Swarup, G. (1984) The Ooty synthesis radio telescope: first results Journal of Astrophysics and Astronomy, 5 (2). pp. 139-148. ISSN 0250-6335
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Official URL: http://www.ias.ac.in/jarch/jaa/5/139-148.pdf
Related URL: http://dx.doi.org/10.1007/BF02714986
Abstract
A 4-km synthesis radio telescope has recently been commissioned at Ootacamund, India for operation at 327 MHz. It consists of the Ooty Radio Telescope (530 m × 30 m) and 7 small antennas which are distributed over an area of about 4 km × 2 km. It has a coverage of about ± 40° in declination δ. The beam-width is about 40 arcsec × 90 arcsec at δ = 0° and about 40 arcsec × 50 arcsec at δ = 40°. The sensitivity attained for a 5:1 signal-to-noise ratio is about 15 m Jy after a 10-hour integration. The observational programmes undertaken and some of the results obtained recently are summarized. The radio halo around the edge-on spiral NGC 4631 is found to have a larger scale-height at 327 MHz than is known at higher frequencies. Mapping of interesting radio galaxies at 327 MHz is being carried out; preliminary results for 0511-305 (~2 Mpc) and 1333-337 (~750 kpc) are summarized. The very-steep-spectrum radio source in the Abell cluster A85 is found to be resolved; since it has no obvious optical counterpart, it is conceivable that it is a remnant of past activity of a galaxy that has drifted away in about 109 years.
Item Type: | Article |
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Source: | Copyright of this article belongs to Indian Academy of Sciences. |
Keywords: | Radio Telescopes; Galaxies; Radio; Galaxies; Spiral |
ID Code: | 57670 |
Deposited On: | 29 Aug 2011 08:31 |
Last Modified: | 18 May 2016 08:59 |
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