Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23..158o&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 158-158
Astronomy and Astrophysics
Astronomy
Scientific paper
Determining the size of the emitting region in extended extragalactic radio sources is important to understand the physical processes taking place in their radio lobes or bridges. The width of the bridge (W) can be estimated either by fitting a gaussian to the surface brightness distribution and taking its full width (WG) or by calculating the second moment of the distribution (WS). However, these two methods give quite different results with the average ratio between WG and WS being as large as ~2-3. In order to test the methods we have studied the radio surface brightness from a model source having a cylindrical shape and calculated WG and WS for five different radial emissivity distributions. We find that, while the second moment always underestimate the source width, the gaussian fit gives a better estimate of W. We also find that the ratio WG/WS can be used to distinguish between different emissivity distributions. Our results indicate that in real sources the emissivity tends to peak off the source axis.
Carvalho João C.
Daly Ruth A.
O'Dea Christopher P.
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