Re: Calculation of error ?
Posted by
karenacollins on
May 19, 2021; 8:55pm
URL: http://astroimagej.170.s1.nabble.com/Calculation-of-error-tp1561p1563.html
Hi Pieter,
Yes, AMag error is in magnitude. However, Source_Error is in ADU (or
counts), rather than magnitude. The error will always be given in
the same units as the value.
Appendix D in the
AIJ paper here
describes most or all of the data values found in the measurements
table.
Regarding your question: "Do I still have to enter values for the
readout and dark current noise, when treating them as in Image
Sequence in AstroImageJ ? I did enter the e/ADU value for the gain
of the camera, and left those two other values at zero."
- AIJ will still work correctly if readout and dark current are set
to zero. However, the photometric errors/uncertainties may be
underestimated. This will be less of an issue for bright targets,
and more of an issue for faint targets. In either case, only the
calculated uncertainties will be affected, not the nominal measured
values.
Karen