-1116 19 p.

Research output: Contribution to journalArticle

supernova remnants
molecular gases
radio
blasts
clumps

Observational approach to molecular cloud evolution

Oka, T. & Yamamoto, S., 2004, In : Advances in Space Research. 34, 3, p. 519-523 5 p.

Research output: Contribution to journalArticle

molecular clouds
Telescopes
Photodissociation
Submillimeter waves
telescopes
9 Citations (Scopus)

Submillimeter-wave C I spectral lines from the NGC 1333 region

Oka, T., Iwata, M., Maezawa, H., Ikeda, M., Ito, T., Kamegai, K., Sakai, T. & Yamamoto, S., 2004 Feb 20, In : Astrophysical Journal. 602, 2 I, p. 803-815 13 p.

Research output: Contribution to journalArticle

submillimeter waves
line spectra
shell
reflection nebulae
stars
2003
23 Citations (Scopus)

Distribution of the [C I] emission in the ρ Ophiuchi dark cloud

Kamegai, K., Ikeda, M., Maezawa, H., Ito, T., Iwata, M., Sakai, T., Oka, T., Yamamoto, S., Sekimoto, Y., Tatematsu, K., Noguchi, T., Saito, S., Fujiwara, H., Ozeki, H., Inatani, J. & Ohishi, M., 2003 May 20, In : Astrophysical Journal. 589, 1 I, p. 378-385 8 p.

Research output: Contribution to journalArticle

photodissociation
spatial distribution
submillimeter waves
chemical evolution
distribution

Gravitational Stability of Molecular Clouds in the Galactic Center

Oka, T. & Hasegawa, T., 2003 Sep, In : Astronomische Nachrichten. 324, SUPPL.1, p. 101-107 7 p.

Research output: Contribution to journalArticle

molecular clouds
gravitational instability
crowding
star formation
ridges
2002
59 Citations (Scopus)

The distribution of atomic carbon in the Orion giant molecular cloud 1

Ikeda, M., Oka, T., Tatematsu, K., Sekimoto, Y. & Yamamoto, S., 2002 Apr 1, In : Astrophysical Journal, Supplement Series. 139, 2, p. 467-485 19 p.

Research output: Contribution to journalArticle

molecular clouds
carbon
submillimeter waves
velocity structure
massive stars
2001
20 Citations (Scopus)

A hyperenergetic CO shell in the Galactic center molecular cloud complex

Oka, T., Hasegawa, T., Sato, F., Tsuboi, M. & Miyazaki, A., 2001 Oct 25, In : Publications of the Astronomical Society of Japan. 53, 5, p. 787-791 5 p.

Research output: Contribution to journalArticle

molecular clouds
shell
kinetic energy
supernovae
explosions