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

Naoko Iyomoto, Kazuo Makishima, Yasushi Fukazawa, Makoto Tashiro, Yoshitaka Ishisaki

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46 Citations (Scopus)

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+0.7-0.2, 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).

Original languageEnglish
Pages (from-to)425-434
Number of pages10
JournalPublications of the Astronomical Society of Japan
Volume49
Issue number4
DOIs
Publication statusPublished - Jan 1 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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