Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-02-24
Astronomy and Astrophysics
Astrophysics
6 pages, 5 figures. to appear in S.Cecchini et al., Astrophysical Polarized Backgrounds, AIP Conf. Proceedings
Scientific paper
10.1063/1.1471823
The polarized diffuse Galactic radio emission, mainly synchrotron emission, is expected to be one of the most relevant source of astrophysical contamination at low and moderate multipoles in cosmic microwave background polarization anisotropy experiments at frequencies lower then 50 to 100 GHz. We present here preliminary results based on a recent analysis of the Leiden surveys covering about 50% of the sky at low as well as at middle and high Galactic latitudes. By implementing specific interpolation methods to deal with these data, which show a large variation of the sampling across the sky, we produce maps of the polarized diffuse Galactic synchrotron component at frequencies between 408 and 1411 MHz with pixel sizes larger or equal to about 0.92 degrees. We derive the angular power spectrum of this component for the whole covered region and for three patches in the sky significantly oversampled with respect to the average and at different Galactic latitudes. We find multipole spectral indices typically ranging between about -3 and about -1, according to the considered frequency and sky region. At frequencies higher or equal to 610 MHz, the frequency spectral indices observed in the considered sky regions are about -3.5, compatible with an intrinsic frequency spectral index of about -5.8 and a depolarization due to Faraday rotation with a rotation measure RM of about 15 radians per square meter. This implies that the observed angular power spectrum of the polarized signal is about 85% or 20% of the intrinsic one at 1411 MHz or 820 MHz respectively.
Burigana Carlo
Porta Laura La
No associations
LandOfFree
A Multifrequency Analysis of the Polarized Diffuse Galactic Radio Emission at Degree Scales does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Multifrequency Analysis of the Polarized Diffuse Galactic Radio Emission at Degree Scales, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Multifrequency Analysis of the Polarized Diffuse Galactic Radio Emission at Degree Scales will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-454675