We present evidence for a dual Active Galactic Nucleus ( AGN ) within an early-type galaxy at z = 0.709 in the Extended Groth Strip .
The galaxy lies on the red sequence , with absolute magnitude M _ { B } = -21.0 ( AB , with h = 0.7 ) and rest-frame color U - B = 1.38 .
Its optical spectrum shows strong , double-peaked [ O iii ] emission lines and weak H \beta emission , with Seyfert-like line ratios .
The two narrow peaks are separated by 630 \mathrm { km s ^ { -1 } } in velocity and arise from two distinct regions , spatially resolved in the DEIMOS spectrum , with a projected physical separation of 1.2 kpc . HST /ACS imaging shows an early-type ( E/S0 ) galaxy with hints of disturbed structure , consistent with the remnant of a dissipationless merger .
Multiwavelength photometric information from the AEGIS consortium confirms the identification of a dust-obscured AGN in an early-type galaxy , with detections in X-ray , optical , infrared and radio wavebands .
These data are most readily explained as a single galaxy harboring two AGN—the first such system to be observed in an otherwise typical early-type galaxy .