Re: Source-Sky-Tnn
Posted by
karenacollins on
Apr 29, 2018; 1:44am
URL: http://astroimagej.170.s1.nabble.com/Source-Sky-Tnn-tp994p996.html
Hi,
Source-Sky_Txx is the actual number of ADU (after background subtraction) within the photometric aperture. There is no normalization in those values.
See Appendix D in the expanded AIJ paper for a description of all of the data columns in the measurements table:
https://arxiv.org/abs/1701.04817
I'm not sure why those values are so low. They look more like rel_flux_Txx values. I suppose if your exposure time is really short, they could be correct.
Karen
On 4/28/2018 4:37 PM, CraigNZ [via AstroImageJ] wrote:
A quick question, in the measurements table for two stars I see the values:
10.818625 (9th mag star)
0.586212 (13th mag star)
What units are these numbers in? How would I convert them back to electrons?