Weak and Compact Radio Emission in Early High-mass Star-forming Regions. II. The Nature of the Radio Sources
Journal
Date Issued
2019
Author(s)
Rosero, V.
•
Hofner, P.
•
Kurtz, S.
•
•
Carrasco-González, C.
•
Araya, E. D.
•
Rodríguez, L. F.
•
Menten, K. M.
•
Wyrowski, F.
•
Loinard, L.
•
Ellingsen, S. P.
•
Abstract
In this study we analyze 70 radio continuum sources that are associated with dust clumps and which are considered to be candidates for the earliest stages of high-mass star formation. The detection of these sources was reported by Rosero et al., who found most of them to show weak (< 1 mJy) and compact (< 0.″6) radio emission. Herein, we used the observed parameters of these sources to investigate the origin of the radio continuum emission. We found that at least ∼30% of these radio detections are most likely to be ionized jets associated with high-mass protostars. However, for the most compact sources, we cannot discard the scenario that they represent pressure-confined H II regions. This result is highly relevant for recent theoretical models that are based on core accretion, which predict the first stages of ionization from high-mass stars to be in the form of jets. Additionally, we found that properties such as the radio luminosity as a function of the bolometric luminosity of ionized jets from low and high-mass stars are extremely well-correlated. Our data improve upon previous studies by providing further evidence of a common origin for jets independently of luminosity.
Volume
880
Issue
2
Start page
99
Issn Identifier
0004-637X
Ads BibCode
2019ApJ...880...99R
Rights
open.access
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