63 citations · 524 across the 24 of their papers we have counts for
24 papers
Long-term Simultaneous Monitoring Observations of SiO and H2O Masers toward the Mira Variable WX Serpentis
Jang-Ho Lim, Jaeheon Kim, Se-Hyung Cho +4
We present the results from long-term simultaneous monitoring observations of SiO and H2O masers toward the Mira variable star WX Serpentis. This study has been conducted with 21m…
Overview of the Observing System and Initial Scientific Accomplishments of the East Asian VLBI Network (EAVN)
Kazunori Akiyama, Juan-Carlos Algaba, Tao An +101
The East Asian VLBI Network (EAVN) is an international VLBI facility in East Asia and is operated under mutual collaboration between East Asian countries, as well as part of Southe…
Sciences with Thai National Radio Telescope
Phrudth Jaroenjittichai, Koichiro Sugiyama, Busaba H. Kramer +44
This White Paper summarises potential key science topics to be achieved with Thai National Radio Telescope (TNRT). The commissioning phase has started in mid 2022. The key science…
The Astrometric Animation of Water Masers towards the Mira Variable BX Cam
Shuangjing Xu, Hiroshi Imai, Youngjoo Yun +20
We report VLBI monitoring observations of the 22 GHz water (HO) masers around the Mira variable BX Cam, which were carried out as a part of the EAVN Synthesis of Stellar Mase…
AGB interlopers in YSO catalogues hunted out by NEOWISE
Jeong-Eun Lee, Sieun Lee, Seonjae Lee +7
AGBs and YSOs often share the same domains in IR color-magnitude or color-color diagrams leading to potential mis-classification. We extracted a list of AGB interlopers from the pu…
Asymmetric distributions of H2O and SiO masers towards V627 Cas
Haneul Yang, Se-Hyung Cho, Youngjoo Yun +7
We performed simultaneous observations of the H2O 6(1,6) - 5(2,3) (22.235080 GHz) and SiO v= 1, 2, J = 1 - 0, SiO v = 1, J = 2 - 1, 3 - 2 (43.122080, 42.820587, 86.243442, and 129.…
Jet Kinematics of the Quasar 4C +21.35 from Observations with the KaVA Very Long Baseline Interferometry Array
Taeseok Lee, Sascha Trippe, Motoki Kino +39
We present the jet kinematics of the flat spectrum radio quasar (FSRQ) 4C +21.35 using time-resolved KaVA very long baseline interferometry array radio maps obtained from September…
Simultaneous VLBI Astrometry of H2O and SiO Masers toward the Semiregular Variable R Crateris
Dong-Jin Kim, Se-Hyung Cho, Youngjoo Yun +7
We obtained, for the first time, astrometrically registered maps of the 22.2 GHz H2O and 42.8, 43.1, and 86.2 GHz SiO maser emission toward the semiregular b-type variable (SRb) R…
Astrometrically registered maps of H2O and SiO masers toward VX Sagittarii
Dong-Hwan Yoon, Se-Hyung Cho, Youngjoo Yun +8
The supergiant VX Sagittarii is a strong emitter of both H2O and SiO masers. However, previous VLBI observations have been performed separately, which makes it difficult to spatial…
Registration of HO and SiO masers in the Calabash Nebula, to confirm the Planetary Nebula paradigm
Richard Dodson, Maria Rioja, Valentin Bujarrabal +4
We report on the astrometric registration of VLBI images of the SiO and water masers in OH231.8+4.2, the iconic Proto-Planetary Nebula also known as the Calabash nebula, using the…
Pilot KaVA monitoring on the M87 jet: confirming the inner jet structure and superluminal motions at sub-pc scales
Kazuhiro Hada, Jong Ho Park, Motoki Kino +34
We report the initial results of our high-cadence monitoring program on the radio jet in the active galaxy M87, obtained by the KVN and VERA Array (KaVA) at 22 GHz. This is a pilot…
Discovery of an extremely wide-angle bipolar outflow in AFGL 5142
Tie Liu, Qizhou Zhang, Kee-Tae Kim +12
Most bipolar outflows are associated with individual young stellar objects and have small opening angles. Here we report the discovery of an extremely wide-angle (180$\arcdeg…
KVN Monitoring Obsevations toward the Recent Outburst Symbiotic Star V407 Cygni
Se-Hyung Cho, Jaeheon Kim, Youngjoo Yun
Simultaneous time monitoring observations of HO and SiO maser lines were performed toward the D-type symbiotic binary system V407 Cyg with the Korean VLBI Network single dish…
Extremely Energetic Outflow and Decelerated Expansion in W49N
Tie Liu, Kee-Tae Kim, Yuefang Wu +10
W49N is a mini-starburst in the Milky Way and thus an ideal laboratory for high-mass star formation studies. Due to its large distance (11.1 kpc), the kinematics in…
First detection of 22 GHz H2O masers in TX Camelopardalis
Se-Hyung Cho, Jaeheon Kim, Youngjoo Yun
Simultaneous time monitoring observations of HO , SiO = 1--0, 2--1, 3--2, and SiO = 0, = 1--0 lines were carried out in the direction of the…
Astrometrically Registered Simultaneous Observations of the 22 GHz HO and the 43GHz SiO masers towards R Leonis Minoris using KVN and Source/Frequency Phase Referencing
Richard Dodson, María J. Rioja, Tae-Hyun Jung +22
Oxygen-rich Asymptotic Giant Branch (AGB) stars can be intense emitters of SiO (=1 and 2, J=10) and HO maser lines at 43 and 22 GHz, respectively. VLBI observat…
Verification of the Astrometric Performance of the Korean VLBI Network, using comparative SFPR studies with the VLBA at 14/7 mm
María J. Rioja, Richard Dodson, TaeHyun Jung +23
The Korean VLBI Network (KVN) is a new mm-VLBI dedicated array with capability for simultaneous observations at multiple frequencies, up to 129 GHz. The innovative multi-channel re…
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…
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…
Accurate Parallax Measurement toward the Symbiotic Star R Aquarii
Cheulhong Min, Naoko Matsumoto, Mi Kyoung Kim +5
Multi-epoch phase-referencing VLBI (Very Long Baseline Interferometry) observations with VERA (VLBI Exploration of Radio Astrometry) were performed for the symbiotic star R Aquarii…
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…
Single dish performance of KVN 21-m radio telescopes:Simultaneous observations at 22 and 43 GHz
Sang-Sung Lee, Do-Young Byun, Chung Sik Oh +30
We report simultaneous multi-frequency observing performance at 22 and 43 GHz of the 21-m shaped-Cassegrain radio telescopes of the Korean VLBI Network (KVN). KVN is the first mill…
Korean Nova Records in A.D. 1073 and A.D. 1074: R Aquarii
Hong-Jin Yang, Myeong-Gu Park, Se-Hyung Cho +1
R Aqr is known to be a symbiotic binary system with an associated extended emission nebula, possibly produced by a historic outburst. To find the associated historic records, we se…
A Spectral Line Survey from 138.3 to 150.7 GHZ toward Orion-KL
Chang Won Lee, Se-Hyung Cho, Sung-Min Lee
We present the results of a spectral line survey from 138.3 to 150.7 GHz toward Orion-KL. The observations were made using the 14 m radio telescope of Taeduk Radio Astronomy Observ…