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New-generation radio interferometer

  • V. S. Artyukh
Article
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Studies of physical conditions in active galactic nuclei and cosmological studies require low-frequency observations of compact radio sources with high sensitivity and resolution. To advance considerably in this research, observations in the meter wavelength range with a sensitivity of about 1 mJy are needed. The sensitivity of low-frequency observations of extragalactic radio sources is limited by the confusion effect. To suppress it to a 1 mJy level, one needs antennas with apertures of 300–400 km. Currently, new-generation SKA and LOFAR radio telescopes are developed, which are aperture-synthesis systems based on small antennas which have dimensions of several hundreds of kilometers. Such measuring complexes will allow one to achieve a sensitivity of 1 mJy. In this work, we propose to make an interferometer with baseline exceeding 5000 km on the basis of in-phase kilometer antenna arrays. It is shown that such a system will have a sensitivity of about 1 mJy at a frequency of 100 MHz. Along with the high sensitivity, the proposed interferometer based on diffraction gratings will make it possible to form a multilobe directional pattern that will cover the entire observable hemisphere in terms of inclination. This opens up new opportunities for fast surveys of weak small-size radio sources.

Keywords

Radio Source Antenna Array Active Galactic Nucleus Radio Telescope Extragalactic Radio Source 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media, Inc. 2011

Authors and Affiliations

  1. 1.P.N. Lebedev Physical Institute of the Russian Academy of SciencesMoscowRussia

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