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Nov 16, 2012

In the previous section, we have obtained the Galaxy center distance to be R0=8.05±0.45kpc, with the error bar including systematics due to possible “outliers”. This result is fully consistent with recent studies of R0. For instance, the review pape…

Fundamental Parameters of the Milky Way Galaxy Based on VLBI astromet…

We present analyses to determine the fundamental parameters of the Galaxy based on VLBI astrometry of 52 Galactic maser sources obtained with VERA, V…
Dec 28, 2010

As shown in section 1, the source at the tangent point has a kinematically unique property and one of the key objects to study the kinematics and geometry of the MWG. Due to a symmetric geometry, the radial velocity of a source at the tangent point …

Astrometry of Galactic Star-Forming Region Onsala 1 with VERA: Esti…

We conducted the astrometry of H2O masers in the Galactic star-forming region Onsala 1 (ON1) with VLBI Exploration of Radio Astrometry (VERA). We mea…
Mar 19, 2014

ALMA view of G0.253+0.016: Can cloud-cloud collision form the cloud?

We present the results of sulfur monoxide, SO line emission observations of G0.253+0.016 with the Atacama Large Millimeter/submillimeter Array (ALMA)…
Aug 27, 2017

ALMA Multiple-Transition Molecular Line Observations of the Ultralu…

We present our ALMA multi-transition molecular line observational results for the ultraluminous infrared galaxy, IRAS 20551-4250, which is known to c…
Aug 01, 2007

In order to quantitatively estimate the spectra of energetic electrons generated in solar flares based on the observed gamma-ray spectra, we numerically studied the electron transport and gamma-ray emission in the solar atmosphere. As elementary pro…

Effects of Compton scattering on the Gamma Ray Spectra of Solar flares

Using fully relativistic GEANT4 simulation tool kit, the transport of energetic electrons generated in solar flares was Monte-Carlo simulated, and re…
Feb 09, 2009

Evolution of Cosmological Perturbations in the Presence of Primordial…

Possible existence of the primordial magnetic fields has affected the structure formation of the universe. In this paper it is shown that the initial…
Jan 10, 2019
Instrumentation and Detectors

Vibration isolation system with a compact damping system for power …

A vibration isolation system called Type-Bp system used for power recycling mirrors has been developed for KAGRA, the interferometric gravitational-w…
Jun 20, 2014
By rhythm

An early phase of environmental effects on galaxy properties unveiled…

This work presents the results from our near-infrared spectroscopy of narrow-band selected H$\alpha$ emitters (HAEs) in two rich over-densities (PKS …
Oct 09, 2012

GENJI Programme: Gamma-ray Emitting Notable AGN Monitoring by Japanes…

We introduce the GENJI program (Gamma-ray Emitting Notable AGN Monitoring by Japanese VLBI), which is a monitoring program of gamma-ray bright AGNs w…
Jul 28, 2009
By mskim

Reddening and Distance of the Local Group Starburst Galaxy IC 10

We estimate the reddening and distance of the nearest starburst galaxy IC 10 using deep near infrared $JHK_{S}$ photometry obtained with the Multi-Ob…
May 02, 2014
By p.scott

The elemental composition of the Sun I. The intermediate mass element…

The composition of the Sun is an essential piece of reference data for astronomy, cosmology, astroparticle, space and geo-physics. This article, deal…
Aug 30, 2018

ALMA Observations toward the starburst dwarf galaxy NGC 5253: I. Mo…

We present high-spatial-resolution ($\sim 0\farcs2$, or $\sim$3\,pc) CO(2--1) observations of the nearest young starburst dwarf galaxy, NGC\,5253, ta…
Sep 13, 2018

Molecular gas and Star Formation Properties in Early Stage Mergers: S…

Mergers of galaxies are an important mode for galaxy evolution because they serve as an efficient trigger of powerful starbursts. However, observatio…
Nov 30, 2011

Parallaxes and proper motions of interstellar masers toward the Cygnu…

Whether the Cygnus X complex consists of one physically connected region of star formation or of multiple independent regions projected close togethe…
Jun 28, 2018

Recent progress in high-mass star-formation studies with ALMA

Formation processes of high-mass stars have been long-standing issues in astronomy and astrophysics. This is mainly because of major difficulties in …
Jun 12, 2013
Plasma Physics
Space Physics

Kinetic aspects of the ion current layer in a reconnection outflow …

Kinetic aspects of the ion current layer at the center of a reconnection outflow exhaust near the X-type region are investigated by a two-dimensional…
Oct 20, 2011

Near-IR Polarimetry Around 30 Doradus: I. Separation of the Galactic …

A 20 arcmin \times 20 arcmin region around 30 Doradus in the Large Magellanic Cloud (LMC) is observed and analyzed in the near-infrared. We obtain po…
Jul 25, 2018

Impact of radio sources and cosmic infrared background on thermal S…

Cross correlation with thermal Sunyaev-Zel'dovich (tSZ) effect in cosmic microwave background observation and weak gravitational lensing effect in ga…
Aug 07, 2008

Effects of Beta-Decays of Excited-State Nuclei on the Astrophysical …

A rudimentary calculation is employed to evaluate the possible effects of beta- decays of excited-state nuclei on the astrophysical r-process. Single…
Feb 16, 2013

Unveiling the detailed density and velocity structures of the proto…

We present an observational study of the protostellar core B335 harboring a low-mass Class 0 source. The observations of the H13CO+(J=1-0) line emiss…
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