A hard X-ray constraint on the presence of an AGN in the ultraluminous infrared galaxy Arp 220
A hard X-ray constraint on the presence of an AGN in the ultraluminous infrared galaxy Arp 220
We present X-ray results on the ultraluminous infrared galaxy Arp 220 obtained with BeppoSAX. X-ray emission up to 10 keV is detected. No significant signal is detected with the PDS detector in the higher energy band. The 2–10 keV emission has a flat spectrum (Γ∼1.7), similar to M82, and a …