A High-Resolution Very Large Array Observation of a Protostar in OMC-3: Shock-induced X-ray Emission by a Protostellar Jet

Abstract

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.

5 pages, 4 postscript figures, accepted for publication in PASJ

References in corpus (9)

• Ten Million Degree Gas in M 17 and the Rosette Nebula: X-ray Flows in Galactic H II Regions
• The discovery of X-ray emission from the protostellar jet L1551 IRS5 (HH 154)
• High resolution imaging of CO outflows in OMC-2 and OMC-3
• The X-ray Luminosities of HH Objects
• Discovery of X rays from Class 0 protostar candidates in OMC-3
• X-ray Properties of Young Stellar Objects in OMC-2 and OMC-3 from the Chandra X-ray Observatory
• The stellar content of OMC 2/3
• Deep Near-Infrared Observations and Identifications of Chandra Sources in the Orion Molecular Cloud 2 and 3
• Deep Near Infrared Observations of the X-ray Emitting Class 0 Protostar Candidates in the Orion Molecular Cloud-3

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• X-rays from jet-driving protostars and T Tauri stars
• The onset of X-ray emission in young stellar objects: a Chandra observation of the Serpens star-forming region
• N2H+ and HC3N Observations of the Orion A Cloud
• X-ray Emission from Orion Nebula Cluster Stars with Circumstellar Disks and Jets
• Radio and X-ray variability of Young Stellar Objects in the Coronet Cluster
• Discovery of Extremely Embedded X-ray Sources in the R Coronae Australis Star Forming Core
• X-rays from protostellar jets: emission from continuous flows
• Centimeter Imaging of the R Coronae Australis Region
• Generation of radiative knots in a randomly pulsed protostellar jet II. X-ray emission
• Particle acceleration in the Herbig-Haro objects HH 80 and HH 81
• Chemical Variation in Molecular Cloud Cores in the Orion A Cloud. II
• Searching for coronal radio emission from protostars using Very-Long-Baseline Interferometry
• Formation of X-ray emitting stationary shocks in magnetized protostellar jets
• Evidence of non-thermal X-ray emission from HH 80
• Structure of X-ray emitting jets close to the launching site: from embedded to disk-bearing sources
• Warm gas in protostellar outflows. II. EHV jet and outflows from OMC-2/3
• X-ray emission from stellar jets by collision against high-density molecular clouds: an application to HH 248
• Pre main sequence: Accretion & Outflows
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• Accretion and Outflow-Related X-Rays in T Tauri Stars