Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7896
Title: A minimal space interferometer configuration for imaging at low radio frequencies
Authors: Jaini, Akhil
Deshpande, Avinash A
Bitragunta, Sainath
Keywords: radio astronomy
radio interferometers
space telescopes
very long baseline interferometry
artificial satellites
space observatories
Issue Date: Aug-2021
Publisher: Cambridge University Press
Citation: Publications of the Astronomical Society of Australia, Vol. 38, e040
Abstract: The radio sky at lower frequencies, particularly below 20 MHz, is expected to be a combination of increasingly bright non-thermal emission and significant absorption from intervening thermal plasma. The sky maps at these frequencies cannot therefore be obtained by simple extrapolation of those at higher frequencies. However, due to severe constraints in ground-based observations, this spectral window still remains greatly unexplored. In this paper, we propose and study, through simulations, a novel minimal configuration for a space interferometer system which would enable imaging of the radio sky at frequencies well below 20 MHz with angular resolutions comparable to those achieved at higher radio frequencies in ground-based observations by using the aperture synthesis technique. The minimal configuration consists of three apertures aboard Low Earth Orbit (LEO) satellites orbiting the Earth in mutually orthogonal orbits. Orbital periods for the satellites are deliberately chosen to differ from each other so as to obtain maximum (u,v) coverage in short time spans with baselines greater than 15 000 km, thus, giving us angular resolutions finer than 10 arcsec even at these low frequencies. The sensitivity of the (u,v) coverage is assessed by varying the orbit and the initial phase of the satellites. We discuss the results obtained from these simulations and highlight the advantages of such a system
Description: Restricted Access
URI: http://hdl.handle.net/2248/7896
ISSN: 1448-6083
Appears in Collections:IIAP Publications

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