X-ray continuum and iron K emission line from the radio galaxy 3C 390.3

Details X-ray continuum and iron K emission line from the radio galaxy 3C 390.3 X-ray continuum and iron K emission line from the radio galaxy 3C 390.3

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...420..143i&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 420, no. 1, p. 143-151

Astronomy and Astrophysics

Astronomy

25

Emission Spectra, Iron, Line Spectra, Radio Galaxies, X Ray Sources, X Ray Spectra, Astronomical Models, Continuous Radiation, Exosat Satellite, Ginga Satellite, Radio Astronomy

Scientific paper

X-ray properties of the radio galaxy 3C 390.3 were investigated using the European X-ray Observatory Satellite (EXOSAT) and Ginga satellites. Long-term, large-amplitude X-ray intensity changes were detected over a period extending from 1984 through 1991, and high-quality X-ray spectra were obtained especially with Ginga. The X-ray continuum spectra were described with power-law model with photon slope in the range 1.5-1.8, and the slope flattened as the 2-20 keV luminosity decreased by 40%. There was a first detection of the iron emission line from this source at the 90% confidence level. An upper limit was derived on the thermal X-ray component. X-ray emission mechanisms and possible origins of the long-term variation are discussed.

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