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| Home > Articles > Published articles > Does processing or formation of water ice mantles affect the capacity of nanosilicates to be the source of anomalous microwave emission? |
| Home > Articles > Published articles > Does processing or formation of water ice mantles affect the capacity of nanosilicates to be the source of anomalous microwave emission? |
(Universitat Autònoma de Barcelona. Departament de Química) (Universitat Autònoma de Barcelona. Departament de Química) (Universitat de Barcelona. Departament de Ciència de Materials i Química Física)| Date: | 2021 |
| Abstract: | Anomalous microwave emission (AME) is detected in many astrophysical environments as a foreground feature typically peaking between 20-30 GHz and extending over a 10-60 GHz range. One of the leading candidates for the source of AME is small spinning dust grains. Such grains should be very small (approx. ≤1 nm diameter) in order for the rotational emission to fall within the observed frequency range. In addition, these nanosized grains should possess a significant dipole moment to account for the observed emissivities. These constraints have been shown to be compatible with spinning bare nanosilicate clusters, assuming that ∼1% of the total Si mass budget is held in these ultrasmall grains. Silicate dust can be hydroxylated by processing in the interstellar medium and is generally known to provide seeds for molecular water ice nucleation in denser regions. Herein, we use quantum chemical calculations to investigate how the dipole moment of Mg-rich pyroxenic (MgSiO3) nanoclusters is affected by both accretion of molecular water and dissociative hydration. Our work thus provides an indication of how the formation of water ice mantles is likely to affect the capacity of nanosilicates to generate AME. |
| Grants: | European Commission 811312 European Commission 865657 Agencia Estatal de Investigación CTQ2017-89132-P Agencia Estatal de Investigación RTI2018-095460-B-I00 Ministerio de Ciencia e Innovación MDM-2017-0767 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1323 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-13 |
| Rights: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.  |
| Language: | Anglès |
| Document: | Article ; recerca ; Versió publicada |
| Subject: | Anomalous microwave emission ; Dust grains ; Nanosilicates ; Water ices ; Interstellar medium ; Grain processing ; Hydroxylation ; Density functional theory |
| Published in: | Frontiers in Astronomy and Space Sciences, Vol. 8 (May 2021) , art. 676548, ISSN 2296-987X |
