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Radio Astronomy Area

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Assistant Professor    Araki, Hiroshi

Research Field
Planetary Science,APlanetary Geodesy
Brief Introduction of research
My research activity is around the lunar and planetary geodesy or geomorphology, especially to investigate the internal structure of planetary bodies in the solar system and to contribute to understand the origin and evolution of our solar system bodies. I had been PI of laser altimeter (LALT) on Japanese lunar orbiter KAGUYA for 7 years and confirmed that lunar crust is more rigid than had been recognized on the analysis of lunar laser topography by LALT. I am now involved in the development of new corner reflector on the Moon for Lunar Laser Ranging and “In situ Lunar Orientation Measurement” telescope for the investigation of deeper lunar internal structure, and also concerned with laser altimeter(LIDAR) mission on HAYABUSA-2 and laser altimeter(GALA) development of JUICE (Jupiter Icy moon Explorer; ESA) project.
Contact us
E-mail: araki.hiroshi[at]nao.ac.jp
http://www.miz.nao.ac.jp/rise/en/members/hiroshi-araki

Associate Professor    Espada, Daniel

Research Field
Extragalactic Research: Galaxy evolution, Star Formation and AGNs
Brief Introduction of research
My main research interests include the role of the environment on galaxy evolution, the laws of star formation from molecular gas, as well as the gas feeding mechanisms in Active Galactic Nuclei.
I investigate the properties of the interstellar medium in its molecular and atomic phase using radio telescopes such as the Atacama Large Millimeter/submillimeter Array (ALMA) and Karl G. Jansky Very Large Array (JVLA). I currently work in the ALMA project at the East Asian ALMA Regional Center in Mitaka.
Contact us
E-mail: daniel.espada[at]nao.ac.jp

Assistant Professor    Gonzalez, Alvaro

Research Field
Instrumentation and antennas for radio astronomy
Brief Introduction of research
My professional interest is the design, analysis and characterization of mm and sub-mm wave heterodyne receivers and antennas for radio astronomy. I am particularly interested in receiver optics and waveguide component design, as well as in full system considerations. I have contributed to the development of several ALMA receivers, at NAOJ and in collaboration with other international institutes.
Contact us
E-mail: Alvaro.Gonzalez[at]nao.ac.jp
https://www.researchgate.net/profile/Alvaro_Gonzalez18

Assistant Professor    Hada, Kazuhiro

Research Field
Radio astronomy, High energy astrophysics, Very-long-baseline-interferometer (VLBI), Active Galactic Nuclei, Relativistic jets
Brief Introduction of research
Active Galactic Nuclei (AGN) are the most energetic phenomena in the Universe. They are ultimately powered by the central accreting supermassive black holes, and exhibit various high-energy activities such as powerful relativistic jets. I am working on observational studies of such energetic structures in AGN using the VLBI technique, which allows us to resolve and probe the immediate vicinity of the central black holes at an unprecedented high angular resolution. I am also working on the promotion of next-generation international VLBI facilities such as East-Asian VLBI Network and Event Horizon Telescope.
Contact us
E-mail: kazuhiro.hada[at]nao.ac.jp
http://www.miz.nao.ac.jp/en

Associate Professor    Hanada, Hideo

Research Field
Planetary geodesy
Brief Introduction of research
I want to know the internal structure of the moon and the planets in order to elucidate the origin and evolution of them. I am mainly interested in geodetic phenomena such as gravity fields, tidal variations and rotational fluctuations as tools for the investigation of the internal structure, and I have been developed new geodetic methods and instruments for their observations. Recently, I was engaged in VLBI (Very Long Baseline Interferometer) observation of two radio sources onboard the sub-satellites in Kaguya mission, and I proceeded investigation of the gravity fields of the Moon and development of the instruments onboard the spacecraft. The next target is the investigation of rotation of the moon and the planets.
Contact us
E-mail: hideo.hanada[at]nao.ac.jp
http://www.miz.nao.ac.jp/rise/top

Professor    Hayashi, Masahiko

Research Field
Radio Astronomy, Infrared Astronomy
Brief Introduction of Research
Observational studies of star and planetary system formation
Contact us
E-mail: daicho[at]nao.ac.jp
http://jouhoukoukai.nao.ac.jp/reslist/res.aspx?ID=172

Assistant Professor    Hiramatsu, Masaaki

Research Field
Radio astronomy, star formation
Brief Introduction of research
By observing millimeter/submillimeter waves I study the formation process of low-mass stars and physical environments of molecular clouds. Especially I am interested in the earliest phase of star formation, very low luminosity objects (VeLLOs), and the origin of the Initial Mass Function. I have observed several star forming regions such as Chamaeleon and Perseus with ASTE, Nobeyama 45m, SMT, and SMA.
Along with the astronomy research, as a Public Outreach Officer of the NAOJ ALMA Project, I engage in astronomy outreach and science communication activities. Establishing evaluation methods for such activities is my another interest.
Contact us
E-mail: hiramatsu.masaaki[at]nao.ac.jp
http://www.chamaeleon.jp/

Assistant Professor    Hirota, Tomoya

Research Field
Radio Astronomy,Astrometry,Astrochemistry
Brief Introduction of research
I am studying star-formation processes, Galactic structure, and interstellar chemistry by observing radio molecular lines and masers using radio telescopes, in particular radio interferometers (e.g. ALMA) and very long baseline interferometer (e.g. VERA). Current research interests are distance measurements of star-forming regions via VLBI astrometry of maser sources, measurements of 3D dynamical structures of molecular clouds and disk/jet systems of young stellar objects, search for interstellar molecules, observational studies of chemical compositions/processes and their evolution in molecular clouds, and new sciences with millimeter/submillimeter masers.
Contact us
http://veraserver.mtk.nao.ac.jp/index-J.html

Professor    Honma, Mareki

Research Field
Galactic structure, black holes, high resolution astronomy with VLBI
Brief Introduction of research
I have been working on VERA (VLBI Exploration of Radio Astrometry) project, which aims at revealing the 3-D structure of the Milky Way Galaxy based on VLBI astrometry of Galactic maser sources. I am also promoting mm and sub-mm VLBI observations to obtain radio images of nearby super-massive black holes (such as Sgr A* and M87) with the highest angular resolution ever achieved, in hope of detecting black hole shadows as the ultimate confirmation of existence of super-massive black holes in the universe.
Contact us
E-mail: mareki.honma[at]nao.ac.jp
http://veraserver.mtk.nao.ac.jp/VERA/honma/index.htm (in Japanese)

Professor    Iguchi, Satoru

Research Field
Radio Astronomy, Galaxy Formation, Black Hole, Interferometry
Brief Introduction of research
In galaxy formation, it is believed that a giant galaxy is formed as a consequence of numerous galaxy mergers.
Almost all galactic centers are assumed to contain a massive black hole, but we have yet to unveil its growth process and also how it relates to the evolution of a galaxy.
The supervisor promotes observational study of active galactic nuclei (AGNs), black holes, binary black holes, and their surrounding physics (e.g. jets, plasma disks, and molecular gas tori) focusing on the coevolution of a massive black hole and a galaxy.
In radio interferometry research, the supervisor studies antenna, receiver, analog device, analog-digital converter, high-speed data transmitter, reference signal generator/stabilizing calibrator, digital device, and the image analysis and calibration methods in aperture synthesis, and carries out the detailed design and development of these radio interferometer subsystems, as well as the design and optimization of the entire system of a radio telescope.
Also, he is engaged in the research of the interferometry and aperture synthesis, leading to the planning of the next generation interferometer project to explore and directly image the “2nd Earth”.
Contact us
E-mail: s.iguchi[at]nao.ac.jp
http://alma-intweb.mtk.nao.ac.jp/~iguchi/english.html

Associate Professor    Iono, Daisuke

Research Field
Colliding and merging galaxies. U/LIRGs. Submm Galaxies. Radio Astronomy
Brief Introduction of research
I study colliding and merging galaxies all over the universe -- in the nearby quiescent universe to the more rapidly evolving epoch of the early ages of the universe. The distant population is often ~10 times brighter than the local population, forming stars at a much higher rate. While the early universe is extremely interesting, my general idea is that one needs to understand the phenomenon in the local universe first, before trying to understand merging galaxies in the distant universe. The main tool I use is a radio telescope, both single dish and interferometers. I am also the East Asian Project Scientist for the ALMA project.
Contact us
E-mail: d.iono[at]nao.ac.jp
http://alma.mtk.nao.ac.jp/~diono

Assistant Professor    Jike, Takaaki

Research Field
Space geodesy, solid geo-science
Brief Introduction of research
Research on improvement in accuracy of geodetic VLBI.
Development of the geodetic VLBI technique and analysis of a new generation.
Contact us
E-mail: Takaaki.jike[at]nao.ac.jp

Professor    KAMENO, Seiji

Research Field
Radio Astronomy,Active Galactic Nuclei,System Engineering
Brief Introduction of research
Active Galactic Nuclei (AGNs) are powered by accretion matter onto a supermassive black hole. While the mass accretion is a key process to control AGN’s activity, it is poorly understood. I am promoting observational approaches to quest the origin of accretion matter and the mechanism to transfer angular momentum. Radio interferometry offers high-resolution imaging capability for this study. As a system verification scientist of ALMA, I am also developing methods to improve accuracy and efficiency of radio interferometry.
Contact us
E-mail: seiji.kameno[at]nao.ac.jp or skameno[at]alma.cl
http://www.alma.cl/~skameno/
http://milkyway.sci.kagoshima-u.ac.jp/~kameno/

Professor    Kobayashi, Hideyuki

Research Field
Radio Astronomy, VLBI
Brief Introduction of research
We are conducting a research of radio astrometry by using Very Long Baseline Interferometer, VLBI. VERA system has 2300 km baseline VLBI in Japan with a dual beam system, which is for a phase referencing VLBI and achieves 10 micro-arc-second accuracy. Our main science goal is to reveal the structure and dynamics of our Galaxy by the parallax and proper motion measurements of Galactic maser sources. Also we are conducting the organization and research of the East Asian VLBI network.
Contact us

Assistant Professor    Kono, Yusuke

Research Field
Radio Astronomy, VLBI
Brief Introduction of research
He has been involved with the design, fabrication and testing of several radio telescopes. He also participated in VSOP and VSOP2 project. He conducted the development of observation system of VSOP2 satellite.
Contact us
E-mail:kono.yusuke[at]nao.ac.jp
http://www.miz.nao.ac.jp

Assistant Professor    Matsuda, Yuichi

Research Field
Observational Astronomy
Brief Introduction of research
Our research interest is the connection between galaxy formation and the large-scale structure. We use the Subaru, Keck, VLT, JCMT, SMA, UKIRT, and Herschel space telescopes, to study galaxy / large-scale structure formation processes in the early universe.
Contact us
E-mail: yuichi.matsuda[at]nao.ac.jp

Associate Professor    Matsumoto, Koji

Research Field
Planetary geodesy
Brief Introduction of research
Satellite orbit determination by combining Doppler data with VLBI data.
Lunar gravity field modeling using satellite tracking data.
Simulation study of estimating lunar internal structure for future missions.
Contact us
http://www.miz.nao.ac.jp/rise/en/

Associate Professor    Matsuo, Hiroshi

Research Field
Radio Astronomy
Millimeter, Submillimeter and Terahertz instrumentations
Brief Introduction of research
Research activities include developments of astronomical instruments in millimeter, submillimeter and terahertz observations, such as superconducting tunnel junction detectors, cryogenic readout electronics and observing technologies such as photon counting terahertz interferometry. Past development programs include instrumentation for NRO 45m, ASTE, ALMA and AKARI infrared satellites. Astronomical observing programs include cosmic microwave background, distant galaxies and clusters of galaxies as well as high-mass star-forming regions.
Contact us
E-mail: h.matsuo[at]nao.ac.jp
http://thz-www.mtk.nao.ac.jp/index.html

Associate Professor    Nagai, Hiroshi

Research Field
Radio Astronomy, Active Galactic Nuclei, High Energy Astrophysics
Brief Introduction of research
Relativistic jets emanating from the super massive black hole at the center of galaxies are the subject of extensive studies at multi messengers. Radio observations enable us to probe the jets in close vicinity of the black hole using VLBI technique with very high angular resolution and highlight the accretion flow feeding the black hole using millimeter and submillimeter interferometry such as ALMA. With these instruments, I am challenging to uncover the jet production mechanism in connection with the multi-wavelength emission and properties of accretion flow.
Contact us
E-mail: hiroshi.nagai[at]nao.ac.jp
http://alma-intweb.mtk.nao.ac.jp/~nagai/index_e.html

Associate Professor    Nakanishi, Kouichiro

Research Field
galaxies, radio telescopes
Brief Introduction of research
My major interest in astronomy is starburst galaxies at local universe and high redshift. I’m involved in ALMA commissioning and science verification activities at Chile.
Contact us

Professor    Namiki, Noriyuki

Research Field
Planetary Sciences
Brief Introduction of research
I am studying the interior and evolution of planetary and satellite bodies. The planet whose interior and evolution have been most understood is, needless to say, the Earth. The Earth consists of crust, mantle, and outer and inner core. And a style of heat transfer from the deep interior to the surface is governed by plate-tectonics. We used to believe that plate-tectonics is the most efficient way of cooling, therefore should be common in other planetary bodies. Surprisingly, however, planetary explorations have revealed that no planetary body except this planet shows the signs of plate-tectonics. The key for this problem is the observation data derived from the future planetary explorations. For this purpose, I am working for analysis of lunar gravity/topography data, and development of laser altimeter of Hayabusa-2.
Contact us
E-mail: nori.namiki[at]nao.ac.jp
http://www.miz.nao.ac.jp/rise/top

Associate Professor    Shibata, Katsunori

Research Field
Radio Astronomy, VLBI, Evolved stars
Brief Introduction of research
Observational study of Evolved stars. Management of the operation of VLBI array called VERA (VLBI Exploration of Radio Astrometry). Development of operation software for VERA. Construction of VLBI network in the east Asia.
Contact us
E-mail: k.m.shibata[at]nao.ac.jp

Assistant Professor    Sunada, Kazuyoshi

Research Field
Radio Astronomy, Star & Planet formation, Astrometry, Galactic Astronomy, Receiver system
Brief Introduction of research
I am belonging to the VERA group.
I am investigating the massive star forming regions based on astrometry of maser sources.
I am also investigating the evolution of massive stars based on the far-IR database.
Contact us
E-mail: kazu.sunada[at]nao.ac.jp

Assistant Professor    Takahashi, Satoko

Research Field
Millimeter and submillimeter astronomy, Radio interferometry, Star formation
Brief Introduction of research
Studies of pre-stellar cores and protostellar cores are crucial to understand the major role of star formation, such as the formation of the first adiabatic core, outflow driving mechanisms, initial angular momentum distribution within the system, and mass accretion processes. They are closely related to formation and evolution of multiple-stellar system (including brown dwarf formation), disk and planet formation, and how the final stellar mass is set. My interest is to directly image the listed phenomena and observationally constrain formation and evolutionary processes of young stars and associated gas. In order to image the coldest and densest parts of molecular clouds and cores, where the majority of protostars form, I have been extensively using millimeter and submillimeter interferometers such as ALMA (Atacama Large Millimeter/submillimeter Array), SMA (Submillimeter Array), and JVLA (The Karl G. Jansky Very Large Array).
Contact us
E-mail: satoko.takahashi[at]nao.ac.jp

Professor    Tatematsu, Ken'ichi

Research Field
Radio Astronomy
Brief Introduction of research
Star Formation, Interstellar Medium,Submillimeter Astronomy, Radio Astromony
Contact us
E-mail: k.tatematsu[at]nao.ac.jp
http://alma.mtk.nao.ac.jp/~kt/kt-e.html

Assistant Professor    Tamura, Yoshiaki

Research Field
Geodesy(Earth Tides, Gravity, GNSS, VLBI)
Brief Introduction of research
Study of global geodynamics and crustal geodynamics.
By monitoring the Earth’s gravity change using superconducting gravimeters, and monitoring position changes using space techniques, we are studying active, deforming Earth.
Concerning VERA project, to establish “secure” coordinates in VERA network is the prior objective.
Contact us
E-mail: yoshiaki.tamura[at]nao.ac.jp

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