1.9k citations · 16.3k across the 95 of their papers we have counts for
26 papers · 1 filter
First frequency phase transfer from the 3 mm to the 1 mm band on an Earth-sized baseline
Sara Issaoun, Dominic W. Pesce, María J. Rioja +33
Frequency Phase Transfer (FPT) is a technique designed to increase coherence and sensitivity in radio interferometry by making use of the non-dispersive nature of the troposphere t…
Enhanced imaging of M87*: Simulations with the EHT and extended-KVN
Ilje Cho, Jongho Park, Do-Young Byun +16
The Event Horizon Telescope (EHT) has successfully revealed the shadow of the supermassive black hole, M87*, with an unprecedented angular resolution of approximately 20 uas at 230…
Optical frequency comb integration in radio telescopes: advancing signal generation and phase calibration
Minji Hyun, Changmin Ahn, Junyong Choi +8
Very long baseline interferometry (VLBI) enables high-angular-resolution observations in astronomy and geodesy by synthesizing a virtual telescope with baselines spanning hundreds…
First Very Long Baseline Interferometry Detections at 870μm
Alexander W. Raymond, Sheperd S. Doeleman, Keiichi Asada +276
The first very long baseline interferometry (VLBI) detections at 870m wavelength (345GHz frequency) are reported, achieving the highest diffraction-limited angular resolutio…
A Geodetic and Astrometric VLBI Experiment at 22/43/88/132 GHz
Shuangjing Xu, Taehyun Jung, Bo Zhang +14
Extending geodetic and astrometric Very Long Baseline Interferometry (VLBI) observations from traditional centimeter wavebands to millimeter wavebands offers numerous scientific po…
Radio Astronomy with Multiband Receivers and Frequency Phase Transfer: Scientific Perspectives
Richard Dodson, Cristina García-Miró, Marcello Giroletti +9
The technique of frequency phase transfer (FPT), enabled by multiband receivers with shared optical path (SOP), is set to become a true backbone of VLBI operations at frequencies a…
The Capella Program: Toward A Space-only High-frequency Radio VLBI Network Formed by Small Satellites in Low Earth Orbits
Sascha Trippe, Taehyun Jung, Jung-Won Lee +11
Very long baseline radio interferometry (VLBI) with ground-based observatories is limited by the size of Earth, the geographic distribution of antennas, and the transparency of the…
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…
SYMBA: An end-to-end VLBI synthetic data generation pipeline
F. Roelofs, M. Janssen, I. Natarajan +203
Realistic synthetic observations of theoretical source models are essential for our understanding of real observational data. In using synthetic data, one can verify the extent to…
First M87 Event Horizon Telescope Results. II. Array and Instrumentation
The Event Horizon Telescope Collaboration
The Event Horizon Telescope (EHT) is a very long baseline interferometry (VLBI) array that comprises millimeter- and submillimeter-wavelength telescopes separated by distances comp…
Source-Frequency Phase-Referencing Observation of AGNs with KaVA Using Simultaneous Dual-Frequency Receiving
Guang-Yao Zhao, Taehyun Jung, Bong Won Sohn +27
The KVN(Korean VLBI Network)-style simultaneous multi-frequency receiving mode is demonstrated to be promising for mm-VLBI observations. Recently, other Very long baseline interfer…
The Power of Simultaneous Multi-frequency Observations for mm-VLBI: Beyond Frequency Phase Transfer
Guang-Yao Zhao, Juan Carlos Algaba, Sang-Sung Lee +15
Atmospheric propagation effects at millimeter wavelengths can significantly alter the phases of radio signals and reduce the coherence time, putting tight constraints on high frequ…
A comparative study of amplitude calibrations for East-Asia VLBI Network: a-priori and template spectrum methods
Ilje Cho, Taehyun Jung, Guang-Yao Zhao +11
We present the results of comparative study of amplitude calibrations for East-Asia VLBI Network (EAVN) at 22 and 43 GHz using two different methods of an "a-priori" and a "templat…
The Science Case for Simultaneous mm-Wavelength Receivers in Radio Astronomy
Richard Dodson, María J. Rioja, Taehyun Jung +6
This review arose from the European Radio Astronomy Technical Forum (ERATec) meeting held in Firenze, October 2015, and aims to highlight the breadth and depth of the high-impact s…
The automatic calibration of Korean VLBI Network data
Jeffrey A. Hodgson, Sang-Sung Lee, Guang-Yao Zhao +4
The calibration of Very Long Baseline Interferometry (VLBI) data has long been a time consuming process. The Korean VLBI Network (KVN) is a simple array consisting of three identic…
The East-Asian VLBI Network
Kiyoaki Wajima, Yoshiaki Hagiwara, Tao An +14
The East-Asian VLBI Network (EAVN) is the international VLBI facility in East Asia and is conducted in collaboration with China, Japan, and Korea. The EAVN consists of VLBI arrays…
The Power of Simultaneous Multi-Frequency Observations for mm-VLBI: Astrometry up to 130 GHz with the KVN
Maria J. Rioja, Richard Dodson, Taehyun Jung +1
Simultaneous observations at multiple frequency bands have the potential to overcome the fundamental limitation imposed by the atmospheric propagation in mm-VLBI observations. The…
Amplitude Correction Factors of KVN Observations
Sang-Sung Lee, Do-Young Byun, Chung Sik Oh +7
We report results of investigation of amplitude calibration for very long baseline interferometry (VLBI) observations with Korean VLBI Network (KVN). Amplitude correction factors a…
A New Hardware Correlator in Korea: Performance Evaluation using KVN observations
Sang-Sung Lee, Chung Sik Oh, Duk-Gyoo Roh +10
We report results of the performance evaluation of a new hardware correlator in Korea, the Daejeon correlator, developed by the Korea Astronomy and Space Science Institute (KASI) a…
Very Long Baseline Interferometry with the SKA
Zsolt Paragi, Leith Godfrey, Cormac Reynolds +79
Adding VLBI capability to the SKA arrays will greatly broaden the science of the SKA, and is feasible within the current specifications. SKA-VLBI can be initially implemented by pr…
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…
The KaVA and KVN Pulsar Project
Richard Dodson, Chunglee Kim, Bongwon Sohn +4
We present our work towards using the Korean VLBI (Very Long Baseline Interferometer) Network (KVN) and VLBI Exploration of Radio Astronomy (VERA) arrays combined into the KVN and…
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…