Modeling the Anomalous Microwave Emission with Spinning Nanoparticles: No PAHs Required

Abstract

In light of recent observational results indicating an apparent lack of correlation between the Anomalous Microwave Emission (AME) and mid-infrared emission from polycyclic aromatic hydrocarbons (PAHs), we assess whether rotational emission from spinning silicate and/or iron nanoparticles could account for the observed AME without violating observational constraints on interstellar abundances, ultraviolet extinction, and infrared emission. By modifying the SpDust code to compute the rotational emission from these grains, we find that nanosilicate grains could account for the entirety of the observed AME, whereas iron grains could be responsible for only a fraction, even for extreme assumptions on the amount of interstellar iron concentrated in ultrasmall iron nanoparticles. Given the added complexity of contributions from multiple grain populations to the total spinning dust emission, as well as existing uncertainties due to the poorly-constrained grain size, charge, and dipole moment distributions, we discuss generic, carrier-independent predictions of spinning dust theory and observational tests that could help identify the AME carrier(s).

Submitted to ApJ, comments welcome

References in corpus (13)

• Infrared Emission from Interstellar Dust. IV. The Silicate-Graphite-PAH Model in the Post-Spitzer Era
• A Unified Representation of Gas-Phase Element Depletions in the Interstellar Medium
• An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR-Through-UV Curve Morphology
• alpha-, r-, and s-process element trends in the Galactic thin and thick disks
• Extended Anomalous Foreground Emission in the WMAP 3-Year Data
• Separation of anomalous and synchrotron emissions using WMAP polarization data
• A refined model for spinning dust radiation
• The Evolution of Magnetism in Iron from the Atom to the Bulk
• The Composition of Interstellar Grains Toward Zeta Ophiuchi: Constraining the Elemental Budget Near the Diffuse-Dense Cloud Transition
• Constraining Spinning Dust Parameters with the WMAP Five-Year Data
• Characterizing Extragalactic Anomalous Microwave Emission in NGC 6946 with CARMA
• Thermodynamics and Charging of Interstellar Iron Nanoparticles
• New radio observations of anomalous microwave emission in the HII region RCW175

Cited by in corpus (37)

• The Astrodust+PAH Model: A Unified Description of the Extinction, Emission, and Polarization from Dust in the Diffuse Interstellar Medium
• Strong evidence of Anomalous Microwave Emission from the flux density spectrum of M31
• The Simons Observatory: Galactic Science Goals and Forecasts
• Polycyclic Aromatic Hydrocarbons, the Anomalous Microwave Emission, and Their Connection to the Cold Neutral Medium
• Interstellar Silicon Depletion and the Ultraviolet Extinction
• Frequency dependence of the thermal dust $E/B$ ratio and $EB$ correlation: insights from the spin-moment expansion
• Multi-Clustering Needlet-ILC for CMB B-modes component separation
• Interstellar Extinction and Elemental Abundances
• Investigation of the Origin of the Anomalous Microwave Emission in Lambda Orionis
• Molecular hydrogen and its proxies HCO${}^{+}$ and CO in the diffuse interstellar medium
• COMAP Early Science: VI. A First Look at the COMAP Galactic Plane Survey
• Polarized Synchrotron Foreground Assessment for CMB Experiments
• Interstellar Extinction and Elemental Abundances: Individual Sight Lines
• QUIJOTE Scientific results. III. Microwave spectrum of intensity and polarization in the Taurus molecular cloud Complex and L1527
• Spinning nano-carbon grains: Viable origin for anomalous microwave emission
• QUIJOTE scientific results -- X. Spatial variations of Anomalous Microwave Emission along the Galactic plane
• ALMA hints at the existence of an unseen reservoir of diffuse molecular gas in the Galactic bulge
• QUIJOTE Scientific Results -- VII. Galactic AME sources in the QUIJOTE-MFI Northern Hemisphere Wide-Survey
• QUIJOTE Scientific Results -- XVII. Studying the Anomalous Microwave Emission in the Andromeda Galaxy with QUIJOTE-MFI
• Reconciling X-ray and 21cm HI absorption gas column densities toward obscured AGN
• Ultraviolet Spectropolarimetry with Polstar: Interstellar Medium Science
• High-Resolution X-Ray Spectroscopy of Interstellar Iron Toward Cygnus X-1 and GX 339-4
• Where's the Dust?: The Deepening Anomaly of Microwave Emission in NGC 4725 B
• CO emission and CO hotspots in diffuse molecular gas
• Thermal emission from the amorphous dust: An alternative possibility of the origin of the anomalous microwave emission
• Dust Grain Growth at High Redshift: Starburst-driven CMB-Dark Supershells
• Identifying frequency decorrelated dust residuals in B-mode maps by exploiting the spectral capability of bolometric interferometry
• QUIJOTE scientific results -- XVIII. New constraints on the polarization of the Anomalous Microwave Emission in bright Galactic regions: $\rho$\,Ophiuchi, Perseus and W43
• Tracing PAH Emission in $\lambda$-Orionis Using COBE/DIRBE Data
• The Role of Radio Observations in Studies of Infrared-Bright Galaxies: Prospects for a next-generation Very Large Array
• Silicon and iron dust in gamma-ray burst host galaxy absorbers
• Spinning Nanoparticles Impacted by C-shock: Implications for Radio-millimeter Emission from Star-forming Regions
• SpyDust: an improved and extended implementation for modeling spinning dust radiation
• The mm-to-cm SED of spiral galaxies. Synergies between NIKA2 and SRT instruments
• A new approach of estimating the Galactic thermal dust and synchrotron polarized emission template in the microwave bands
• Modeling Long-Wavelength Amorphous Dust Emission Based on the Physically Motivated Soft-Potential Model
• Do We Have Sufficient Knowledge of the Galactic Foreground Emission in Cosmic Microwave Background Science?