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An intercontinental array--a next-generation radio telescope.

G W Swenson, K I Kellermann

    Science (New York, N.Y.)
    |June 27, 1975
    PubMed
    Summary
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    Constructing a Very Long Baseline Array (VLBA) is feasible at a cost of approximately $20 million. This intercontinental radio telescope array will offer unprecedented angular resolution for astronomical studies.

    Area of Science:

    • Astronomy and Astrophysics
    • Radio Astronomy
    • Instrument Engineering

    Background:

    • Estimating the cost of large scientific instruments is challenging.
    • Many components for the Very Long Baseline Array (VLBA) are existing or in fabrication.
    • The Very Large Array (VLA) is currently under construction.

    Purpose of the Study:

    • To estimate the construction cost of an intercontinental Very Long Baseline Array (VLBA).
    • To assess the feasibility of achieving sub-milliarcsecond resolution in radio astronomy.
    • To determine if such an instrument is comparable in cost to existing large radio telescopes.

    Main Methods:

    • Cost estimation based on existing and fabricated components (antennas, electronic systems).
    • Inclusion of costs for radiometers, frequency standards, computers, recorders, and playback facilities.

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  • Consideration of an alternative design using a geostationary communication satellite for data transmission.

    • Main Results:

    • The estimated cost for a ten-element VLBA using tape recorders is approximately $20 million.
    • An alternative design with satellite data transmission would cost an additional $30 million to $50 million.
    • The total cost is comparable to existing large radio telescopes and arrays.

    Conclusions:

    • It is feasible to construct an intercontinental VLBA at a reasonable cost.
    • The VLBA will provide sub-milliarcsecond resolution, complementing the VLA.
    • This advancement will enable the study of the universe with unprecedented angular resolution.