AMI Observations of the Anomalous Microwave Emission in the Perseus Molecular Cloud

Abstract

We present observations of the known anomalous microwave emission region, G159.6-18.5, in the Perseus molecular cloud at 16 GHz performed with the Arcminute Microkelvin Imager Small Array. These are the highest angular resolution observations of G159.6-18.5 at microwave wavelengths. By combining these microwave data with infrared observations between 5.8 and 160 μm from the Spitzer Space Telescope, we investigate the existence of a microwave - infrared correlation on angular scales of ~2 arcmin. We find that the overall correlation appears to increase towards shorter infrared wavelengths, which is consistent with the microwave emission being produced by electric dipole radiation from small, spinning dust grains. We also find that the microwave - infrared correlation peaks at 24 μm (6.7σ), suggesting that the microwave emission is originating from a population of stochastically heated small interstellar dust grains rather than polycyclic aromatic hydrocarbons.

Accepted for publication in ApJ

References in corpus (4)

• Separation of anomalous and synchrotron emissions using WMAP polarization data
• Centimeter-wave continuum radiation from the rho Ophiuchi molecular cloud
• A multi-wavelength investigation of RCW175: an HII region harboring spinning dust emission
• CBI limits on 31 GHz excess emission in southern HII regions

Cited by in corpus (16)

• The State-of-Play of Anomalous Microwave Emission (AME) Research
• Measurements of the Intensity and Polarization of the Anomalous Microwave Emission in the Perseus molecular complex with QUIJOTE
• The C-Band All-Sky Survey (C-BASS): Design and capabilities
• Detection of Spectral Variations of Anomalous Microwave Emission with QUIJOTE and C-BASS
• New radio observations of anomalous microwave emission in the HII region RCW175
• Using cm Observations to Constrain the Abundance of Very Small Dust Grains in Galactic Cold Cores
• The C-Band All-Sky Survey (C-BASS): Template Fitting of Diffuse Galactic Microwave Emission in the Northern Sky
• The C-Band All-Sky Survey (C-BASS): Constraining diffuse Galactic radio emission in the North Celestial Pole region
• Search for PAHs in the Perseus molecular cloud with the Green Bank Telescope
• Planck Observations of M33
• Resolved observations at 31 GHz of spinning dust emissivity variations in $\rho$ Oph
• QUIJOTE scientific results -- X. Spatial variations of Anomalous Microwave Emission along the Galactic plane
• CARMA Observations of Galactic Cold Cores: Searching for Spinning Dust Emission
• Observations of Galactic star-forming regions with the Cosmic Background Imager at 31 GHz
• Constraints on free-free emission from Anomalous Microwave Emission Sources in the Perseus Molecular Cloud
• AMI-CL J0300+2613: a Galactic anomalous-microwave-emission ring masquerading as a galaxy cluster