Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.265..412w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 265, p. 412
Astronomy and Astrophysics
Astronomy
44
X Ray Sources, X Ray Spectra, Line Spectra, Active Galactic Nuclei, Abundance, Iron, Astronomical Models, Spectrum Analysis
Scientific paper
We present the results of Ginga observations of three narrow emission line X-ray galaxies, NGC 7172, NGC 7582, and ESO 103-G35. In each of these galaxies the column density along the line of sight to the active nucleus is extremely high. A comparison of the optical depth in the iron K-edge with the low-energy absorption in the X-ray spectrum indicates an apparent iron abundance in excess of the solar value in these sources. Measurements of the iron K-edge energy show that the bulk of the X-ray-absorbing gas is not strongly photoionized, with only ESO 103-G35 exhibiting an edge energy significantly above that for neutral iron. In the case of NGC 7582, the line-of-sight column density may have increased by a factor of about 3 over an interval of about 4 yr. The implications of these results for current models of the state and distribution of gaseous material in low-luminosity AGN are briefly discussed.
Kohmura Yoshiki
Makishima Kazuo.
Ohashi Takuma
Sembay Steve
Tashiro Motomichi
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