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X-ray continuum and iron K emission line from the radio galaxy 3C 390.3X-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.
Document ID
19950035604
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Inda, M. (Univ. of Tokyo Tokyo, Japan)
Makishima, K. (Univ. of Tokyo Tokyo, Japan)
Kohmura, Y. (Univ. of Tokyo Tokyo, Japan)
Tashiro, M. (Univ. of Tokyo Tokyo, Japan)
Ohashi, T. (Tokyo Metropolitan Univ. Tokyo, Japan)
Barr, P. (EXOSAT Observatory Noordwijk, Netherlands)
Hayashida, K. (Osaka Univ. Osaka, Japan)
Palumbo, G. G. C. (Universita di Bologna Bologna, Italy)
Trinchieri, G. (Osservatorio Astrofisco di Arcetri Firenze, Italy)
Elvis, M. (Harvard-Smithsonian Center for Astrophysics, Cambridge, MA United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1994
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 420
Issue: 1
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAS8-39073
CONTRACT_GRANT: NAG8-801
CONTRACT_GRANT: NAGW-2681
Distribution Limits
Public
Copyright
Other