On the Limitations of the Anomalous Microwave Emission Emissivity
arXiv:1212.3269 · doi:10.1155/2012/124931
Abstract
Many studies of anomalous microwave emission (AME) have computed an AME emissivity to compare the strength of the AME detected in different regions. Such a value is usually defined as the ratio between the intensity of the AME at 1 cm and the thermal dust emission at 100 μm. However, as studies of Galactic dust emission have shown, the intensity of the thermal dust emission at 100 μm is strongly dependent on the dust temperature, which has severe implications for the AME emissivity defined in this way. In this work, we illustrate and quantify this effect and find that the AME emissivity decreases by a factor of 11.1 between dust temperatures of 20 and 30 K. We, therefore, conclude that computing the AME emissivity relative to the 100 μm emission does not allow for accurate comparisons between the AME observed in different environments. With this in mind, we investigate the use of other tracers of the dust emission with which to compute the AME emissivity and we ultimately conclude that, despite the difficulty in deriving its value, the column density of the dust would be the most suitable quantity with which to compute the AME emissivity.
arXiv commentAccepted for publication in the Advances in Astronomy Special Issue: Anomalous Microwave Emission: Theory, Modeling, and Observations. Published version available at http://www.hindawi.com/journals/aa/2012/124931/
References in corpus (37)
- Infrared Emission from Interstellar Dust. IV. The Silicate-Graphite-PAH Model in the Post-Spitzer Era
- Dust Masses, PAH Abundances, and Starlight Intensities in the SINGS Galaxy Sample
- Electric Dipole Radiation from Spinning Dust Grains
- Planck Early Results: All sky temperature and dust optical depth from Planck and IRAS: Constraints on the "dark gas" in our galaxy
- An Anomalous Component of Galactic Emission
- Microwave Emission at High Galactic Latitudes
- The "True" Column Density Distribution in Star-Forming Molecular Clouds
- Inverse temperature dependence of the dust submillimeter spectral index
- Planck early results. XX. New light on anomalous microwave emission from spinning dust grains
- A refined model for spinning dust radiation
- A determination of the Spectra of Galactic components observed by WMAP
- Planck Early Results: Origin of the submm excess dust emission in the Magellanic Clouds
- Galactic microwave emission at degree angular scales
- Detection of anomalous microwave emission in the Perseus molecular cloud with the COSMOSOMAS experiment
- Improving the model of emission from spinning dust: effects of grain wobbling and transient spin-up
- Spinning dust emission: the effect of rotation around a non-principal axis
- Morphological analysis of the cm-wave continuum in the dark cloud LDN1622
- Tentative Detection of Electric Dipole Emission from Rapidly Rotating Dust Grains
- The Detection of Anomalous Dust Emission in the Nearby Galaxy NGC 6946
- The long-wavelength emission of interstellar PAHs: characterizing the spinning dust contribution
- Centimeter-wave continuum radiation from the rho Ophiuchi molecular cloud
- Evidence for dust evolution within the Taurus Complex from Spitzer images
- Spinning Dust Emission: Effects of irregular grain shape, transient heating and comparison with WMAP results
- Reappraising foreground contamination in the COBE-DMR data
- VSA Observations of the Anomalous Microwave Emission in the Perseus Region
- A multi-wavelength investigation of RCW175: an HII region harboring spinning dust emission
- CBI limits on 31 GHz excess emission in southern HII regions
- Spitzer characterisation of dust in an anomalous emission region: the Perseus cloud
- Microwave observations of spinning dust emission in NGC6946
- Dust-correlated cm-wavelength continuum emission on translucent clouds ζ Oph and LDN 1780
- Inverse temperature dependence of the dust submillimeter spectral index
- Foreground Analysis Using Cross-Correlations of External Templates on the 7-year WMAP data
- Dust-correlated centimetre-wave radiation from the M 78 reflection nebula
- IR-correlated 31 GHz radio emission from Orion East
- An excess of emission in the dark cloud LDN 1111 with the Arcminute Microkelvin Imager
- Detection of Anomalous Microwave Emission in the Pleiades Reflection Nebula with WMAP and the COSMOSOMAS Experiment
- A 33 GHz VSA survey of the Galactic plane from 27 to 46 degrees
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- The State-of-Play of Anomalous Microwave Emission (AME) Research
- Planck 2015 results. XXV. Diffuse low-frequency Galactic foregrounds
- A Case Against Spinning PAHs as the Source of the Anomalous Microwave Emission
- Planck intermediate results. XXV. The Andromeda Galaxy as seen by Planck
- Characterizing Extragalactic Anomalous Microwave Emission in NGC 6946 with CARMA
- 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
- Planck Observations of M33
- Detection and Removal of B-mode Dust Foregrounds with Signatures of Statistical Anisotropy
- Searching for Anomalous Microwave Emission in nearby galaxies. K-band observations with the Sardinia Radio Telescope
- QUIJOTE Scientific Results -- XVII. Studying the Anomalous Microwave Emission in the Andromeda Galaxy with QUIJOTE-MFI
- Far-infrared to centimeter emission of very nearby galaxies with archival data
- The mm-to-cm SED of spiral galaxies. Synergies between NIKA2 and SRT instruments