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We present the results from a Chandra pilot study of 12 massive galaxymergers selected from Galaxy Zoo. The sample includes major mergers down to ahost galaxy mass of 10$^{11}$ $M_\odot$ that already have optical AGNsignatures in at least one of the progenitors. We find that the coincidences ofoptically selected active nuclei with mildly obscured ($N_H \lesssim 1.1 \times10^{22}$ cm$^{-2}$) X-ray nuclei are relatively common (8/12), but thedetections are too faint ($< 40$ counts per nucleus; $f_{2-10 keV} \lesssim 1.2\times 10^{-13}$ erg s$^{-1}$ cm$^{-2}$) to reliably separate starburst andnuclear activity as the origin of the X-ray emission. Only one merger is foundto have confirmed binary X-ray nuclei, though the X-ray emission from itssouthern nucleus could be due solely to star formation. Thus, the occurrencesof binary AGN in these mergers are rare (0-8%), unless most merger-inducedactive nuclei are very heavily obscured or Compton thick.

Chandra Observations of Galaxy Zoo Mergers: Frequency of Binary Active Nuclei in Massive Mergers