Signs of active galactic nucleus quenching in a merger remnant with radio jets

Kohei Ichikawa, Junko Ueda, Megumi Shidatsu, Taiki Kawamuro, Kenta Matsuoka

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We investigate optical, infrared, and radio active galactic nucleus (AGN) signs in the merger remnant Arp 187, which hosts luminous jets launched in the order of 105 yr ago but whose present-day AGN activity is still unknown. We find AGN signs from the optical Baldwin-Phillips-Telervich diagram and infrared [O iv] 25.89 μm line, originating from the narrow line regions of AGN. On the other hand, Spitzer/IRS show host galaxy dominated spectra, suggesting that the thermal emission from the AGN torus is considerably small or already diminished. Combining the black hole mass, the upper limit of radio luminosity of the core, and the fundamental plane of the black hole enables us to estimate X-ray luminosity, which gives <1040 erg s-1. Those results suggest that the AGN activity of Arp 187 has already been quenched, but the narrow line region is still alive owing to the time delay of emission from the past AGN activity.

Original languageEnglish
JournalPublications of the Astronomical Society of Japan
Issue number1
Publication statusPublished - 2016 Feb 1
Externally publishedYes


  • galaxies: active
  • galaxies: nuclei
  • infrared: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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