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Research Gallery

The Greenland Telescope (GLT) and Submillimeter VLBI

Parabolic Streamline of the Black Hole-driven Jet from ten to million gravitational radii in M87 Parabolic Streamline of the Black Hole-driven Jet from ten to million gravitational radii in M87
Multi-wavelength VLBI observations (Asada & Nakamura 2012; Nakamura & Asada 2013; Asada, Nakamura, & Pu 2016) reveal the collimating jet profile inside the sphere of gravitational influence of the supermassive ...(more)
Formation of Superluminal Knots in GRMHD simulations Formation of Superluminal Knots in GRMHD simulations
Superluminal motions are widely detected in AGN jets by utilizing the VLBI technique, implying that the flow is highly relativistic (apparent speeds are exceeding the speed of light ~ 10 ...(more)
Extreme jet ejections from the black hole X-ray binary V404 Cygni Extreme jet ejections from the black hole X-ray binary V404 Cygni
High time resolution light curves tracing the rapidly evolving jets in the black hole X-ray binary V404 Cygni. ...(more)
Velocity Field of M87 jet Velocity Field of M87 jet
The velocity field of the M87 jet from milli-arcsecond (mas) to arcsecond scales using VLBI observations, and it exhibits a systematic increase from sub-to-superluminal speed in the range from 100 ...(more)
VSOP image of M87 at 5 GHz VSOP image of M87 at 5 GHz
Image of M87 jet taken with Space VLBI (VSOP). Innermost jet are resolved into transverse direction, and three ridgelines, presumably correspond to spine and sheath structure, are clearly seen for ...(more)
System integration test from receiver to Mark 6 recorder System integration test from receiver to Mark 6 recorder
In May 2017, the GLT make the very first-time integration test from receiver to the backend recorder in ASIAA-Hawaii laboratory. Since the instrument rack is not delivered on time, the ...(more)
GLT receiver noise measurement in JCMT GLT receiver noise measurement in JCMT
The GLT frontend hardware was installed in JCMT of EAO for function test with sky signal. An LN2 container has set up in its Rx-cabin for Trx measurement before the ...(more)
Deploy GLT cryostat into Rx-cabin Deploy GLT cryostat into Rx-cabin
The Cryostat is fixed on a hydraulic lifting dolly as a "package", and this package is lifted by a cherry picker in order to put on the Rx-cabin platform. ...(more)
GLT Frontend System GLT Frontend System
The cryostat chamber mounted on an alumina holding structure (The dewar frame) shown in the center of the picture. Except for few instruments fixed on the dewar frame, most frontend ...(more)
Deep inside Perseus A — A Space VLBI telescope makes a sharp image of the forming black hole jets in the core of a radio galaxy Deep inside Perseus A — A Space VLBI telescope makes a sharp image of the forming black hole jets in the core of a radio galaxy
An international team of researchers has imaged newly forming jets of plasma from a massive black hole in NGC 1275 (3C 84) with unprecedented accuracy. Radio images made with a ...(more)
Resolving the Geometry of Innermost Relativistic Jets in Blazars Resolving the Geometry of Innermost Relativistic Jets in Blazars
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 jets have ...(more)
Image simulation of black hole shadow and jet Image simulation of black hole shadow and jet
The black hole shadow image (the bright circle) resulting from a relativistic jet (the luminous u-shape region) launched near the event horizon. ...(more)
Image simulation of black hole shadow Image simulation of black hole shadow
Image simulation of black hole shadow ("silhouette") images based on a possible accretion flow model. ...(more)
Semi-analytical GRMHD jet model Semi-analytical GRMHD jet model
A semi-analytical solution of GRMHD flow along a prescribed flow line can be obtained by considering that the outward energy flux (represented by a gray arrow) is continuously propagate outward ...(more)
Visualizing ray around a Kerr black hole Visualizing ray around a Kerr black hole
"Odyssey_Edu" is an educational software is developed for visualizing the ray around a Kerr black hole (available at https://odysseyedu.wordpress.com/). ...(more)
ASIAA Cluster for VLBI DiFX correlator. ASIAA Cluster for VLBI DiFX correlator.
ASIAA Cluster for VLBI DiFX correlator. ...(more)
The ALMA-NA prototype telescope at Socorro, New Mexico, with one of the JVLA antennas. The ALMA-NA prototype telescope at Socorro, New Mexico, with one of the JVLA antennas.
The ALMA-NA prototype telescope at Socorro, New Mexico, with one of the JVLA antennas. ...(more)
ASIAA radiometer in Eureka, Canada ASIAA radiometer in Eureka, Canada
One of our new initiatives is to find a new site for submillimeter telescope. Such effort needs a long-term monitoring of the sky transparency in radio wavelength. In February 2011, ...(more)
Disassemble one of the ALMA prototype antennas for retrofitting and ready for the use of VLBI in submillimeter wavelength Disassemble one of the ALMA prototype antennas for retrofitting and ready for the use of VLBI in submillimeter wavelength
Disassemble one of the ALMA prototype antennas for retrofitting and ready for the use of VLBI in submillimeter wavelength. This picture shows the disassembly process in November 2012, at the ...(more)
Retrofitting one of the ALMA prototype antennas for the use of VLBI in submillimeter wavelength Retrofitting one of the ALMA prototype antennas for the use of VLBI in submillimeter wavelength
Retrofitting one of the ALMA prototype antennas for the use of VLBI in submillimeter wavelength. This picture shows the preliminary inspection of the antenna in July 2011, at the site ...(more)
ASIAA Radiometer in Greenland ASIAA Radiometer in Greenland
The 225 GHz ASIAA radiometer has been surveying the atmospheric clarity on the Greenland ice sheet since the summer of 2011. It has provided us the precious data regarding the ...(more)
Greenlan Telescope Project -- Disassembly in Socorro, NM Greenlan Telescope Project -- Disassembly in Socorro, NM
Disassembly of the ALMA NA Prototype in Nov. 2012. The antenna will be retrofitted for the extreme cold environment operations on the Greenland ice sheet. ...(more)
The Structure of the M87 Jet: A Transition from Parabolic to Conical Streamlines The Structure of the M87 Jet: A Transition from Parabolic to Conical Streamlines
Distribution of the radius of the M87 jet as a function of the deprojected distance from the core in units of r_s (Schwarzschild radius). ...(more)
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