deletions | additions       diff --git a/subsection_Comparison_with_X_ray__.tex b/subsection_Comparison_with_X_ray__.tex  index 64c4f0d..f942fd3 100644  --- a/subsection_Comparison_with_X_ray__.tex  +++ b/subsection_Comparison_with_X_ray__.tex 
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Both \cite{Liu_2011} and \cite{Koss_2012} use imaging spectroscopy to select data points for dual (pair) AGN samples. A small pair separation is also present in both studies with most of the Lui AGN detections at separation less than 100 kpc, and those of \cite{Koss_2012} found at separations less than 30 kpc. Both papers note that the luminosities of AGN pairs increase with a decrease in separation between galaxies (in a pair), suggesting that mergers promote AGN activity (\cite{Liu_2011} , \cite{Koss_2012}). Both papers also acknowledge the limitations experienced in selecting the appropriate sample data due to SDSS’ fixed fiber size. On this point, Koss notes that due to SDSS fiber being 3”, it is sensitive to smaller physical scales.  Koss studies a sample of 167 X-ray selected AGN pairs at $z<0.05$. Using the following:, as ssample selection criteria, Koss defined a sample of 16 dual AGN to study. The Koss'aim was to discover the the peak black hole growth during the merging process.The  study by \cite{Koss_2011} provides evidence for merging events enhancing AGN activity as their results show that the X-ray luminosity of both AGN (in an AGN pair), increases strongly with decreasing pair separation. Both studies show that an increase in AGN activity due to mergers even though AGN selection criterion , and emission mechanism ()radio versus X-ray) differ.