Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-12-18
Astrophys.J.694:1413-1422,2009; Erratum-ibid.719:985,2010
Astronomy and Astrophysics
Astrophysics
12 pages, 4 figures, accepted for publication in The Astrophysical Journal
Scientific paper
10.1088/0004-637X/694/2/1413 10.
A four-dimensional statistical description of electromagnetic radiation is developed and applied to the analysis of radio pulsar polarization. The new formalism provides an elementary statistical explanation of the modal broadening phenomenon in single pulse observations. It is also used to argue that the degree of polarization of giant pulses has been poorly defined in past studies. Single and giant pulse polarimetry typically involves sources with large flux densities and observations with high time resolution, factors that necessitate consideration of source-intrinsic noise and small-number statistics. Self noise is shown to fully explain the excess polarization dispersion previously noted in single pulse observations of bright pulsars, obviating the need for additional randomly polarized radiation. Rather, these observations are more simply interpreted as an incoherent sum of covariant, orthogonal, partially polarized modes. Based on this premise, the four-dimensional covariance matrix of the Stokes parameters may be used to derive mode-separated pulse profiles without any assumptions about the intrinsic degrees of mode polarization. Finally, utilizing the small-number statistics of the Stokes parameters, it is established that the degree of polarization of an unresolved pulse is fundamentally undefined; therefore, previous claims of highly polarized giant pulses are unsubstantiated.
No associations
LandOfFree
The Statistics of Radio Astronomical Polarimetry: Bright Sources and High Time Resolution 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 The Statistics of Radio Astronomical Polarimetry: Bright Sources and High Time Resolution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Statistics of Radio Astronomical Polarimetry: Bright Sources and High Time Resolution will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-172757