Astronomy & Astrophysics | VOL. 477

A 1.3 cm wavelength radio flare from a deeply embedded source in the Orion BN/KL region

Publication Date Nov 20, 2007


Aims. Our aim was to measure and characterize the short-wavelength radio emission from young stellar objects (YSOs) in the Orion Nebula Cluster and the BN/KL star-forming region. Methods. We used the NRAO Very Large Array at a wavelength of A = 1.3 cm and we studied archival X-ray, infrared, and radio data. Results. During our observation, a strong outburst (flux increasing > 10 fold) occurred in one of the 16 sources detected at A = 1.3 cm, while the others remained (nearly) constant. This source does not have an infrared counterpart, but has subsequently been observed to flare in X-rays. Curiously, a very weak variable double radio source was found at other epochs near this position, one of whose components is coincident with it. A very high extinction derived from modeling the X-ray emission and the absence of an infrared counterpart both suggest that this source is very deeply embedded.


Orion Nebula Young Stellar Objects Strong Outburst Radio Data Large Array Star-forming Region Short-wavelength Emission Double Source Weak Source Variable Source

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