Mapping the radio emission from massive young stellar objects

Astronomy and Astrophysics – Astronomy

Scientific paper

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Accretion Disks, Infrared Astronomy, Radiation Pressure, Radio Stars, Star Formation, Stellar Winds, Angular Momentum, Computer Programs, Image Processing, Very Large Array (Vla), Very Long Base Interferometry

Scientific paper

We present the first maps of the radio emission from hitherto spatially unresolved massive young stellar objects. Observations of three targets were made with the recently upgraded MERLIN array at 5 GHz with a nominal resolution of 0.05 sec. Our map of the exciting source of the bipolar H II region S106 reveals a source of 0.224 sec x 0.060 sec elongated perpendicular to the H II region. This could be due to interaction of the stellar wind with a remnant disk, enhancement of the wind in the equatorial plane due to rapid rotation of the young star, or a disk-fed radiation-driven wind. By comparison, the emission from LkH-alpha 101 is symmetric, although rather clumpy. No emission was detected from BN to a level of 0.3 mJy/beam.

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