[daip] AIPS-JMFIT HELP

[Eric Greisen]

Poonam Chandra writes:
 > Hi,
 > 
 > I have a very silly confusion. When we run JMFIT, it gives errors in
 > co-ordinates too. Eg:
 > 
 > localh> JMFIT1: Component   1-Gaussian
 > localh> JMFIT1:   Peak intensity    = 1.1682E-04 +/-  3.21E-05 JY/BEAM
 > localh> JMFIT1:   Integral intensity= 1.7606E-04 +/-  7.39E-05 JANSKYS
 > localh> JMFIT1:   X-position        =    472.893 +/-   0.5412 pixels
 > localh> JMFIT1:   Y-position        =    444.888 +/-   0.7005 pixels
 > localh> JMFIT1:                       RA 22 42 34.81257    +/-  0.0070930
 > localh> JMFIT1:                       DEC 23 42 52.8398    +/-   0.126082
 > 
 > My question is, what are the units of error:
 > Eg: RA=22h 42m 34.8s +/- 0.007
 > 
 > Is this 0.007h or 0.007s?
 > 
 > Similarly in Dec, is it 0.126 degrees or 0.126"?
 > 

You can check this answer by comparing the errors in pixels with your
pixel size.  The RA error is in seconds of time and the Dec error is
in seconds of arc.  0.126 degrees would be bigger than your image
probably.

Eric Greisen