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Title:
Detection of Strong Fe-K Lines from the Spiral Galaxies NGC 1365 and NGC 1386
Authors:
Iyomoto, Naoko; Makishima, Kazuo; Fukazawa, Yasushi; Tashiro, Makoto; Ishisaki, Yoshitaka
Affiliation:
AA(Department of Physics, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113), AB(Department of Physics, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113), AC(Department of Physics, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113), AD(Department of Physics, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113), AE(Department of Physics, School of Science, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-03})
Publication:
Publ. of the Astronomical Society of Japan, v.49, p.425-434. (PASJ Homepage)
Publication Date:
08/1997
Origin:
PASJ
PASJ Keywords:
GALAXIES: ACTIVE, GALAXIES: INDIVIDUAL (NGC 1365, NGC 1386), X-RAYS: SPECTRA
Bibliographic Code:
1997PASJ...49..425I

Abstract

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_{-0.2}(+0.7) , whose 2--10 keV luminosity is (3.8+/-0.5)times 10(40) erg s(-1) for an assumed distance of 18.4 Mpc. NGC 1386 has an absorbed [N_H = (2.8(+2.7_-2.6) *E({23)) cm(-2) ] power-law continuum, whose 2--10 keV luminosity (at 18.4 Mpc) is (2.6_{-2.0}(+3.2})*E({40)) erg s(-1) after removing the absorption. A broad (sigma =0.20(+0.16}_{-0.08) keV) Fe-K emission line centered at 6.61_{-0.06}(+0.08) 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_{-1.2}(+7.9) 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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