QUIJOTE scientific results - V. The microwave intensity and polarization spectra of the Galactic regions W49, W51 and IC443

We present new intensity and polarization maps obtained with the QUIJOTE experiment towards the Galactic regions W49, W51 and IC443, covering the frequency range from 10 to 20-GHz at ⁓1deg angular resolution, with a sensitivity in the range 35-79 µK Kbeam-1 for total intensity and 13-23 µK beam-1 fo...

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Detalles Bibliográficos
Autores: Tramonte, Denis, Génova Santos, Ricardo Tanausú, Rubiño Martín, José Alberto, Vielva Martínez, Patricio|||0000-0003-0051-272X, Poidevin, Frédérick, López Caravallo, Carlos Hugo, Peel, Mike W., Ashdown, Mark, Artal Latorre, Eduardo|||0000-0002-2569-1894, Barreiro Vilas, Rita Belén|||0000-0002-6139-4272, Casas Reinares, Francisco Javier|||0000-0002-2217-5843, Hoz López-Collado, Elena de la, Fernámdez Torreiro, Mateo, Guidi, Federica, Herranz Muñoz, Diego|||0000-0003-4540-1417, Hoyland, Roger J., Lasenby, Anthony, Martínez González, Enrique, Piccirillo, L., Rebolo López, Rafael, Ruiz Granados, B., Vansyngel, F., Watson, R.A.
Tipo de recurso: artículo
Fecha de publicación:2023
País:España
Institución:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/30167
Acceso en línea:https://hdl.handle.net/10902/30167
Access Level:acceso abierto
Palabra clave:Radiation mechanisms: general
ISM: individual objects: W49, W51, IC443
Radio continuum: ISM
Descripción
Sumario:We present new intensity and polarization maps obtained with the QUIJOTE experiment towards the Galactic regions W49, W51 and IC443, covering the frequency range from 10 to 20-GHz at ⁓1deg angular resolution, with a sensitivity in the range 35-79 µK Kbeam-1 for total intensity and 13-23 µK beam-1 for polarization. For each region, we combine QUIJOTE maps with ancillary data at frequencies ranging from 0.4 to 3000 GHz, reconstruct the spectral energy distribution and model it with a combination of known foregrounds. We detect anomalous microwave emission (AME) in total intensity towards W49 at 4.7σ and W51 at 4.0σ with peak frequencies vAME=(20.0±1.4)GHz and vAME=(17.7±3.6)GHz, respectively; this is the first detection of AME towards W51. The contamination from ultracompact HII regions to the residual AME flux density is estimated at 10 per cent in W49 and 5 per cent in W51, and does not rule out the AME detection. The polarized SEDs reveal a synchrotron contribution with spectral indices αs = -0.67 ± 0.10 in W49 and αs = -0.51 ± 0.07 in W51, ascribed to the diffuse Galactic emission and to the local supernova remnant, respectively. Towards IC443 in total intensity we measure a broken power-law synchrotron spectrum with cut-off frequency v0,s=(114±73)GHz, in agreement with previous studies; our analysis, however, rules out any AME contribution which had been previously claimed towards IC443. No evidence of polarized AME emission is detected in this study.

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