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We present the first analysis of the all-sky Swift BAT ultra hard X-ray(14-195 keV) data for a targeted list of objects. We find the BAT data can bestudied at 3x fainter limits than in previous blind detection catalogs based onprior knowledge of source positions and using smaller energy ranges for sourcedetection. We determine the AGN fraction in 134 nearby (z<0.05) luminousinfrared galaxies (LIRGS) from the GOALS sample. We find that LIRGs have ahigher detection frequency than galaxies matched in stellar mass and redshiftat 14-195 keV and 24-35 keV. In agreement with work at other wavelengths, theAGN detection fraction increases strongly at high IR luminosity with half ofhigh luminosity LIRGs (50%, 6/12, log L_IR/L_sun>11.8) detected. The BAT AGNclassification shows 97% (37/38) agreement with Chandra and XMM AGNclassification using hardness ratios or detection of a iron K-alpha line. Thisconfirms our statistical analysis and supports the use of the Swift BAT all-skysurvey to study fainter populations of any category of sources in the ultrahard X-ray band. BAT AGN in LIRGs tend to show higher column densities with40\pm9% showing 14-195 keV/2-10 keV hardness flux ratios suggestive of high orCompton-thick column densities (log N_H>24 cm^-2), compared to only 12\pm5% ofnon-LIRG BAT AGN. We also find that using specific energy ranges of the BATdetector can yield additional sources over total band detections with 24%(5/21) of detections in LIRGs at 24-35 keV not detected at 14-195 keV.

Studying Faint Ultra Hard X-ray Emission from AGN in GOALS LIRGs with Swift BAT