An Ionized Outflow in Orion-KL Source I?

Wright, Melvyn, Hirota, Tomoya, Forbrich, Jan, Plambeck, Richard, Bally, John, Goddi, Ciriaco, Ginsburg, Adam and McGuire, Brett (2023) An Ionized Outflow in Orion-KL Source I? The Astrophysical Journal, 945 (1): 14. pp. 1-11. ISSN 0004-637X

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We present images at 6 and 14 GHz of Source I (SrcI) in the Kleinmann–Low Nebula in Orion. At higher frequencies, from 43 to 340 GHz, images of this source are dominated by thermal emission from dust in a 100 au diameter circumstellar disk, but at 6 and 14 GHz the emission is elongated along the minor axis of the disk, aligned with the SiO bipolar outflow from the central object. Gaussian fits to the 6, 14, 43, and 99 GHz images find a component along the disk minor axis whose flux and length vary with frequency consistent with free–free emission from an ionized outflow. The data favor a broad outflow from a disk wind, rather than a narrow ionized jet. SrcI was undetected in higher-resolution 5 GHz e-MERLIN observations obtained in 2021. The 5–6 GHz structure of SrcI may be resolved out by the high sidelobe structure of the e-MERLIN synthesized beam, or be time variable.

Item Type	Article
Additional information	© 2023. The Author(s). Published by the American Astronomical Society. This is an open access article distributed under the Creative Commons Attribution License, to view a copy of the license, see: https://creativecommons.org/licenses/by/4.0/
Keywords	320, interstellar matter and the local universe, astronomy and astrophysics, space and planetary science
Date Deposited	15 May 2025 15:05
Last Modified	31 May 2025 00:37