Year: 2023
Type: article
Abstract: 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.
Source: The Astrophysical Journal
Institutions: University of California, Berkeley, National Astronomical Observatory of Japan, University of Hertfordshire, University of Colorado Boulder, University of Cagliari, Universidade de São Paulo, Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari, Osservatorio Astronomico di Cagliari, University of Florida, National Radio Astronomy Observatory, Massachusetts Institute of Technology
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,499
Funders: National Science Foundation, National Radio Astronomy Observatory, Ministry of Education, Culture, Sports, Science and Technology, Fundação de Amparo à Pesquisa do Estado de São Paulo, Korea Astronomy and Space Science Institute, National Astronomical Observatory of Japan, Science and Technology Facilities Council, Japan Society for the Promotion of Science, National Institutes of Natural Sciences
Awards: Chemical Composition of Disk Forming Regions of Solar-type Protostars and its Evolution to Planetary Systems, G2107196950, International joint research for maser variability and mass accretion processes in high-mass protostars, G2909854298, G3169766723, G4434283826, G627057124, G640738599, G7786853710, G8237147847, G8616911079
OpenAlex ID: W4322734745