Detection of high-temperature plasma in the Orion Nebula - an intense 6.7-keV iron X-ray emission line in its spectrum

Agrawal Prahlad, C. ; Katsuji, Koyama ; Masaru, Matsuoka ; Yasuo, Tanaka (1986) Detection of high-temperature plasma in the Orion Nebula - an intense 6.7-keV iron X-ray emission line in its spectrum Astronomical Society of Japan, Publications, 38 (5). pp. 723-729. ISSN 0004-6264

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Abstract

The X-ray spectrum of the Orion Nebula derived from observations made with the gas scintillation proportional counters onboard the Tenma satellite is described. The continuum spectrum is fitted well with a thermal bremsstrahlung model with kT = 3.7 ± 0.3 keV. An X-ray emission feature at an energy of 6.69 ± 0.06 keV having an equivalent width of 640 ±120 eV, which is attributed to transitions of Fe XXV ions, is clearly detected in the spectrum. It is suggested that the X-ray emission comes from an optically thin hot plasma at a temperature of 4 x 10 7 K. Possible origins of the high-temperature thermal component are briefly discussed.

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Deposited On:14 Mar 2012 14:28
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