Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-02-04
Astrophys.J.711:417-423,2010
Astronomy and Astrophysics
Astrophysics
Scientific paper
10.1088/0004-637X/711/1/417
Whithin the framework of the Planck satellite polarisation calibration, we present a study of the Crab Nebula spectral energy distribution (SED) over more than 6 decades in frequency ranging from 1 to $\rm 10^6 GHz$. The Planck satellite mission observes the sky from 30 to 857 GHz and therefore we focus on the millimetre region. We use radio and submillimetre data from the WMAP satellite between 23 and 94 GHz (from 13 to 3.18 mm) and from the Archeops balloon experiment between 143 (2.1 mm) and 545 GHz (0.55 mm), and a compendium of other Crab Nebula observations. The Crab SED is compared to models including three main components : synchrotron which is responsible for the emission at low and at high frequencies, dust which explains the excess of flux observed by the IRAS satellite and an extra component on the millimetre regime. From this analysis we conclude that the unpolarised emission of the Crab Nebula at microwave and millimetre wavelengths is the same synchrotron emission that the one observed in the radio domain. Therefore, we expect the millimetre emission of the Crab nebula to be polarised with the same degree of polarisation and orientation than the radio emission. We set upper limits on the possible errors induced by any millimetre extra component on the reconstruction of the degree and angle of polarisation at the percent level as a maximum. This result strongly supports the choice by the Planck collaboration of the Crab nebula emission for performing polarisation cross-checks in the range 30 (299 mm) to 353 GHz (0.849 mm).
Aumont J.
Desert François Xavier
Macías-Pérez Juan Francisco
Mayet F.
No associations
LandOfFree
Global spectral energy distribution of the Crab Nebula in the prospect of the Planck satellite polarisation calibration 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 Global spectral energy distribution of the Crab Nebula in the prospect of the Planck satellite polarisation calibration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Global spectral energy distribution of the Crab Nebula in the prospect of the Planck satellite polarisation calibration will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-237311