The Intricate Structure of HH 508, the Brightest Microjet in the Orion Nebula

Abstract

We present Magellan adaptive optics H$\alpha$ imaging of HH 508, which has the highest surface brightness among protostellar jets in the Orion Nebula. We find that HH 508 actually has a shorter component to the west, and a longer and knotty component to the east. The east component has a kink at 0.3" from the jet-driving star ${\theta }^1$ Ori B2, so it may have been deflected by the wind/radiation from the nearby ${\theta }^1$ Ori B1B5. The origin of both components is unclear, but if each of them is a separate jet, then ${\theta }^1$ Ori B2 may be a tight binary. Alternatively, HH 508 may be a slow-moving outflow, and each component represents an illuminated cavity wall. The ionization front surrounding ${\theta }^1$ Ori B2B3 does not directly face ${\theta }^1$ Ori B1B5, suggesting that the EUV radiation from ${\theta }^1$ Ori C plays a dominant role in affecting the morphology of proplyds even in the vicinity of ${\theta }^1$ Ori B1B5. Finally, we report an H$\alpha$ blob that might be ejected by the binary proplyd LV 1.

arXiv comment4 pages. Published in ApJ

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