NuSTAR Non-detection of a Faint Active Galactic Nucleus in an Ultraluminous Infrared Galaxy with Kpc-scale Fast Wind

Xiaoyang Chen, Kohei Ichikawa, Hirofumi Noda, Taiki Kawamuro, Toshihiro Kawaguchi, Yoshiki Toba, Masayuki Akiyama

Research output: Contribution to journalArticlepeer-review

Abstract

Large-scale outflows are generally considered to be possible evidence that active galactic nuclei (AGNs) can severely affect their host galaxies. Recently, an ultraluminous infrared galaxy (ULIRG) at z = 0.49, AKARI J0916248+073034, was found to have a galaxy-scale [O iii] λ 5007 outflow with one of the highest energy-ejection rates at z < 1.6. However, the central AGN activity estimated from its torus mid-infrared (MIR) radiation is weak relative to the luminous [O iii] emission. In this work we report the first NuSTAR hard X-ray follow-up of this ULIRG to constrain its current AGN luminosity. The intrinsic 2-10 keV luminosity shows a 90% upper limit of 3.0 × 1043 erg s-1 assuming Compton-thick obscuration (N H = 1.5 × 1024 cm-2), which is only 3.6% of the luminosity expected from the extinction-corrected [O iii] luminosity. Using the NuSTAR observation, we successfully identify that this ULIRG has a very extreme case of X-ray deficit among local ULIRGs. A possible scenario to explain the drastic decline in both the corona (X-ray) and torus (MIR) is that the primary radiation from the AGN accretion disk is currently in a fading status, as a consequence of a powerful nuclear wind suggested by powerful ionized outflow in a galaxy scale.

Original languageEnglish
Article numberL2
JournalAstrophysical Journal Letters
Volume905
Issue number1
DOIs
Publication statusPublished - 2020 Dec 4

Keywords

  • Active galaxies (17)
  • Ultraluminous infrared galaxies (1735)
  • X-ray active galactic nuclei (2035)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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