Detection of strong Fe-K lines from the spiral galaxies NGC 1365 and NGC 1386

Two spiral galaxies, NGC 1365 and NGC 1386, were observed in X-rays with ASCA. Both galaxies exhibit hard X-ray emission from point-like sources at the nuclei. The continuous spectrum of NGC 1365 was fitted well with a power-law of photon index 0.8^+0.7_-0.2, whose 2-10 keV luminosity is (3.8±0.5) × 10⁴⁰ erg s^-1 for an assumed distance of 18.4 Mpc. NGC 1386 has an absorbed [N_H = (2.8^+2.7_-2.6) × 10²³ cm^-2] power-law continuum, whose 2-10 keV luminosity (at 18.4 Mpc) is (2.6^+3.2_-2.0) × 10⁴⁰ erg s^-1 after removing the absorption. A broad (σ = 0.20^+0.16_-0.08 keV) Fe-K emission line centered at 6.61^+0.08_-0.06 keV was detected from the NGC 1365 nucleus at an equivalent width of 2.1^+2.1_-0.3 keV. The Fe-K line was also detected from NGC 1386 at an equivalent width of 1.6^+7.9_-1.2 keV and at a similar energy as the NGC 1365 line. These spectral features indicate that both galaxies host low-luminosity active galactic nuclei (LLAGNs).