Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48..719y&link_type=abstract
Publications of the Astronomical Society of Japan, v.48, p.719-737.
Astronomy and Astrophysics
Astronomy
47
Nebulae: Individual (Orion Nebula), Stars: Pre-Main-Sequence, Stars: X-Rays, X-Rays: Interstellar, X-Rays: Spectra
Scientific paper
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.
Koyama Katsuji
Okada Kyoko
Sakano Masaaki
Yamauchi Shigeo
No associations
LandOfFree
Broad-Band X-Ray Observations of the Orion Region with ASCA does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Broad-Band X-Ray Observations of the Orion Region with ASCA, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Broad-Band X-Ray Observations of the Orion Region with ASCA will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1139747