@article{10902/34996,
year = {2021},
month = {5},
url = {https://hdl.handle.net/10902/34996},
abstract = {Anomalous Microwave Emission (AME) is a significant component of Galactic diffuse emission in the frequency range 10- 60 GHz and a new window into the properties of sub-nanometre-sized grains in the interstellar medium. We investigate the morphology of AME in the ?10º diameter ? Orionis ring by combining intensity data from the QUIJOTE experiment at 11, 13, 17, and 19 GHz and the C-Band All Sky Survey (C-BASS) at 4.76 GHz, together with 19 ancillary data sets between 1.42 and 3000 GHz. Maps of physical parameters at 1? resolution are produced through Markov chain Monte Carlo (MCMC) fits of spectral energy distributions (SEDs), approximating the AME component with a lognormal distribution. AME is detected in excess of 20 ? at degree-scales around the entirety of the ring along photodissociation regions (PDRs), with three primary bright regions containing dark clouds. A radial decrease is observed in the AME peak frequency from ? 35 GHz near the free-free region to ? 21 GHz in the outer regions of the ring, which is the first detection of AME spectral variations across a single region. A strong correlation between AME peak frequency, emission measure and dust temperature is an indication for the dependence of the AME peak frequency on the local radiation field. The AME amplitude normalized by the optical depth is also strongly correlated with the radiation field, giving an overall picture consistent with spinning dust where the local radiation field plays a key role.},
organization = {The QUIJOTE experiment is being developed by the Instituto de Astrofísica de Canarias (IAC), the Instituto de Física de Cantabria (IFCA), and the Universities of Cantabria, Manchester and Cambridge. The C-BASS project is a collaboration between Oxford and Manchester Universities in the UK, the California Institute of Technology in the U.S.A., Rhodes University, UKZN and the South African Radio Observatory in South Africa, and the King Abdulaziz City for Science and Technology (KACST) in Saudi Arabia. Partial financial support for QUIJOTE is provided by the Spanish Ministry of Economy and Competitiveness (MINECO) under the projects AYA2007-68058-C03-01, AYA2010-21766-C03-02, AYA2014-60438-P, AYA2017-84185-P, IACA13-3E-2336, IACA15-BE-3707, and EQC2018-004918-P; Agencia Estatal de Investigación (AEI) and Fondo Europeo de Desarrollo Regional (FEDER, UE), under projects ESP2017-83921-C2-1-R and AYA2017-90675-REDC; the European Union’s Horizon 2020 research and innovation programme under grant agreement number 687312 (RADIOFOREGROUNDS) and number 658499 (PolAME); Unidad de Excelencia María de Maeztu (MDM-2017-0765), and the Consolider-Ingenio project CSD2010-00064 (EPI: Exploring the Physics of Inflation). C-BASS has been supported by the NSF awards AST-0607857, AST-1010024, AST-1212217, and AST-1616227, and NASA award NNX15AF06G, the University of Oxford, the Royal Society, STFC, and the other participating institutions. C-BASS is also supported by the South African Radio Astronomy Observatory, which is a facility of the National Research Foundation, an agency of the Department of Science and Technology.},
publisher = {Oxford University Press},
publisher = {Monthly Notices of the Royal Astronomical Society, 2021, 503(2), 2927-2943},
title = {Detection of spectral variations of Anomalous Microwave Emission with QUIJOTE and C-BASS},
author = {Cepeda-Arroita, R. and Harper, S. E. and Dickinson, C. and Rubiño Martín, J. A. and Génova-Santos, R. T. and Taylor, Angela C. and Pearson, T. J. and Ashdown, M. and Barr, A. and Barreiro Vilas, Rita Belén and Casaponsa Galí, Biuse and Casas Reinares, Francisco Javier and Chiang, H. C. and Fernández Cobos, Raúl and Grumitt, R. D. P. and Guidi, F. and Heilgendorff, H. M. and Herranz Muñoz, Diego and Martínez González, Enrique and Vielva Martínez, Patricio},
}