TY - JOUR
T1 - Detection of strong Fe-K lines from the spiral galaxies NGC 1365 and NGC 1386
AU - Iyomoto, Naoko
AU - Makishima, Kazuo
AU - Fukazawa, Yasushi
AU - Tashiro, Makoto
AU - Ishisaki, Yoshitaka
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1997
Y1 - 1997
N2 - 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 [NH = (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).
AB - 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 [NH = (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).
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U2 - 10.1093/pasj/49.4.425
DO - 10.1093/pasj/49.4.425
M3 - Article
AN - SCOPUS:0031286760
VL - 49
SP - 425
EP - 434
JO - Publication of the Astronomical Society of Japan
JF - Publication of the Astronomical Society of Japan
SN - 0004-6264
IS - 4
ER -