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publication

X-ray continuum and evidence for an iron emission line from the quasar E1821 + 643

T. Kii, O.R. Williams, T. Ohashi, H. Awaki K. Hayashida, H. Inoue, H. Kondo, K. Koyama, F. Makino, K. Makishima, R.D. Saxton, G.C. Stewart, S. Takano, Y. Tanaka and M.J.L. Turner

Abstract

This paper reports on the 2-10 keV spectrum of the quasar E1821 + 643, obtained with the large-area proportional counters aboard the Ginga spacecraft on two occasions: May 12-14, 1987 and September 27, 1988. The spectrum shows strong evidence for the presence of a redshifted iron K emission line of a 5.1 + or - 0.2 keV energy, and an observed equivalent width of 210 + or - 80 eV. The E1821 + 643 appeared to be embedded within a cluster of galaxies which could contribute part of the observed line. A possibility is suggested that iron emission lines may be a common feature in X-ray spectra of quasars.

 
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