Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-08-17
Astronomy and Astrophysics
Astrophysics
15 pages, 5 ps figures, accepted for publication in the Astrophysical Journal
Scientific paper
10.1086/308341
We have detected an emission line feature at 4 keV in the X-ray emission from a sky region including the distant radio galaxy 3C220.1(z=0.62) obtained with ASCA. The line energy is 6.1 - 7.0 keV (90% confidence) in the rest frame of 3C220.1. Within the present statistics, the observed spectra are consistent with two different models: a non-thermal model consisting of a power-law continuum plus a 6.4 keV iron emission line, and a Raymond-Smith thin-thermal emission model of kT ~6 keV with a metal abundance of ~0.5 solar. However, because of the large (~ 500 eV) equivalent width of the line, a significant fraction of the X-ray emission is likely to arise from the hot intracluster gas associated with the galaxy cluster that includes 3C220.1. The spectral parameters of the thermal emission are consistent with the luminosity-temperature relation of nearby clusters.
Hattori Makoto
Mihara Tatehiro
Mitsuda Kazuhisa
Ota Naomi
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