Orbiting VLBI: A Survey

The Very-Long-Baseline Interferometry technique is not limited by the size of the Earth. Near-Earth-orbiting space vehicles can carry radio telescopes that can serve as VLBI stations using existing technology. By proper use of ground VLB arrays, a single orbiting VLBI satellite can yield radio maps with 2-dimensional coverage and high dynamic range at all declinations. A single orbiter can be used out to orbits that yield an effective aperture greater than two Earth diameters. Interstellar scintillations are a limiting factor only in the micro-arc-second range.

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Parsec-Scale Structure of Compact Radio Sources

Symposium - International Astronomical Union ◽

10.1017/s0074180900079808 ◽

1996 ◽

Vol 175 ◽

pp. 5-10 ◽

Cited By ~ 1

Author(s):

J. A. Zensus

Keyword(s):

Very Long Baseline Interferometry ◽

Dynamic Range ◽

High Dynamic Range ◽

Radio Sources ◽

High Dynamic Range Imaging ◽

Range Imaging ◽

Long Baseline ◽

High Dynamic ◽

Scale Properties ◽

Made In

High-dynamic range imaging and monitoring with Very Long Baseline Interferometry have considerably increased our knowledge of the parsec-scale properties of compact radio sources. I review some of the properties of individual sources in areas where particular progress has been made in the last few years.

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Australian square kilometre array pathfinder: I. system description

Publications of the Astronomical Society of Australia ◽

10.1017/pasa.2021.1 ◽

2021 ◽

Vol 38 ◽

Author(s):

A. W. Hotan ◽

J. D. Bunton ◽

A. P. Chippendale ◽

M. Whiting ◽

J. Tuthill ◽

...

Keyword(s):

Galaxy Formation ◽

Large Scale ◽

Dynamic Range ◽

High Dynamic Range ◽

Radio Telescopes ◽

System Description ◽

Square Kilometre Array ◽

Science Operations ◽

High Dynamic ◽

Radio Transients

Abstract In this paper, we describe the system design and capabilities of the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope at the conclusion of its construction project and commencement of science operations. ASKAP is one of the first radio telescopes to deploy phased array feed (PAF) technology on a large scale, giving it an instantaneous field of view that covers $31\,\textrm{deg}^{2}$ at $800\,\textrm{MHz}$ . As a two-dimensional array of 36 $\times$ 12 m antennas, with baselines ranging from 22 m to 6 km, ASKAP also has excellent snapshot imaging capability and 10 arcsec resolution. This, combined with 288 MHz of instantaneous bandwidth and a unique third axis of rotation on each antenna, gives ASKAP the capability to create high dynamic range images of large sky areas very quickly. It is an excellent telescope for surveys between 700 and $1800\,\textrm{MHz}$ and is expected to facilitate great advances in our understanding of galaxy formation, cosmology, and radio transients while opening new parameter space for discovery of the unknown.

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