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First Detection of Spectral Variations of Anomalous Microwave Emission with QUIJOTE and C-BASS

Cepeda-Arroita, R. and Harper, S. and Dickinson, C. and Rubino-Martin, J. A. and Génova-Santos, R. T. and Taylor, Angela C. and Pearson, T. J. and Ashdown, M. and Barr, A. and Barreiro, R. B. and Casaponsa, B. and Casas, F. J. and Chiang, H. C. and Fernandez-Cobos, R. and Grumitt, R. D. P. and Guidi, F. and Heilgendorff, H. M. and Herranz, D. and Jew, L. R. P. and Jonas, J. L. and Jones, Michael E. and Lasenby, A. and Leech, J. and Leahy, J. P. and Martínez-González, E. and Peel, M. W. and Poidevin, F. and Piccirillo, L. and Readhead, A. C. S. and Rebolo, R. and Ruiz-Granados, B. and Sievers, J. and Vansyngel, F. and Vielva, P. and Watson, R. A. (2020) First Detection of Spectral Variations of Anomalous Microwave Emission with QUIJOTE and C-BASS. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20210202-095259075

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Abstract

Anomalous Microwave Emission (AME) is a significant component of Galactic diffuse emission in the frequency range 10-60GHz and a new window into the properties of sub-nanometre-sized grains in the interstellar medium. We investigate the morphology of AME in the ≈10∘ diameter λ Orionis ring by combining intensity data from the QUIJOTE experiment at 11, 13, 17 and 19GHz and the C-Band All Sky Survey (C-BASS) at 4.76GHz, together with 19 ancillary datasets between 1.42 and 3000GHz. 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 log-normal distribution. AME is detected in excess of 20σ 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 ≈35GHz near the free-free region to ≈21GHz 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 normalised 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.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/2001.07159arXivDiscussion Paper
ORCID:
AuthorORCID
Cepeda-Arroita, R.0000-0002-9043-2645
Dickinson, C.0000-0002-0045-442X
Rubino-Martin, J. A.0000-0001-5289-3021
Pearson, T. J.0000-0001-5213-6231
Barreiro, R. B.0000-0002-6139-4272
Grumitt, R. D. P.0000-0001-9578-6111
Jones, Michael E.0000-0003-3564-6680
Peel, M. W.0000-0003-3412-2586
Readhead, A. C. S.0000-0001-9152-961X
Rebolo, R.0000-0003-3767-7085
Sievers, J.0000-0001-6903-5074
Additional Information: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. RCA would like to thank Aaron Bell, Takashi Onaka and the AKARI collaboration for providing access to the AKARI 9 μm data in the region. We make use of the HEALPix package (Górski et al. 2005) and Python astropy, corner, emcee, healpy, matplotlib, numpy and scipy packages. RCA acknowledges support from an STFC postgraduate studentship and a President's Doctoral Scholar Award from the University of Manchester. FP acknowledges support from the Spanish Ministerio de Economía y Competitividad (MINECO) under grant numbers ESP2015-65597-C4-4-R, ESP2017-86852-C4-2-R, ESP2015-65597-C4-4-R and ESP2017-86852-C4-2-R.
Group:Astronomy Department
Funders:
Funding AgencyGrant Number
Ministerio de Economía, Industria y Competitividad (MINECO)AYA2007-68058-C03-01
Ministerio de Economía, Industria y Competitividad (MINECO)AYA2010-21766-C03-02
Ministerio de Economía, Industria y Competitividad (MINECO)AYA2014-60438-P
Ministerio de Economía, Industria y Competitividad (MINECO)AYA2017-84185-P
Ministerio de Economía, Industria y Competitividad (MINECO)IACA13-3E-2336
Ministerio de Economía, Industria y Competitividad (MINECO)IACA15-BE-3707
Ministerio de Economía, Industria y Competitividad (MINECO)EQC2018-004918-P
Agencia Estatal de InvestigaciónESP2017-83921-C2-1-R
Fondo Europeo de Desarrollo Regional (FEDER)UNSPECIFIED
Agencia Estatal de InvestigaciónAYA2017-90675-REDC
European Research Council (ERC)687312
Marie Curie Fellowship658499
Unidad de Excelencia María de MaeztuMDM-2017-0765
Ministerio de Economía, Industria y Competitividad (MINECO)CSD2010-00064
NSFAST-0607857
NSFAST-1010024
NSFAST-1212217
NSFAST-1616227
NASANNX15AF06G
University of OxfordUNSPECIFIED
Royal SocietyUNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
South African Radio Astronomy ObservatoryUNSPECIFIED
National Research Foundation (South Africa)UNSPECIFIED
Department of Science and Technology (South Africa)UNSPECIFIED
University of ManchesterUNSPECIFIED
Ministerio de Economía, Industria y Competitividad (MINECO)ESP2015-65597-C4-4-R
Ministerio de Economía, Industria y Competitividad (MINECO)ESP2017-86852-C4-2-R
Ministerio de Economía, Industria y Competitividad (MINECO)ESP2015-65597-C4-4-R
Ministerio de Economía, Industria y Competitividad (MINECO)ESP2017-86852-C4-2-R
Subject Keywords:surveys - radiation mechanism: non-thermal - radiation mechanism: thermal - diffuse radiation - radio continuum: ISM
Record Number:CaltechAUTHORS:20210202-095259075
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210202-095259075
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107864
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:03 Feb 2021 20:18
Last Modified:03 Feb 2021 20:18

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