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Title:
Broad-Band X-Ray Observations of the Orion Region with ASCA
Authors:
Yamauchi, Shigeo; Koyama, Katsuji; Sakano, Masaaki; Okada, Kyoko
Affiliation:
AA(Faculty of Humanities and Social Sciences, Iwate University, 3-18-34 Ueda, Morioka, Iwate 020), AB(Faculty of Humanities and Social Sciences, Iwate University, 3-18-34 Ueda, Morioka, Iwate 020), AC(Department of Physics, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-01), AD(The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229 })
Publication:
Publ. of the Astronomical Society of Japan, v.48, p.719-737. (PASJ Homepage)
Publication Date:
10/1996
Origin:
PASJ
PASJ Keywords:
NEBULAE: INDIVIDUAL (ORION NEBULA), STARS: PRE-MAIN-SEQUENCE, STARS: X-RAYS, X-RAYS: INTERSTELLAR, X-RAYS: SPECTRA
Bibliographic Code:
1996PASJ...48..719Y

Abstract

Broad-band X-ray images and spectra of the Orion Nebula region were obtained with the X-ray satellite ASCA. Fifty two point-like sources were resolved, including the Orion Trapezium. A large fraction of the optical counterparts of the ASCA sources were classified as G--M type stars. Spectral model fits and count ratios (flux ratio between soft and broad bands) revealed that most of the point sources exhibit a high-temperature plasma of { ~ }2--5 keV. Model fits of the X-ray spectra from extended regions around the Orion Nebula (M42), the reflection nebula NGC 1977, and the sky between these nebulae required at least two-temperature components of typically 0.7--1 keV and 3--5 keV. >From selected high-flux sources, we also found that the model of a 2-temperature thin thermal plasma is more likely than that of a single-temperature. X-ray light curves from these sources were time variable, but showed no large flares. We thus suggest that the hard X-rays are generated even in relatively quiescent states.

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