AAS 207th Meeting, 8-12 January 2006
Session 80 Evolution of Galaxies, Galaxies Surveys II
Poster, Tuesday, 9:20am-6:30pm, January 10, 2006, Exhibit Hall

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[80.09] A Binary AGN at z=0.71 in the Extended Groth Strip

B. F. Gerke (University of California-Berkeley), Extended Groth Strip Collaboration

We present spectroscopic evidence from the DEEP2 survey for a galaxy hosting a binary active nucleus at redshift z=0.71 in the Extended Groth Survey Strip. The optical spectrum shows very unusual spectral features, including very bright, double-horned [OIII] emission, with peaks separated by several hundred km/s in velocity space and approximately one kpc projected on the sky. In addition, we present imaging and flux measurements for this object across a wide range of wavelengths, from radio to X-ray. HST/ACS imaging of the host galaxy appears to show an elliptical that has recently undergone a dissipationless (gas-free) merger. Binary AGN are rare---only a few examples are known---but the study of such objects is important for understanding both the formation of cores in elliptical galaxies and the growth of supermassive black holes.

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