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Edward Brown edited figures/fig_for_inclass_nova1/caption.tex
about 9 years ago
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\label{fig:inclass_lab}
Figure supporting an in-class exercise on understanding image values and signal-to-noise, carried out during the lab period. The exercise itself consisted of the following:
\itshape
Consider the attached image of a nova observed with the millimeter telescope CARMA at 96 GHz (Panel A). Histograms of pixel values are shown in Panels B and C (Panel C is just a zoom-in of a region on Panel B); these are just like the histograms you made in DS9's \verb|Scale Parameters|. The pixel values after calibration are expressed as flux density per pixel (units of mJy/pixel). The plotted range ($-2$ to $36\,\mathrm{mJy/pixel}$) includes all pixels in the image.
\noindent \emph{1) Estimate the average background value ($\bar{S}$) and explain your reasoning.}\\
\noindent \emph{2) Estimate the standard deviation of the background ($\sigma$), and explain your reasoning.}\\