Low-luminosity X-ray Active Nuclei in S0 galaxies NGC 3065 and NGC 4203
Naoko Iyomoto, Kazuo Makishima, Kyoko Matsushita, Yasushi Fukazawa, Makoto Tashiro, Takaya Ohashi
Abstract
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 point-like source at the nucleus. 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 times 1041 erg s-1 and 1.5 times 1040 erg 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 (LLAGNs).
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