An extremely red nucleus in an absorbed QSO at z = 0.65

Masayuki Akiyama, Kouji Ohta

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3 Citations (Scopus)


The results of K-band-imaging observations of a candidate of an absorbed QSO at z = 0.653, AX J131831+3341, are presented. The B - K color of the object is 4.85 mag, which is much redder than optically-selected QSOs. The K-band image shows nuclear and extended components, the same as in the optical V-, R-, and J,-band images. The nuclear component (I - K = 4.29 mag) is much redder than the power-law models with energy indices of 0 to - 1.0, which well reproduce the V-R and R-I optical colors of the nuclear component. A heavily absorbed (Av ∼ 3 mag) nucleus may emerge in the K-band, while optical light may originate from scattered nuclear light. The I - K color of the extended component is 2.2 mag, which is consistent with the post-starburst nature of the host galaxy, which is also suggested from the V - R and R - I colors of the extended component.

Original languageEnglish
Pages (from-to)63-67
Number of pages5
JournalPublications of the Astronomical Society of Japan
Issue number1
Publication statusPublished - 2001
Externally publishedYes


  • Galaxies: active
  • Galaxies: individual (AX J131831+3341)
  • Galaxies: photometry
  • Quasars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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