Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399l.129k&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 399, no. 2, p. L129-L131.
Astronomy and Astrophysics
Astrophysics
19
Active Galactic Nuclei, Emission Spectra, Radio Galaxies, Seyfert Galaxies, X Ray Spectra, Absorption Spectra, Ginga Satellite, Light Curve
Scientific paper
We report the first detection of hard X-rays (above 2 keV), from the narrow-line radio galaxy (NLRG) IC 5063. The hard X-ray spectrum is described by a power-law photon index of 1.5 with a large absorption corresponding to the N(H) value of 2 x 10 exp 23 H/sq cm. The X-ray luminosity (2-20 keV band) after the correction of the absorption is 2.5 x 10 exp 43 ergs/s. Since the X-ray luminosity and spectral index are in the range found for Seyfert 1's and broad-line radio galaxies (BLRG), we conclude that IC 5063 has an intrinsic BLRG type nucleus hidden behind a high gas column. There is a hint of X-ray flux variations with time scales between 1000 s and 10 hr which, if confirmed, would further support that the hard X-rays are the direct beam from a compact nucleus penetrating the high gas column.
Awaki Hisamitu
Iwasawa Kazushi
Koyama Katsuji
Ward Martin J.
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