2019AJ....157..233R

We present the X-ray properties of 108 Dust-Obscured Galaxies (DOGs; F_24 µm_/FR_ > 1000) in the COSMOS field, all of which are detected in at least three far-infrared bands with the Herschel Observatory. Out of the entire sample, 22 are individually detected in the hard 2-8 keV X-ray band by the Chandra COSMOS Legacy survey, allowing us to classify them as AGN. Six (27%) of them are Compton-thick AGN candidates with column densities N_H > 10²⁴ cm^–2, while 15 are moderately obscured AGNs with 10²² < N_H < 10²⁴ cm^–2. Additionally, we estimate AGN contributions to the IR luminosity (8-1000 µm rest-frame) greater than 20% for 19 DOGs based on SED decomposition using Spitzer/MIPS 24 µm and the five Herschel bands (100-500 µm). Only 7 of these are detected in X-rays individually. We performed an X-ray stacking analysis for the 86 undetected DOGs. We find that the AGN fraction in DOGs increases with 24 µm flux and that it is higher than that of the general 24 µm population. However, no significant difference is found when considering only X-ray detections. This strongly motivates the combined use of X-ray and far-IR surveys to successfully probe a wider population of AGNs, particularly for the most obscured ones.