Low-luminosity x-ray active galactic nuclei in S0 galaxies NGC 3065 and NGC 4203

Naoko Iyomoto, Kazuo Makishima, Kyoko Matsushita, Yasushi Fukazawa, Makoto Tashiro, Takaya Ohashi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We present ASCA X-ray results on two S0 galaxies, NGC 3065 and NGC 4203. In both galaxies, we detected hard X-ray emission from a pointlike source at the nucleus. A single power-law model having a photon index of ∼ 1.8 well described the spectra of these sources, while thin thermal emission, which is common in S0 galaxies, was not detected. The 2-10 keV luminosities of these nuclear sources (2.2 × 1041 and 1.5 × 1040 ergs s-1) are 1-2 orders of magnitude higher than those expected as an assembly of low-mass X-ray binaries in these galaxies. Our results strongly suggest that NGC 3065 and NGC 4203 host low-luminosity active galactic nuclei.

Original languageEnglish
Pages (from-to)168-173
Number of pages6
JournalAstrophysical Journal
Issue number1 PART I
Publication statusPublished - 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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