NuSTAR X-ray data put a tight upper limit on the nuclear luminosity of Arp 187, indicating its quasar engine has faded by more than a factor of 1000 within the last 10,000 years.
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NuSTAR Discovery of Dead Quasar Engine in Arp 187
NuSTAR X-ray data put a tight upper limit on the nuclear luminosity of Arp 187, indicating its quasar engine has faded by more than a factor of 1000 within the last 10,000 years.