205 citations · 665 across the 24 of their papers we have counts for
24 papers
ALMA [CI] Image of the Circumnuclear Disk of the Milky Way: Inflowing Low-density Molecular Gas
Kunihiko Tanaka, Makoto Nagai, Kazuhisa Kamegai
We present ALMA [\ion{C}{1}]~-- imaging of the central region of the Galaxy encompassing the circumnuclear disk (CND). The data reveal lo…
Virtual ALMA Tour in VRChat: A Whole New Experience
Masaaki Hiramatsu, S_Asagiri, Stella. G. Amano +3
Many forefront observatories are located in remote areas and are difficult to visit, and the global pandemic made visits even harder. Several virtual tours have been executed on Yo…
Atomic Carbon in the Central Molecular Zone of the Milky Way : Possible Cosmic-ray Induced Chemistry or Time-Dependent Chemistry Associated with SNR Sagittarius A East
Kunihiko Tanaka, Makoto Nagai, Kazuhisa Kamegai
Being one of the most abundant atomic/molecular species observed in dense molecular gas, atomic carbon () is a potential good tracer of molecular gas mass in many che…
HCN =4-3, HNC =1-0, =1-0, and =10-9 Maps of Galactic Center Region II.: Physical Properties of Dense Gas Clumps and Probability of Star Formation
Kunihiko Tanaka, Makoto Nagai, Kazuhisa Kamegai +2
We report a statistical analysis exploring the origin of the overall low star formation efficiency (SFE) of the Galactic central molecular zone (CMZ) and the SFE diversity among th…
Observations and Analysis of Absorption Lines including J = K Rotational Levels of CH3CN: The Envelope of Sagittarius B2(M)
Mitsunori Araki, Shuro Takano, Nobuhiko Kuze +5
Molecules in diffuse and translucent clouds experience cooling as a result of radiation and less excitation from collisions. However, a rotation around a molecular axis of acetonit…
HCN =4-3, HNC =1-0, =1-0, and =10-9 Maps of Galactic Center Region I: Spatially-Resolved Measurements of Physical Conditions and Chemical Composition
Kunihiko Tanaka, Makoto Nagai, Kazuhisa Kamegai +2
This {\it supplement} paper presents the maps of HCN =4-3, HNC =1-0, =1-0, and HCN =10-9 for the Galactic central molecular zone (CMZ), which ha…
FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45-m telescope (FUGIN) I: Project Overview and Initial Results
Tomofumi Umemoto, Tetsuhiro Minamidani, Nario Kuno +41
The FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45-m telescope (FUGIN) project is one of the legacy projects using the new multi-beam FOREST receiver installed…
CO-0.30-0.07: A Peculiar Molecular Clump with an Extremely Broad Velocity Width
Kunihiko Tanaka, Makoto Nagai, Kazuhisa Kamegai +1
The high velocity dispersion compact cloud CO-0.30-0.07 is a peculiar molecular clump discovered in the central moleculr zone of the Milky Way, which is characterized by its extrem…
High Velocity Compact Clouds in the Sagittarius C Region
Kunihiko Tanaka, Tomoharu Oka, Shinji Matsumura +2
We report the detection of extremely broad emission toward two molecular clumps in the Galactic central molecular zone. We have mapped the Sagittarius C complex ($-0^\circ.61 < l <…
Measurements of Antenna Surface for a Millimeter-Wave Space Radio Telescope II; Metal Mesh Surface for Large Deployable Reflector
Kazuhisa Kamegai, Masato Tsuboi
Large deployable antennas with a mesh surface woven by fine metal wires are an important technology for communications satellites and space radio telescopes. However, it is difficu…
Discovery of the Pigtail Molecular Cloud in the Galactic Center
Shinji Matsumura, Tomoharu Oka, Kunihiko Tanaka +3
This paper reports the discovery of a helical molecular cloud in the central molecular zone (CMZ) of our Galaxy. This "pigtail" molecular cloud appears at (l, b, V_LSR) ~ (-0.7deg,…
High Atomic Carbon Abundance in Molecular Clouds in the Galactic Center Region
Kunihiko Tanaka, Tomoharu Oka, Shinji Matsumura +2
This letter presents a Nyquist-sampled, high-resolution [CI] 3P1-3P0 map of the -0.2 deg < l < 1.2 deg x -0.1 deg < b < 0 deg region in the Central Molecular Zone (CMZ) taken with…
Isolated Millimeter Flares of Cyg X-3
Masato Tsuboi, Kazuhisa Kamegai, Atsushi Miyazaki +2
Cygnus X-3 (Cyg X-3) is a well-known microquasar with relativistic jets. Cyg X-3 is especially famous for its giant radio outbursts, which have been observed once every few years s…
Measurements of Antenna Surface for Millimeter-Wave Space Radio Telescope
Kazuhisa Kamegai, Masato Tsuboi, Akihiro Doi +1
In the construction of a space radio telescope, it is essential to use materials with a low noise factor and high mechanical robustness for the antenna surface. We present the resu…
Detection of Strong Millimeter Emission from the Circumstellar Dust Disk Around V1094 Sco: Cold and Massive Disk around a T Tauri Star in a Quiescent Accretion Phase?
Takashi Tsukagoshi, Masao Saito, Yoshimi Kitamura +16
We present the discovery of a cold massive dust disk around the T Tauri star V1094 Sco in the Lupus molecular cloud from the 1.1 millimeter continuum observations with AzTEC on AST…
The ASTE Galactic Center CO J=3-2 Survey: Probing Shocked Molecular Gas in the CMZ
Tomoharu Oka, Kunihiko Tanaka, Shinji Matsumura +3
Large-scale CO surveys have revealed that the central molecular zone (CMZ) of our Galaxy is characterized by a number of expanding shells/arcs, and by a peculiar population of comp…
A Molecular Line Observation toward Massive Clumps Associated with Infrared Dark Clouds
Takeshi Sakai, Nami Sakai, Kazuhisa Kamegai +4
We have surveyed the N2H+ J=1-0, HC3N J=5-4, CCS J_N=4_3-3_2, NH3 (J, K) = (1, 1), (2, 2), (3, 3), and CH3OH J=7-6 lines toward the 55 massive clumps associated with infrared dark…
ASTE Submillimeter Observations of a Young Stellar Object Condensation in Cederblad 110
Masaaki Hiramatsu, Takahiro Hayakawa, Ken'ichi Tatematsu +5
We present results of submillimeter observations of a low-mass young stellar objects (YSOs) condensation in the Cederblad 110 region of the Chamaeleon I dark cloud with Atacama Sub…
A Search for CO(J=3-2) Emission from the Host Galaxy of GRB 980425 with the Atacama Submillimeter Telescope Experiment
Bunyo Hatsukade, Kotaro Kohno, Akira Endo +14
We report on a deep search for CO(J=3-2) line emission from the host galaxy of GRB 980425 with the Atacama Submillimeter Telescope Experiment (ASTE). We observed five points of the…
Physical Conditions of Molecular Gas in the Galactic Center
Makoto Nagai, Kunihiko Tanaka, Kazuhisa Kamegai +1
We estimated physical conditions of molecular gas in the central molecular zone (CMZ) of the Galaxy, using our CO J=3-2 data obtained with the Atacama Submillimeter Telescope Exper…
High Resolution Mappings of the L=1.3 deg Complex in Molecular Lines : Discovery of a Proto-Superbubble
Kunihiko Tanaka, Kazuhisa Kamegai, Makoto Nagai +1
We report the results of molecular line observations toward the l=1.3 deg complex, ananomalous cloud complex in the central molecular zone of the Galaxy. We have taken high resolut…
A CO J=3-2 Survey of the Galactic Center
Tomoharu Oka, Makoto Nagai, Kazuhisa Kamegai +2
We have surveyed the central molecular zone (CMZ) of our Galaxy in the CO J=3-2 line with the Atacama Submillimeter-wave Telescope Experiment (ASTE). Molecular gas in the Galactic…
ASTE CO(3-2) Observations of the Barred Spiral Galaxy M 83: I. Correlation between CO(3-2)/CO(1-0) Ratios and Star Formation Efficiencies
Kazuyuki Muraoka, Kotaro Kohno, Tomoka Tosaki +14
We present CO(J=3-2) emission observations with the Atacama Submillimeter Telescope Experiment (ASTE) toward the 5' x 5' (or 6.6 x 6.6 kpc at the distance D = 4.5 Mpc) region of th…
Atomic Carbon and CO Isotope Emission in the Vicinity of DR15
T. Oka, S. Yamamoto, M. Iwata +17
We present observations of the 3P1-3P0 fine structure transition of atomic carbon [CI], the J=3-2 transition of CO, as well as of the J=1-0 transitions of 13CO and C18O toward DR15…