Anomalous Microwave Emission in HII regions: is it really anomalous? The case of RCW 49

Abstract

The detection of an excess of emission at microwave frequencies with respect to the predicted free-free emission has been reported for several Galactic HII regions. Here, we investigate the case of RCW 49, for which the Cosmic Background Imager tentatively (~ 3 sigma) detected Anomalous Microwave Emission at 31 GHz on angular scales of 7'. Using the Australia Telescope Compact Array, we carried out a multi-frequency (5 GHz, 19 GHz and 34 GHz) continuum study of the region, complemented by observations of the H109$\alpha$ radio recombination line. The analysis shows that: 1) the spatial correlation between the microwave and IR emission persists on angular scales from 3.4' to 0.4", although the degree of the correlation slightly decreases at higher frequencies and on smaller angular scales, 2) the spectral indices between 1.4 and 5 GHz are globally in agreement with optically thin free-free emission, however, ~ 30% of these are positive and much greater than -0.1, consistently with a stellar wind scenario, 3) no major evidence for inverted free-free radiation is found, indicating that this is likely not the cause of the Anomalous Emission in RCW 49. Although our results cannot rule out the spinning dust hypothesis to explain the tentative detection of Anomalous Microwave emission in RCW 49, they emphasize the complexity of astronomical sources very well known and studied such as HII regions, and suggest that, at least in these objects, the reported excess of emission might be ascribed to alternative mechanisms such as stellar winds and shocks.

Accepted for publication in ApJ. 11 pages, 8 figures

References in corpus (10)

• Multi-Scale CLEAN deconvolution of radio synthesis images
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• A refined model for spinning dust radiation
• Planck intermediate results. XIV. Dust emission at millimetre wavelengths in the Galactic plane
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• AMI limits on 15 GHz excess emission in northern HII regions
• An upper limit on anomalous dust emission at 31 GHz in the diffuse cloud [LPH96]201.663+1.643
• Constraints on spinning dust towards Galactic targets with the VSA: a tentative detection of excess microwave emission towards 3C396
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Cited by in corpus (7)

• The State-of-Play of Anomalous Microwave Emission (AME) Research
• SOFIA FEEDBACK survey: exploring the dynamics of the stellar wind driven shell of RCW 49
• Strong evidence of Anomalous Microwave Emission from the flux density spectrum of M31
• A high precision technique to correct for residual atmospheric dispersion in high-contrast imaging systems
• The C-Band All-Sky Survey (C-BASS): New Constraints on the Integrated Radio Spectrum of M 31
• SCORPIO-II: Spectral indices of weak Galactic radio sources
• Constraining the Anomalous Microwave Emission Mechanism in the S140 Star Forming Region with Spectroscopic Observations Between 4 and 8 GHz at the Green Bank Telescope