文章基本信息

标题：Protostellar Outflows at the EarliesT Stages (POETS)
其他标题：II. A possible radio synchrotron jet associated with the EGO G035.02+0.35
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作者：A. Sanna ; L. Moscadelli ; C. Goddi 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2019
卷号：623
DOI：10.1051/0004-6361/201834551
语种：English
出版社：EDP Sciences
摘要：Centimeter continuum observations of protostellar jets have revealed knots of shocked gas where the flux density decreases with frequency. This spectrum is characteristic of nonthermal synchrotron radiation and implies both magnetic fields and relativistic electrons in protostellar jets. Here, we report on one of the few detections of a nonthermal jet driven by a young massive star in the star-forming region G035.02+0.35. We made use of the NSF’s Karl G. Jansky Very Large Array (VLA) to observe this region atC,Ku, andKbands with the A- and B-array configurations, and obtained sensitive radio continuum maps down to an rms of 10μJy beam−1. These observations allow for a detailed spectral index analysis of the radio continuum emission in the region, which we interpret as a protostellar jet with a number of knots aligned with extended 4.5μm emission. Two knots clearly emit nonthermal radiation and are found at similar distances, of approximately 10 000 au, at each side of the central young star, from which they expand at velocities of several hundred km s−1. We estimate both the mechanical force and the magnetic field associated with the radio jet, and infer a lower limit of 0.4 × 10−4 M⊙yr−1km s−1and values in the range 0.7–1.3 mG.
关键词：enstars: formationradio continuum: ISMH II regionsISM: jets and outflowstechniques: high angular resolutionstars: individual: G035.02+0.35