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Y. Tsuboi (Penn. State Univ.), K. Koyama, K. Hamaguchi (Kyoto Univ.), K. Tatematsu, Y. Sekimoto (NAO Japan), J. Bally, B. Reipurth (Univ. of Colorado)
We have observed a 17' \times 17' field in the Orion Molecular Cloud 2 and 3 region with the Chandra X-ray Observatory. A 90 ksec exposure of ACIS in 0.5--8 keV band revealed about 300 sources, in which 90 % are new detection in X-ray wavelength. From 7 of the 36 Class 0 candidates, we detected highly absorbed X-rays (L\rm x ~1030 erg s-1, N\rm H ~1023 H cm-2). Then these results would be the first evidence that X-rays are emitted from very early phase of stellar evolution, possibly in the age of less than 105 year.