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

Abstract: 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 uK Kbeam-1 for total intensity and 13-23 uK Kbeam-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 4.7 and W51 at 4.0 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 as = -0.67 ± 0.10 in W49 and as = -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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Tramonte D., Génova-Santos R.T., Rubiño-Martín J.A., Vielva P., Poidevin F., López-Caraballo C.H., Peel M.W., Ashdown M., Artal E., Barreiro R.B., Casas F.J., De La Hoz E., Fernández-Torreiro M., Guidi F., Herranz D., Hoyland R.J., Lasenby A.N., Martinez-Gonzalez E., Piccirillo L., Rebolo R., Ruiz-Granados B., Vansyngel F., Watson R.A.,

 Fuente: Monthly Notices of the Royal Astronomical Society, 2023, 519(3), 3432-3459

Editorial: Oxford University Press

 Fecha de publicación: 01/03/2023

Nº de páginas: 28

Tipo de publicación: Artículo de Revista

 DOI: 10.1093/mnras/stac3502

ISSN: 0035-8711,1365-2966

Proyecto español: AYA20AYA2007-68058-C03-01 ; AYA2007-68058-C03-02 ; AYA2010-21766-C03-01 ; AYA2010-21766-C03-02 ; AYA2014-60438-P ; ESP2015-70646-C2-1-R

Proyecto europeo: info:eu-repo/grantAgreement/EC/H2020/687312/EU/Ultimate modelling of Radio foregrounds: a key/RADIOFOREGROUNDS/

Url de la publicación: https://doi.org/10.1093/mnras/stac3502

Autores/as

TRAMONTE, DENIS

GÉNOVA SANTOS, RICARDO

JOSE ALBERTO RUBIÑO MARTIN

POIDEVIN, FRÉDÉRICK

LÓPEZ CARAVALLO, CARLOS HUGO

PEEL, MIKE

ASHDOWN, MARK

ELENA DE LA HOZ LOPEZ-COLLADO

FERNÁMDEZ TORREIRO, MATEO

GUIDI, FEDERICA

ROGER HOYLAND

LASENBY, ANTHONY

PICCIRILLO, LUCIO

RAFAEL REBOLO LOPEZ

BEATRIZ RUIZ GRANADOS

VANSYNGEL, FLAVIEN

WATSON, R.A.