Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990japa...11..311d&link_type=abstract
Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 11, Sept. 1990, p. 311-322.
Astronomy and Astrophysics
Astronomy
3
Algorithms, Astronomical Maps, Point Spread Functions, Radio Telescopes, Sky Surveys (Astronomy)
Scientific paper
A simple but effective modification to the conventional CLEAN algorithm is suggested. This modification ensures both stability and speed when CLEAN is applied to maps containing a mixture of point sources and extended structures. The method has been successfully applied to the recently completed sky survey at 34.5 MHz (Dwarakanath and Udaya Shankar, 1990). This survey was made using the Gauribidanur T array in one-dimension aperture synthesis mode. Since in this case the 'dirty beam' (point spread function) cannot be directly computed, a method to obtain this is discussed in detail. The results of this deconvolution procedure have been encouraging in terms of reduced computing time and improved dynamic range in the maps. This algorithm should find wider application in deconvolving maps which have both extended structures and point sources.
Deshpande Akshay
Dwarakanath K. S.
Shankar Udaya N.
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