The Chinese space millimeter-wavelength VLBI array - a step toward imaging the most compact astronomical objects

Abstract

The Shanghai Astronomical Observatory (SHAO) of the Chinese Academy of Sciences (CAS) is studying a space VLBI (Very Long Baseline Interferometer) program. The ultimate objective of the program is to image the immediate vicinity of the supermassive black holes (SMBHs) in the hearts of galaxies with a space-based VLBI array working at sub-millimeter wavelengths and to gain ultrahigh angular resolution. To achieve this ambitious goal, the mission plan is divided into three stages. The first phase of the program is called Space Millimeter-wavelength VLBI Array (SMVA) consisting of two satellites, each carrying a 10-m diameter radio telescope into elliptical orbits with an apogee height of 60000 km and a perigee height of 1200 km. The VLBI telescopes in space will work at three frequency bands, 43, 22 and 8 GHz. The 43- and 22-GHz bands will be equipped with cryogenic receivers. The space telescopes, observing together with ground-based radio telescopes, enable the highest angular resolution of 20 micro-arcsecond ($\mu$as) at 43 GHz. The SMVA is expected to conduct a broad range of high-resolution observational research, e.g. imaging the shadow (dark region) of the supermassive black hole in the heart of the galaxy M87 for the first time, studying the kinematics of water megamasers surrounding the SMBHs, and exploring the power source of active galactic nuclei. Pre-research funding has been granted by the CAS in October 2012, to support scientific and technical feasibility studies. These studies also include the manufacturing of a prototype of the deployable 10-m space-based telescope and a 22-GHz receiver. Here we report on the latest progress of the SMVA project.

arXiv commentThe paper is presented in the 64th International Astronautical Congress (IAC) held in Beijing on 23-27 September 2013, and has been pre-selected by the session chairs for peer review process of the Acta Astronautica

References in corpus (10)

• A 4% Geometric Distance to the Galaxy NGC4258 from Orbital Motions in a Nuclear Gas Disk
• The M87 Black Hole Mass from Gas-dynamical Models of Space Telescope Imaging Spectrograph Observations
• The Black Hole Mass, Stellar M/L, and Dark Halo in M87
• RadioAstron -- a Telescope with a Size of 300 000 km: Main Parameters and First Observational Results
• The ACS Virgo Cluster Survey X. Half-light Radii of Globular Clusters in Early-Type Galaxies: Environmental Dependencies and a Standard Ruler for Distance Estimation
• Imaging the Black Hole Silhouette of M87: Implications for Jet Formation and Black Hole Spin
• The VSOP 5 GHz Active Galactic Nucleus Survey: V. Imaging Results for the Remaining 140 sources
• Dual-Frequency VSOP Observations of AO 0235+164
• Space-VLBI observations of OH maser OH34.26+0.15: low interstellar scattering
• Constraining the size of the dark region around the M87 black hole by space-VLBI observations

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• Analysis of Orbital Configurations for Millimetron Space Observatory
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• The Most Compact Bright Radio-loud AGN -- II. VLBA Observations of Ten Sources at 43 and 86~GHz
• The antenna phase center motion effect in high-accuracy spacecraft tracking experiments
• The optimization of satellite orbit for Space-VLBI observation
• A cosmic microscope to probe the Universe from Present to Cosmic Dawn - dual-element low-frequency space VLBI observatory
• Lunar Orbital VLBI Experiment: motivation, scientific purposes and status
• A proof-of-concept neural network for inferring parameters of a black hole from partial interferometric images of its shadow
• The antenna phase center motion effect in space-based experiments for fundamental physics and astronomy