deletions | additions       diff --git a/subsection_Comparison_with_X_ray__.tex b/subsection_Comparison_with_X_ray__.tex  index de43e68..0174a87 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 $z<0.05$ from the BAT survey. Using the following:, following: radial velocity differences $< 300 km.s^{−1}$,  as sample selection criteria, Koss defined a sample of 16 dual AGN to study. Koss'aim was to discover the the peak black hole growth during the merging process. This study also encounters limitations due to hardware, causing incompleteness data collection at close scales (small redshift). These limitations are overcome by using emission line diagnostics. 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.