Tentative Detection of Electric Dipole Emission from Rapidly Rotating Dust Grains

Abstract

We present the first tentative detection of spinning dust emission from specific astronomical sources. All other detections in the current literature are statistical. The Green Bank 140 foot telescope was used to observe 10 dust clouds at 5, 8, and 10 GHz. In some cases, the observed emission was consistent with the negative spectral slope expected for free-free emission (thermal bremsstrahlung), but in two cases it was not. One HII region yields a rising spectrum, inconsistent with free-free or synchrotron emission at the 10 sigma level. One dark cloud (L 1622) has a similar spectrum with lower significance. Both spectra are consistent with electric dipole emission from rapidly rotating dust grains ("spinning dust"), as predicted by Draine & Lazarian.

18 pages, 5 figures, accepted by ApJ

References in corpus (2)

• A Robotic Wide-Angle H-Alpha Survey of the Southern Sky
• First Intrinsic Anisotropy Observations with the Cosmic Background Imager

Cited by in corpus (66)

• Interstellar Dust Grains
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Foreground Emission
• Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Temperature Analysis
• The Microwave Anisotropy Probe (MAP) Mission
• A Full-Sky H-alpha Template for Microwave Foreground Prediction
• Microwave ISM Emission Observed by WMAP
• Towards a free-free template for CMB foregrounds
• High sensitivity measurements of the CMB power spectrum with the extended Very Small Array
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Galactic Foreground Emission
• Planck early results. XX. New light on anomalous microwave emission from spinning dust grains
• A determination of the Spectra of Galactic components observed by WMAP
• Detection of anomalous microwave emission in the Perseus molecular cloud with the COSMOSOMAS experiment
• The State-of-Play of Anomalous Microwave Emission (AME) Research
• Morphological analysis of the cm-wave continuum in the dark cloud LDN1622
• Microwave ISM Emission in the Green Bank Galactic Plane Survey: Evidence for Spinning Dust
• Centimeter-wave continuum radiation from the rho Ophiuchi molecular cloud
• The Quest for Microwave Foreground X
• Measurements of the Intensity and Polarization of the Anomalous Microwave Emission in the Perseus molecular complex with QUIJOTE
• Modeling the Dust Properties of z ~ 6 Quasars with ART^2 -- All-wavelength Radiative Transfer with Adaptive Refinement Tree
• The large-scale anomalous microwave emission revisited by WMAP
• Density probability distribution functions of diffuse gas in the Milky Way
• Reappraising foreground contamination in the COBE-DMR data
• VSA Observations of the Anomalous Microwave Emission in the Perseus Region
• CMB power spectrum estimation and map reconstruction with the Expectation - Maximization algorithm
• New constraints on the Polarization of Anomalous Microwave Emission in nearby molecular clouds
• CBI limits on 31 GHz excess emission in southern HII regions
• Polarization Observations of the Anomalous Microwave Emission in the Perseus Molecular Complex with the Cosmosomas Experiment
• Spitzer characterisation of dust in an anomalous emission region: the Perseus cloud
• 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
• Anomalous radio emission from dust in the Helix
• Identification of Spinning Dust in Halpha-Correlated Microwave Emission
• Galactic foregrounds: Spatial fluctuations and a procedure of removal
• Microwave Emission from Aligned Dust
• A Limit on the Polarized Anomalous Microwave Emission of Lynds 1622
• Dust-correlated centimetre-wave radiation from the M 78 reflection nebula
• IR-correlated 31 GHz radio emission from Orion East
• Planck intermediate results. XII: Diffuse Galactic components in the Gould Belt System
• An excess of emission in the dark cloud LDN 1111 with the Arcminute Microkelvin Imager
• Foreground separation using a flexible maximum-entropy algorithm: an application to COBE data
• Galactic Foregrounds in OVRO and UCSB South Pole 1994 Cosmic Microwave Background Anisotropy Data
• Derivation of an Analytical Approximation of the Spectrum of Spinning Dust Emission
• Detection of Anomalous Microwave Emission in the Pleiades Reflection Nebula with WMAP and the COSMOSOMAS Experiment
• Investigation of the Origin of the Anomalous Microwave Emission in Lambda Orionis
• Galactic Foreground Constraints from the Python V Cosmic Microwave Background Anisotropy Data
• High Galactic Latitude Interstellar Neutral Hydrogen Structure and Associated (WMAP) High Frequency Continuum Emission
• On the Limitations of the Anomalous Microwave Emission Emissivity
• The C-Band All-Sky Survey (C-BASS): Constraining diffuse Galactic radio emission in the North Celestial Pole region
• A 33 GHz VSA survey of the Galactic plane from 27 to 46 degrees
• Resolved spectral variations of the centimetre-wavelength continuum from the rho Oph W photo-dissociation-region
• Evidence for Inverted Spectrum 20 GHz Emission in the Galactic Plane
• Observations of Free-Free and Anomalous Microwave Emission from LDN 1622 with the 100 m Green Bank Telescope
• Anomalous Microwave Emission in HII regions: is it really anomalous? The case of RCW 49
• Modelling the spinning dust emission from LDN 1780
• QUIJOTE scientific results -- V. The microwave intensity and polarisation spectra of the Galactic regions W49, W51 and IC443
• Spinning Dust Emission from Wobbling Grains: Important Physical Effects and Implications
• Observations of Galactic star-forming regions with the Cosmic Background Imager at 31 GHz
• Evidence for anomalous dust-correlated emission at 8 GHz
• Large Radio Telescopes for Anomalous Microwave Emission Observations
• Observations of Anomalous Microwave Emission from HII regions
• Foreground removal from WMAP 7yr polarization maps using an MLP neural network
• Experiences with Airborne and Ground-Based Polarimetry
• A New Upper Limit on the Polarization of the Cosmic Microwave Background Radiation
• Why don't clumps of cirrus dust gravitationally collapse?