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QUIJOTE scientific results - II. Polarisation measurements of the microwave emission in the Galactic molecular complexes W43 and W47 and supernova remnant W44

Abstract: We present Q-U-I JOint TEnerife (QUIJOTE) intensity and polarisation maps at 10?20 GHz covering a region along the Galactic plane 24° ? l ? 45°, |b| ? 8°. These maps result from 210 h of data, have a sensitivity in polarisation of ?40 ?K beam?1 and an angular resolution of ?1°. Our intensity data are crucial to confirm the presence of anomalous microwave emission (AME) towards the two molecular complexes W43 (22?) and W47 (8?). We also detect at high significance (6?) AME associated with W44, the first clear detection of this emission towards a supernova remnant. The new QUIJOTE polarisation data, in combination with Wilkinson Microwave Anisotropy Probe (WMAP), are essential to (i) determine the spectral index of the synchrotron emission in W44, ?sync = ?0.62 ± 0.03, in good agreement with the value inferred from the intensity spectrum once a free?free component is included in the fit; (ii) trace the change in the polarisation angle associated with Faraday rotation in the direction of W44 with rotation measure ?404 ± 49 rad m?2 and (iii) set upper limits on the polarisation of W43 of ?AME < 0.39 per cent (95 per cent C.L.) from QUIJOTE 17 GHz, and <0.22 per cent from WMAP 41 GHz data, which are the most stringent constraints ever obtained on the polarisation fraction of the AME. For typical physical conditions (grain temperature and magnetic field strengths), and in the case of perfect alignment between the grains and the magnetic field, the models of electric or magnetic dipole emissions predict higher polarisation fractions.

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

 Fuente: Monthly notices of the Royal Astronomical Society, 2017, 464(4), 4107-4132

Editorial: Oxford University Press

 Fecha de publicación: 01/02/2017

Nº de páginas: 26

Tipo de publicación: Artículo de Revista

 DOI: 10.1093/mnras/stw2503

ISSN: 0035-8711,1365-2966

 Proyecto español: AYA2007-68058-C03-01 ; AYA2010-21766-C03-02 ; AYA2012-39475-C02-01 ; CSD2010-00064

Url de la publicación: https://doi.org/10.1093/mnras/stw2503

Autoría

GÉNOVA SANTOS, RICARDO

JOSE ALBERTO RUBIÑO MARTIN

PELÁEZ SANTOS, ALBA EVA

POIDEVIN, FRÉDÉRICK

RAFAEL REBOLO LOPEZ

VIGNAGA, RICARDO

ROGER HOYLAND

LASENBY, A.

PICCIRILLO, L.

TRAMONTE, DENIS

WATSON, RICHARD A.