Non-thermal Radio Emission from Massive Protostars in the SARAO MeerKAT Galactic Plane Survey

Abstract

We present an investigation of the L-band emission from known massive young stellar objects (MYSOs) in the SARAO MeerKAT Galactic Plane Survey to search for non-thermal radio emitters in the sample. A total of 398 massive protostars, identified from the Red MSX Source (RMS) survey, are located within the survey region. Among these, 162 fields that host the protostars are isolated from nearby bright HII regions, allowing for the study of any ionized jets present. Seventy-one of these fields have jets with five-sigma detections or higher, corresponding to a detection rate of 44%. The MeerKAT fluxes of the detections, together with the upper limits of the non-detections and any other fluxes from previous observations, were used to estimate the spectral indices of the jets, and to search for the presence of non-thermal radiation. In cases where a source manifests as single in a given observation but is resolved into multiple components in observations of higher resolutions, the sum of the fluxes of the resolved components was used in estimating the indices. Any e!ects from missing flux in higher-resolution observations were incorporated into the index uncertainties. The spectral indices of the sample show that at least 50% of the jets emit non-thermal radiation. Additionally, the spectral energy distribution (SED) of some of the sources, as well as their radio luminosities exhibit evidence of non-thermal emission, especially in extended sources.

References in corpus (23)

• A Catalog of Extended Green Objects (EGOs) in the GLIMPSE Survey: A new sample of massive young stellar object outflow candidates
• Circumventing the radiation pressure barrier in the formation of massive stars via disk accretion
• Properties of Hi-GAL clumps in the inner Galaxy]{The Hi-GAL compact source catalogue. I. The physical properties of the clumps in the inner Galaxy ($-71.0^{\circ }<\ell <67.0^{\circ }$)
• A Magnetized Jet from a Massive Protostar
• A 24 Micron Point Source Catalog of the Galactic Plane from Spitzer/MIPSGAL
• The RMS Survey: Radio observations of candidate massive YSOs in the southern hemisphere
• A near-IR spectroscopic survey of massive jets towards EGOs
• Weak and Compact Radio Emission in Early High-Mass Star Forming Regions: I. VLA Observations
• Protostellar Outflows and Radiative Feedback from Massive Stars
• A String of Radio Emission Associated with IRAS 16562-3959: A Collimated Jet Emanating from a Luminous Massive YSO
• The Collimated Jet Source in IRAS 16547-4247: Time Variation, Possible Precession, and Upper Limits to the Proper Motions Along the Jet Axis
• Search for ionized jets towards high-mass young stellar objects
• The Highly Collimated Radio Jet of HH 80-81: Structure and Non-Thermal Emission
• GLOSTAR -- Radio Source Catalog I: $28^{\circ }<\text{l}<36^{\circ }$ and $|b|<1^{\circ }$
• Binary system and jet precession and expansion in G35.20-0.74N
• A high-frequency radio continuum study of massive young stellar objects
• An equatorial wind from the massive young stellar object S140 IRS 1
• A Galactic survey of radio jets from massive protostars
• A search for non-thermal radio emission from jets of massive young stellar objects
• Zooming into the Collimation Zone in a Massive Protostellar Jet
• A photoionized accretion disk around a young high-mass star
• A search for radio jets from massive young stellar objects. Association of radio jets with H2O and CH3OH masers
• SOFIA and ALMA Investigate Magnetic Fields and Gas Structures in Massive Star Formation: The Case of the Masquerading Monster in BYF 73

Cited by in corpus (5)

• Dynamic Massive Star Formation: Radio Flux Variability in UCHII Regions
• The stellar population in the SARAO MeerKAT Galactic Plane Survey
• Evidence for protostellar jets as a population of hadronic gamma-ray sources
• Radio emission from flaring stars and brown dwarfs
• High-resolution radio observations of massive protostars in the SARAO MeerKAT Galactic Plane Survey