THE COMPLETE INFRARED VIEW of ACTIVE GALACTIC NUCLEI from the 70 MONTH SWIFT/BAT CATALOG

Kohei Ichikawa, Claudio Ricci, Yoshihiro Ueda, Kenta Matsuoka, Yoshiki Toba, Taiki Kawamuro, Benny Trakhtenbrot, Michael J. Koss

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

We systematically investigate the near- to far-infrared (FIR) photometric properties of a nearly complete sample of local active galactic nuclei (AGNs) detected in the Swift/Burst Alert Telescope (BAT) all-sky ultra-hard X-ray (14-195 keV) survey. Out of 606 non-blazar AGNs in the Swift/BAT 70 month catalog at high galactic latitudes of(b) > 10° , we obtain IR photometric data of 604 objects by cross-matching the AGN positions with catalogs from the WISE, AKARI, IRAS, and Herschel infrared observatories. We find a good correlation between the ultra-hard X-ray and mid-IR luminosities over five orders of magnitude (41 < log L14-195 < 46). Informed by previous measurements of the intrinsic spectral energy distribution of AGNs, we find FIR pure-AGN candidates whose FIR emission is thought to be AGN-dominated with low star-formation activity. We demonstrate that the dust covering factor decreases with the bolometric AGN luminosity, confirming the luminosity-dependent unified scheme. We also show that the completeness of the WISE color-color cut in selecting Swift/BAT AGNs increases strongly with 14-195 keV luminosity.

Original languageEnglish
Article number74
JournalAstrophysical Journal
Volume835
Issue number1
DOIs
Publication statusPublished - 2017 Jan 20
Externally publishedYes

Keywords

  • X-rays: galaxies
  • galaxies: active
  • galaxies: nuclei
  • infrared: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Ichikawa, K., Ricci, C., Ueda, Y., Matsuoka, K., Toba, Y., Kawamuro, T., Trakhtenbrot, B., & Koss, M. J. (2017). THE COMPLETE INFRARED VIEW of ACTIVE GALACTIC NUCLEI from the 70 MONTH SWIFT/BAT CATALOG. Astrophysical Journal, 835(1), [74]. https://doi.org/10.3847/1538-4357/835/1/74