176 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- National Astronomical Observatory of JapanJP17 papers
- Kagoshima UniversityJP16 papers
- Korea Astronomy and Space Science InstituteKR10 papers
- The Graduate University for Advanced Studies, SOKENDAIJP9 papers
- Kyung Hee UniversityKR4 papers
- Shanghai Astronomical ObservatoryCN4 papers
- Yamaguchi UniversityJP4 papers
- Hokkaido UniversityJP3 papers
- Max Planck Institute for Radio AstronomyDE3 papers
- The University of TokyoJP3 papers
- Chinese Academy of SciencesCN2 papers
- International Centre for Radio Astronomy ResearchAU2 papers
20 papers
EAVN Astrometry toward the Extreme Outer Galaxy: Kinematic distance with the proper motion of G034.84-00.95
Nobuyuki Sakai, Bo Zhang, Shuangjing Xu +22
We aim to reveal the structure and kinematics of the Outer-Scutum-Centaurus (OSC) arm located on the far side of the Milky Way through very long baseline interferometry (VLBI) astr…
Annual parallax measurement of a Mira variable star BX Cam with VERA
Masako Matsuno, Akiharu Nakagawa, Atsushi Morita +8
We report results of astrometric VLBI observations toward a Mira variable star BX~Cam using the VLBI array "VERA". The observations were performed from February 2012 to November 20…
The First VERA Astrometry Catalog
VERA collaboration, Tomoya Hirota, Takumi Nagayama +59
We present the first astrometry catalog from the Japanese VLBI (very long baseline interferometer) project VERA (VLBI Exploration of Radio Astrometry). We have compiled all the ast…
Vertical Structure and Kinematics of the Galactic Outer Disk
Nobuyuki Sakai, Takumi Nagayama, Hiroyuki Nakanishi +7
We report measurements of parallax and proper motion for four 22 GHz water maser sources as part of VERA Outer Rotation Curve project. All sources show Galactic latitudes of 2$…
Outer rotation curve of the Galaxy with VERA IV: Astrometry of IRAS 01123+6430 and the possibility of cloud-cloud collision
Nagito Koide, Hiroyuki Nakanishi, Nobuyuki Sakai +13
As part our investigation into the Galactic rotation curve, we carried out Very Long Baseline Interferometry (VLBI) observations towards the star-forming region IRAS 01123+6430 usi…
Neural Feature Embedding for User Response Prediction in Real-Time Bidding (RTB)
Enno Shioji, Masayuki Arai
In the area of ad-targeting, predicting user responses is essential for many applications such as Real-Time Bidding (RTB). Many of the features available in this domain are sparse…
Parallax of a Mira variable R Ursae Majoris studied with astrometric VLBI
Akiharu Nakagawa, Tomoharu Kurayama, Makoto Matsui +5
We have measured an annual parallax of the Mira variable R~Ursae~Majoris (R~UMa) with the VLBI exploration for Radio Astronomy (VERA). From the monitoring VLBI observations spannin…
Outer Rotation Curve of the Galaxy with VERA III: Astrometry of IRAS 07427-2400 and Test of the Density-Wave Theory
Nobuyuki Sakai, Hiroyuki Nakanishi, Mitsuhiro Matsuo +6
We report the trigonometric parallax of IRAS 07427-2400 with VERA to be 0.185 0.027 mas, corresponding to a distance of 5.41 kpc. The result is consistent w…
Outer Rotation Curve of the Galaxy with VERA II: Annual Parallax and Proper Motion of the Star-Forming Region IRAS21379+5106
Hiroyuki Nakanishi, Nobuyuki Sakai, Tomoharu Kurayama +7
We conducted astrometric VLBI observations of water-vapor maser emission in the massive star forming region IRAS 21379+5106 to measure the annual parallax and proper motion, using…
VLBI observations of bright AGN jets with KVN and VERA Array (KaVA): Evaluation of Imaging Capability
Kotaro Niinuma, Sang-Sung Lee, Motoki Kino +69
The Korean very-long-baseline interferometry (VLBI) network (KVN) and VLBI Exploration of Radio Astrometry (VERA) Array (KaVA) is the first international VLBI array dedicated to hi…
Trigonometric Parallax of IRAS 22555+6213 with VERA: 3-Dimensional View of Sources Along the Same Line of Sight
James O. Chibueze, Hirofumi Sakanoue, Takumi Nagayama +11
We report the results of the measurement of the trigonometric parallax of an HO maser source in \r22 with the VLBI Exploration of Radio Astrometry (VERA). The annual parallax w…
The First Very Long Baseline Interferometry Image of 44 GHz Methanol Maser with the KVN and VERA Array (KaVA)
Naoko Matsumoto, Tomoya Hirota, Koichiro Sugiyama +58
We have carried out the first very long baseline interferometry (VLBI) imaging of 44 GHz class I methanol maser (7_{0}-6_{1}A^{+}) associated with a millimeter core MM2 in a massiv…
Properties of Intrinsic Polarization Angle Ambiguities in Faraday Tomography
Kohei Kumazaki, Takuya Akahori, Shinsuke Ideguchi +2
Faraday tomography is a powerful method to diagnose polarizations and Faraday rotations along the line of sight. The quality of Faraday tomography is, however, limited by several c…
VLBI Observation of Microquasar Cyg X-3 during an X-ray State Transition from Soft to Hard in the 2007 May-June Flare
Jeong-Sook Kim, Soon-Wook Kim, Tomoharu Kurayama +3
We present a radio observation of microquasar Cyg X-3 during an X-ray state transition from ultrasoft to hard state in the 2007 MayJune flare using the VLBI Exploration of Radio…
Evolution of the Water Maser Expanding Shell in W75N VLA 2
Jeong-Sook Kim, Soon-Wook Kim, Tomoharu Kurayama +6
We present Very Long Baseline Interferometry (VLBI) observations of 22 GHz HO masers in the high-mass star-forming region of \objectname{W75N}, carried out with VLBI Exploratio…
The outer rotation curve project with VERA: Trigonometric parallax of IRAS 05168+3634
Nobuyuki Sakai, Mareki Honma, Hiroyuki Nakanishi +3
We present a measurement of the trigonometric parallax of IRAS 05168+3634 with VERA. The parallax is 0.532 +/- 0.053 mas, corresponding to a distance of 1.88 +0.21/-0.17 kpc. This…
Fundamental Parameters of the Milky Way Galaxy Based on VLBI astrometry
Mareki Honma, Takumi Nagayama, Kazuma Ando +31
We present analyses to determine the fundamental parameters of the Galaxy based on VLBI astrometry of 52 Galactic maser sources obtained with VERA, VLBA and EVN. We model the Galax…
Pilot VLBI Survey of SiO v=3 J=1--0 Maser Emission around Evolved Stars
Hiroshi Imai, Miyako Oyadomari, Sze Ning Chong +9
In this Letter, we report detections of SiO v=3 J=1--0 maser emission in very long baseline interferometric (VLBI) observations towards 4 out of 12 long-period variable stars: WX P…
Annual Parallax Distance and Secular Motion of the Water Fountain Source IRAS 18286-0959
Hiroshi Imai, Tomoharu Kurayama, Mareki Honma +1
We report on results of astrometric observations of water vapor masers in the "water fountain" source IRAS 18286-0959 (I18286) with the VLBI Exploration of Radio Astrometry (VERA).…
Collective Dynamics of Josephson Vortices in Intrinsic Josephson Junctions :Exploration of In-phase Locked Superradiant Vortex Flow States
M. Machida, T. Koyama, A. Tanaka +1
In order to clarify the ``superradiant'' conditions for the moving Josephson vortices to excite in-phase AC electromagnetic fields over all junctions, we perform large scale simula…