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Basic Astronomy Area

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Associate Professor    Agata, Hidehiko

Research Field
Science Education, Science Communication
Brief Introduction of Research
I study science education, science communication and public relations in Public Relations Center(PRC), NAOJ.
PRC was created in 1998 to share the latest research results of astronomy with the public. We communicate and promote research breakthroughs in a manner that is understandable, relevant, and exciting. For this purpose, we over a range of services and deliver amazing scientific information through a variety of media including the Web and scientific readings. We also have built an effective partnership with dissemination experts working for public observatories, science museums, and planetariums.
Contact us
E-mail: h.agata[at]nao.ac.jp
http://prc.nao.ac.jp/prc/
http://prc.nao.ac.jp/ashub/en/index.html

Assistant Professor    Akutsu, Tomotada

Research Field
Gravitational-wave Astronomy
Brief Introduction of Research
We are developing gravitational-wave telescopes for the first detection of gravitational waves, the ripples of spacetime predicted by the theory of general relativity, and aiming to create a new field, gravitational-wave astronomy.
Contact us
http://tamago.mtk.nao.ac.jp/
http://gwcenter.icrr.u-tokyo.ac.jp/

Professor    Fukushima, Toshio

Research Field
Astrometry, Celestial Mechanics, General Relativity, Geodesy, Numerical Analysis
Brief Introduction of Research
1.nbsp;nbsp;Newtonian and general relativistic theory of reference systems including, time, space, reference frame, unit system, and coordinate transformation.
2.nbsp;nbsp;General theory of orbital and rotational motion of celestial bodies.
3.nbsp;nbsp;Precise and fast computation of special functions for astrometry, celestial mechanics, and geodesy including the solution of Kepler's equations of various kinds, the solution of the latitude equation, the Jacobian elliptic functions, the incomplete and complete elliptic integrals of all kinds, the associated Legendre functions of the first and second kind, the oblate spheroidal harmonics, and Lambert W-function.
4.nbsp;nbsp;Efficient numerical integration methods of orbital and rotational dynamics including the method of manifold correction, generalized Encke's method, Picard-Chebyshev method, super-implicit method, and various parallel computation techniques.
Contact us
E-mail: Toshio.Fukushima[at]nao.ac.jp
https://www.researchgate.net/profile/Toshio_Fukushima/
http://pholus.mtk.nao.ac.jp/~toshio/

Associate Professor    Hara, Hirohisa

Research Field
Solar Physics, Astronomical Instrumentation
Brief Introduction of Research
Primary research interest is coronal-heating mechanism, magnetic-reconnection process, and magnetic-field generation in Solar Physics. The former two topics are being investigated with the Hinode EUV imaging spectrometer that we have recently developed with UK and US collaboration.
Contact us
E-mail: hirohisa.hara[at]nao.ac.jp
http://hinode.nao.ac.jp/user/harahs/index

Associate Professor    Hanaoka, Yoichiro

Research Field
Solar Physics
Brief Introduction of Research
Y. Hanaoka has been working on the observational solar physics targeting at the active phenomena on the solar surface. Recently he is mainly working on the development of advanced observational instruments for the ground-base optical solar observations to obtain higher-accuracy data.
Contact us
E-mail: hanaoka[at]solar.mtk.nao.ac.jp

Assistant Professor    Ito, Takashi

Research Field
Planetary science - solar system small bodies - asteroids
Brief Introduction of Research
Asteroid dynamics by numerical integrations; optical observation of new asteroid family; comparison of asteroid data and crater record on planets
Contact us
E-mail: tito[at]cfca.nao.ac.jp
http://www.cfca.nao.ac.jp/

Associate Professor    Kajino, Toshitaka

Research Field
Cosmology and Nuclear Astrophysics
Brief Introduction of Research
Our research topics include the following subjects in cosmology and theoretical astrophysics: Big-Bang cosmology, cosmic phase transition and creation of elementary particles and element genesis, origin of dark matter (DM) and dark energy (DE), roles of DM and DE in cosmic structure formation and CMB anisotropies, explosion mechanism of supernovae and gamma-ray bursts, and nucleosynthesis of heavy elements, neutrino astrophysics, etc. Active national and international collaborations are being carried on among interdisciplinary sciences of astronomy, astrophysics, cosmology, particle and nuclear physics, meteoritic science, plasma physics, and many other communities both theoretically, observationally and experimentally.
Contact us
http://th.nao.ac.jp/MEMBER/kajino/

Associate Professor    Kano, Ryouhei

Research Field
Solar Physics, Solar Instrumentation
Brief Introduction of Research
I have been working on the observational solar physics, and mainly using X-ray or EUV data taken by satellites (e.g. Hinode) or rocket experiments for the Sun. My primary research interest is the coronal heating mechanism, which is the interactions between coronal plasma and magnetic fields. I also have been working on the development of new solar instruments (e.g. X-Ray Telescope in Hinode, and the CLASP rocket experiment).
Contact us
E-mail:ryouhei.kano[at]nao.ac.jp
URL:(not in English)

Assistant Professor    Kubo, Masahito

Research Field
Solar physics
Brief Introduction of Research
My research interests focus on formation and dissipation processes of solar magnetic fields. There are various types and scales of magnetic field structures on the Sun, and most prominent one is a sunspot. Such magnetic structures often generate active phenomena as result of interaction with plasma flows. The Sun is a unique star in which magnetic field structures and granulations can be resolved observationally. The detailed observations of interactions between magnetic fields and plasma flows are essential for understanding the magneto-hydrodynamic phenomena. In addition to analysis of magnetic fields measured by the Hinode satellite or ground-based instruments, the development of new instruments (the sounding rocket experiment “CLASP” and the next space solar mission“SOLAR-C”) is also my main research topic.
Contact us

Assistant Professor    Kojima Takafumi

Research Field
High frequency electronics for radio astronomy
Brief Introduction of Research
Development of super-terahertz and multi-beam heterodyne receivers for the Atacama Large Millimeter/submillimeter Array. Development of cryogenic low-noise amplifiers at microwave and millimeter-wave frequencies.
Contact us
E-mail: t.kojima[at]nao.ac.jp

Professor    Kokubo, Eiichiro

Research Field
Formation of planetary systems
Brief Introduction of Research
Theoretical study of formation processes of planetary systems. It is now recognized that in the Milky Way galaxy, there are various planetary systems, including our own solar system. Using basic astrophysics and computer simulations, I investigate elementary processes of planet formation and aim at constructing a general theory for formation of planetary systems.
Contact us
E-mail: kokubo[at]th.nao.ac.jp
http://www.cfca.nao.ac.jp/~kokubo/

Associate Professor    Nakamura, Fumitaka

Research Field
Star formation, star cluster formation, stellar feedback, magnetic fields of ISM
Brief Introduction of Research
I believe that stars are the most basic object in our universe. I'd like to understand how such stars form in the universe. I do both numerical simulations and observations to understand physical processes of star formation. I started observational studies of star formation when I moved to NAOJ. I use ALMA, SMA, Nobeyama 45-m, ASTE, and JCMT telescopes.
Contact us
E-mail: fumitaka.nakamura[at]nao.ac.jp
http://th.nao.ac.jp/MEMBER/nakamrfm/indexe.html

Associate Professor    Ohishi, Masatoshi

Research Field
Radio astronomy especially astrochemistry and astrobiology
Data-intensive astronomy
Brief Introduction of Research
The Universe could be origin of all life. There is a hypothesis that organic molecules formed in space were brought into the primordial Earth, which further evolved towards the “Origin of Life”. Our group has been tackling this attractive story by means of the radio astronomical approach by using radio telescopes e.g., the Nobeyama 45m telescope and the ALMA. The National Institute of Natural Sciences (NINS), the parent organization to the NAOJ, has started a new field, “Life in the Universe” since April 2013, where I am a member. Graduate students would have a great chance to join to this field. Chirality and “Biomarkers” would be other targets of our research. Further I am pushing a new astronomical research by means of “Data”, which would be the fourth paradigm not only in astronomy but in other science fields. Those who wish to open this new field are also welcome.
Contact us
E-mail: masatoshi.ohishi[at]nao.ac.jp
http://jvo.nao.ac.jp/

Assistant Professor    Ohsuga, Ken

Research Field
Formation of Super-massive Black-holes
Black-hole Accretion Flow and Outflow
Relativistic Radiation Magneto-hydrodynamic Simulations
Brief Introduction of Research
Black hole accretion flows, which are more powerful energy sources in the universe, are the central engine of the high-energy astrophysical phenomena, i.e. active galactic nuclei, X-ray binaries, and gamma-ray bursts. The mass accretion onto the black hole would play an important role for the formation mechanism of the supermassive black holes. We investigate the physics of the black-hole accretion flows, jets, and disk winds by performing relativistic radiation magnetohydrodynamic simulations.
Contact us
E-mail: ken.ohsuga[at]nao.ac.jp
http://th.nao.ac.jp/MEMBER/ohsuga/Ken_Ohsugas_Home_Page/Top.html

Associate Professor    Sekii, Takashi

Research Field
Helioseismology, Asteroseismology, Inverse theory
Brief Introduction of Research
My research interest is in investigating internal structure and dynamics of the Sun and stars using waves (helio- and asteroseismology), where inversion is often the central tool.
Contact us
E-mail: sekii[at]solar.mtk.nao.ac.jp
http://solarwww.mtk.nao.ac.jp/helioseismology/

Associate Professor    Sekimoto, Yutaro

Research Field
Astronomy instrumentation, Radio Astronomy, Cosmology, Superconducting detectors,
Brief Introduction of Research
Advances of astronomy instruments have been providing new discoveries. We are developing wide-field millimeter/submillimeter instruments with superconducting detectors for cosmology and submillimeter astronomy. Our ongoing subjects includes cosmic microwave background (CMB) B-mode polarization, large scale survey of distant galaxies, microwave kinetic inductance detector (MKID), and wide field-of-view/broadband cryogenic optics.
Contact us
E-mail: Sekimoto.yutaro[at]nao.ac.jp
http://atc.mtk.nao.ac.jp/~sekimoto/
http://atc.mtk.nao.ac.jp/

Associate Professor    Shan, Wenlei

Research Field
Superconducting electronics and its application in radio astronomy
Brief Introduction of Research
1. Fabrication techniques of superconducting devices
2. Multibeam heterodyne receivers development
3. Superconducting devices physics studies
Contact us
E-mail: wenlei.shan[at]nao.ac.jp

Assistant Professor    Shimojo, Masumi

Research Field
Solar Physics
Brief Introduction of Research
To understand the energy release process caused by the magnetic energy, I investigate the active phenomena in solar atmosphere using multi-wavelength observing data.
Especially, I am interesting in the phenomena that are associated with jets and eruptions.
For my research, I use the X-ray and optical data obtained by Hinode and the microwave data obtained by Nobeyama Heliograph.
The multi-wavelength data analysis is essential for the studies of solar physics.
Recently, I joined to ALMA project, I am working on developing the solar observations by ALMA.
Contact us
E-mail: masumi.shimojo[at]nao.ac.jp

Assistant Professor    Shirasaki, Yuji

Research Field
High energy astrophysics, cosmic-ray physics, database astronomy
Brief Introduction of Research
I am an observational astrophysicist. My current research interest is to understand the evolution of a supermassive black hole. My work uses a lot of data from major archives of the worlds, such as, Subaru, SDSS, UKIDSS, and so on. To utilize such big datasets, I am also interested in the development of a distributed computing system.
Contact us
http://jvo.nao.ac.jp/~yshirasa/index.en.html

Associate Professor    Suematsu, Yoshinori

Research Field
Solar Physics
Solar Instrumentation
Brief Introduction of Research
Observational study of the origin and mechanism of solar dynamical outer atmosphere and development of space and ground-based solar observing instruments
Contact us
E-mail: suematsu[at]solar.mtk.nao.ac.jp
http://solarwww.mtk.nao.ac.jp/suematsu/

Associate Professor    Takata, Tadafumi

Research Field
Optical and infrared astronomy
Galactic astronomy (Formation and evolution of galaxies and AGN)
Astronomical Database
Brief Introduction of Research
My main research is to study the formation and evolution mechanism based on multi-wavelength observational data(mainly based on optical and near infrared), especially focused on dusty galaxies which are doing vigorous start formation at high redshift universe. I'm also very interested in producing very large astronomical database and investigating statistically the features of galaxies in the universe, and currently working around development of database for the next generation wide field camera of Subaru telescope.
Contact us

Assistant Professor    Tanaka, Masaomi

Research Field
Supernovae, Radiative Transfer, Optical Astronomy
Brief Introduction of Research
I ’m working on theoretical and observational astronomy. My research interests include supernova explosion, stellar evolution, and transient objects in the Universe. To understand the mechanism of supernova explosion, I’ve been working on radiative transfer simulation in supernovae. Based on the prediction obtained from my own simulations, I’ve been working on optical observations of supernovae, using Subaru telescope. Especially, I ’m interested in spectro-polarimetry, which is the powerful tool to study the multi-dimensional geometry of supernova explosions. I ’m also working on wide field transient survey (to discover new transient objects) and infrared observation (to understand dust production by supernovae).
Contact us
E-mail: masaomi.tanaka[at]nao.ac.jp
http://th.nao.ac.jp/~tanaka/

Assistant Professor    Tatsumi, Daisuke

Research Field
Gravitational-wave astronomy
Precise measurements using laser interferometer
Brief Introduction of Research
The first detection of gravitational wave signals is one of the most important science topics.
The wave was predicted by Einstein in his theory of general relativity about 100 years ago.
Because the signal is very faint, it is difficult to detect by past or current detectors.
To archive this goal, now we focus on construction of KAGRA detector in Kamioka mine.
It has large scale of 3 km long. Several latest technologies are introduced to the detector.
We are in charge of ultra-high quality mirror developments and of making multi-messenger astronomical observatory network for future gravitational-wave astronomy.
Contact us
http://tamago.mtk.nao.ac.jp/

Professor    Tomisaka, Kohji

Research Field
Simulation Astronomy, Physical Processes in Interstellar Matter, and Star Formation
Brief Introduction of Research
I am studying physical processes in interstellar matter, especially star formation process using magnetohydrodynamics (MHD) and/or hydrodynamics (HD) simulations. Topics I am interested in are: non-linear structure-formation process seen in such as the evolution of interstellar matter and gravitational contraction from molecular clouds to stars. I am also interested in the development of high-resolution MHD/HD simulation schemes. Recently, I am extending my research to the observational visualization, in which the observational expectations of computer-made result of MHD/HD simulations are calculated and mock observations are made for the optical and radio telescopes of NAOJ, such as Subaru and ALMA.
Contact us
E-mail: tomisaka[at]th.nao.ac.jp
http://th.nao.ac.jp/MEMBER/tomisaka/Tomisaka_E.html

Professor    Watanabe, Tetsuya

Research Field
Solar Physics, Plasma Spectroscopy, UV Astronomy
Brief Introduction of Research
    My major field in astrophysics is solar and stellar physics with spectroscopic observations in UV and X-ray wavelengths. Participating in the space missions of Tansei IV, Hinotori, Yohkoh, and Hinode, I have been interested in the mechanism of solar coronal heating and the production of high-temperature plasmas in the cores of active regions. Spectroscopy in UV and X-ray wavelengths with the EUV Imaging Spectrometer (EIS) on board the Hinode mission provides powerful tools to diagnose these high-temperature plasmas, and I am currently working with its excellent quality data, and trying to reveal very dynamic and fine structures of the corona and the transition region in temperature, density, and velocity.
    The next Japanese sun observing mission is called the Solar-C program, and I am now chairing the working group for studying the feasibility of the mission both from scientific and technological aspects.
Contact us
http://solarwww.mtk.nao.ac.jp/watanabe/
http://guas-astronomy.jp/Supervisors/solar.html
http://hinode.nao.ac.jp/index_e.shtml

Associate Professor    Yamaoka, Hitoshi

Research Field
supernova (theoretical and observational) Data mining observation of space debris
Brief Introduction of Research
Researches on supernovae, both theoretically and observationally. Information circulation about transient objects. Data mining from archived astronomical observation. Survey and population estimates of space debris. Communication with astronomy.
Contact us
E-mail: hitoshi.yamaoka[at]nao.ac.jp
http://prc.nao.ac.jp/prc/#pro

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