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The Greenland Telescope: Antenna Retrofit Status and Future Plans
Philippe Raffin, Paul T. P. Ho, Keiichi Asada +32
Since the ALMA North America Prototype Antenna was awarded to the Smithsonian Astrophysical Observatory (SAO), SAO and the Academia Sinica Institute of Astronomy & Astrophysics (AS…
Resolving the Geometry of the Innermost Relativistic Jets in Active Galactic Nuclei
Juan-Carlos Algaba, Masanori Nakamura, Keiichi Asada +1
In the current paradigm, it is believed that the compact VLBI radio core of radio-loud AGNs represents the innermost upstream regions of relativistic outflows. These regions of AGN…
3.5-Year Monitoring of 225 GHz Opacity at the Summit of Greenland
Satoki Matsushita, Keiichi Asada, Pierre L. Martin-Cocher +6
We present the 3.5-yr monitoring results of 225 GHz opacity at the summit of the Greenland ice sheet (Greenland Summit Camp) at an altitude of 3200 m using a tipping radiometer. We…
Structural Transition in the NGC 6251 Jet: An Interplay with the Supermassive Black Hole and Its Host Galaxy
Chih-Yin Tseng, Keiichi Asada, Masanori Nakamura +3
The structure of the NGC 6251 jet on the milliarcsecond scale is investigated using images taken with the European VLBI Network and the Very Long Baseline Array. We detect a struct…
The Effects of Accretion Flow Dynamics on the Black Hole Shadow of Sagittarius A
Hung-Yi Pu, Kazunori Akiyama, Keiichi Asada
A radiatively inefficient accretion flow (RIAF), which is commonly characterized by its sub-Keplerian nature, is a favored accretion model for the supermassive black hole at Galact…
ALMA Science Verification Data: Millimeter Continuum Polarimetry of the Bright Radio Quasar 3C 286
H. Nagai, K. Nakanishi, R. Paladino +6
We present full-polarization observations of the compact, steep-spectrum radio quasar 3C~286 made with the ALMA at 1.3~mm. These are the first full-polarization ALMA observations,…