Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-01-07
Astronomy and Astrophysics
Astrophysics
5 pages, 4 postscript figures, accepted for publication in PASJ
Scientific paper
Using the Very Large Array (VLA) in the A-configuration, we have obtained a high-resolution 3.6 cm map of a hard X-ray source detected by the Chandra X-ray Observatory in a protostellar clump in Orion molecular cloud 3. Two radio continuum sources were detected in the vicinity of the X-ray source, both of which have NIR counterparts. We conclude that these VLA sources are free-free emission produced by shocks in protostellar jets from the NIR class I protostars. Using the centimeter data, we determined the power and orientation of the protostellar jets. The center position of the X-ray emission was found to be ~1--2" offset from the exciting sources of the jets, and the displacement is in the direction of the jets and molecular outflows. We discuss the nature of the X-ray emission as the shock-excited plasma at the shock front where the jet propagates through interstellar medium at a speed of ~1000 km/s.
Chandler Claire J.
Kobayashi Nami
Koyama Katsuji
Saito Masao
Tsuboi Yohko
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