Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..411..255p&link_type=abstract
Astronomical Data Analysis Software and Systems XVIII ASP Conference Series, Vol. 411, proceedings of the conference held 2-5 No
Astronomy and Astrophysics
Astronomy
2
Scientific paper
Wide field interferometric radio images often contain a remarkable population of faint compact sources. Due to their low intensity/noise ratio, these objects can be easily missed by automated detection methods. We present in this paper a novel detection algorithm based on the structural behaviour of the neighbourhood around each studied pixel. This structural analysis is performed by defining an intensity contrast radial function and analyzing the behaviour of its slope. Our method allows using very low thresholds for the detection of sources with intensities similar to noise levels. As an example we show the validity of our approach with an image from the radio surveys recently performed in the Cygnus OB2 region using the GMRT interferometer at 610 MHz.
Freixenet J.
Lladó J.
Marti James
Paredes Javier M.
Peracaula Marta
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