[daip] JMFIT

[Ian Pattison]

Using JMFIT I'm a little uncertain as to what effect the size of the
fitting regions has (i.e. setting blc and trc). For example when I use a
small box, of similar size to the source at it's 3 sigma level, I get a
deconvolved size of 0 in the minor axis. The source does look (fairly)  
un-resolved (it's not exactly circular, like the beam). If I set the
fitting region so that it encompasses all the 3 sigma emmision and above,
then presumably I'm missing out all the emission weaker than this (though
it'll be hidden within the noise). When I use a slightly larger area I see
that the deconvolved axes increase in size, as I increase the box size.
How can I decide what the 'best' or 'correct' size fitting region to use
is?



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 Ian Pattison 

 Astrophysics Group 
 School of Physics & Astronomy
 University of Leeds
 LS2 9JT
 United Kingdom

 Tel: +44 (0)113 3433872
 email: ip at ast.leeds.ac.uk
 WWW: http://ast.leeds.ac.uk/~ip

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